United States Region III Monitoring and
Environmental Chesapeake Bay Analysis
Protection Agency Program Office Subcommittee
Tidal Monitoring EPA 903-R-04-008
and Analysis CBP/TRS 268/04
Workgroup October 2004
Chesapeake Bay Program
A Watershed Partnership
Chesapeake Bay Program
Analytical Segmentation
Scheme
Revisions, Decisions and Rationales
1983-2003
October 2004
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Chesapeake Bay Program
Analytical Segmentation Scheme
Revisions, Decisions and Rationales
1983-2003
Prepared by the
Chesapeake Bay Program
Monitoring and Analysis Subcommittee
Tidal Monitoring and Analysis Workgroup
Annapolis, Maryland
October 2004
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Contents
Executive Summary v
Acknowledgments xi
I. Introduction 1
II. 1983 Segmentation Scheme 3
Literature Cited 5
III. 1997-1998 Segmentation Scheme 7
Factors Considered in the Revision Process 8
Salinity 8
Natural geographic partitions and features 8
Original segmentation boundaries 11
Segmentation Scheme Revision Process 11
1997 Interim segmentation scheme 11
1998 Segmentation scheme 11
Tidal monitoring station names 12
1997-1998 Segmentation Revision Decisions in Detail 12
IV. 2003 Segmentation Scheme 19
Sub-segments for State Water Quality Standards Applications ... 21
Maryland's split segments for shallow water
bay grass designated use 21
Virginia's upper James River split segment 22
Literature Cited 22
V. Information Related to the Segmentation Schemes 25
Monitoring Stations and Past/Present Segmentation Schemes .... 25
2003 Segmentation Statistics 26
Segment Boundary Coordinates 29
Web Access to Segmentation Schemes 29
Contents
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IV
Appendix A
Water Quality Monitoring in Relationship to Past and Present
Chesapeake Bay Program Segmentation Schemes 31
Appendix B
Maryland's and Virginia's Chesapeake Bay
Program Split Segments Boundary Delineations 49
Appendix C
2003 Chesapeake Bay Program Segmentation Scheme
Coordinates Geo-reference and Narrative Descriptions 53
Contents
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Executive Summary
For the last 20 years, the Chesapeake Bay Program partners have used various forms
of a basic segmentation scheme to organize the collection, analysis and presentation
of environmental data. The Chesapeake Bay Program Segmentation Scheme
Revisions, decisions, and rationales: 1983-2003 (Segmentation Scheme Report)
provides documentation on the development of the spatial segmentation scheme of
the Chesapeake Bay and its tidal tributaries and the later revisions and changes over
the last 20 years. It contains information on the 1983-1985 original segmentation,
the 1997-1998 revisions for the 1997 Re-evaluation, and the 2003 segmentation
corrections and expansion. This document provides a concise summary on the
segmentation scheme background and a listing of the principal contents of the larger
segmentation document related to tidal water designated uses.1
NEED FOR A SEGMENTATION SCHEME
Segmentation is the compartmentalizing of the estuary into subunits based on selected
criteria. The Chesapeake Bay ecosystem is diverse and complex, and the physical and
chemical factors which vary throughout the Bay determine the biological communi-
ties and affect the kind and extent of their response to pollution stress. These same
factors also influence their response to restoration and remediation. For diagnosing
anthropogenic impacts, segmentation is a way to group regions having similar natural
characteristics, so that differences in water quality and biological communities among
similar segments can be identified and their source elucidated. For management
purposes, segmentation is a way to group similar regions to define a range of water
quality and resource objectives, target specific actions and monitor response. It
provides a meaningful way to summarize and present information in parallel with
these objectives, and it is a useful geographic pointer for data management.
1-Tlie entire Chesapeake Bay Program Segmentation Scheme document can be viewed and downloaded
at http://www.chesapeakebay.net/pubs/segmentscheme.pdf.
Executive Summary
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VI
1983-1985 SEGMENTATION SCHEME
The original Chesapeake Bay Segmentation Scheme, published in the appendices of
Chesapeake Bay: A Profile of Environmental Change, was developed in the late
1970s and early 1980s. This initial segmentation scheme formed the spatial aggre-
gation scheme for station network design of the baywide water quality and biological
monitoring programs that were initiated in the mid-1980s.
The 1983-1985 scheme was based primarily on salinity, circulation and natural
features, and secondarily on biological factors and management objectives. The
salinity data record on which the scheme was based extends to the late 1940s, but for
many parts of the Chesapeake Bay, the data were at best patchy in time and space,
and at worst, nonexistent.
1997-1998 REVISED SEGMENTATION SCHEME
Early in 1997, in preparation for tributary basin analyses in support of the 1997
Nutrient Reduction Re-evaluation, members of the Chesapeake Bay Program Moni-
toring Subcommittee's Data Analysis Workgroup proposed the existing
segmentation scheme be revised to facilitate better linkages between water quality
and living resources. Since distribution and abundance of plankton, submerged
aquatic vegetation (SAV) and most other estuarine communities are strongly
dependent on salinity, the spatial aggregation of plankton, SAV and water quality
data for the Re-evaluation was to be based on salinity regimes. Water quality
analyses for the Re-evaluation focused on changes occurring during the 12-year
period 1985 to 1996, a period dominated in later years by higher than normal flows,
causing relatively large shifts in salinity zone boundaries. The salinity zones were
defined as tidal fresh (0-0.5 ppt), oligohaline (>0.5-5 ppt), mesohaline (>5-18 ppt)
and polyhaline (greater than 18 ppt).
In the 1983 segmentation scheme, many segments contained stations with widely
differing salinity characteristics. Some segments aggregated stations and waters with
seemingly disparate influences. Other needs for modification were identified e.g.,
correcting earlier station misassignments and modifying segment boundaries to
account for near shore characteristics impacting SAV assessments. The 1997
Nutrient Reduction Re-evaluation provided an opportunity to make these revisions.
However, not all of the planned work was completed by the time the re-evaluation
analyses had to be undertaken, so those data analyses used the interim segmentation
scheme as it then existed in 1997. Further work on revising the segmentation scheme
was then picked up again in 1998 and brought to a state of closure in 2003.
2003 SEGMENTATION SCHEME REFINEMENTS
Between 1998 and 2003, a few inadvertent errors in station coordinates and segment
lines had been discovered and corrected. For the most part, the changes were small
and undetectable at the scale of the figures in the referenced segmentation scheme
Executive Summary
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VII
document. However, discrepancies might show up as small differences in volume,
area or perimeter citations for affected segments. The segmentation scheme was
expanded in the Potomac River to incorporate additional below-fall line stations in
the Potomac and Anacostia rivers. In addition, a new segment was created for the
Anacostia River (ANATF), and in the Elizabeth River, segment ELIMH was rede-
fined as polyhaline and joined with segment ELIPH. The details of all these changes
are given in the complete document.
The Segmentation Scheme Report contains the following maps and tables used to
document changes to the segmentation scheme from 1983 through 2003 and
provides the jurisdictions with detailed documentation on the geographical delin-
eation of each segment's boundaries:
Maps for the 1983, 1997, 1998 and 2003 segmentation schemes;
Statistics on the perimeter, surface and volume of each Chesapeake Bay
Program segment;
Narrative descriptions of each of the coordinates bounding each Chesapeake
Bay Program segment;
Maps of all the Chesapeake Bay Water Quality monitoring program stations
displayed by segment for Maryland, Virginia and the District of Columbia;
and,
Maps and table describing Maryland's split segments for application of the
shallow-water bay grass designated use and Virginia's upper James River
split segment.
Executive Summary
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VIII
NORTF
CB1TF
8SHOH-
GUNOH-
MIDOH^
BACOHx
-ELKOH
C&DOH
BOHOH
SASOH
AfJATF
POTOH
JMSTF.
APPTF
PATM
MAGMH
SEVMH
SOUMH
RHDMH
WSTWIH
MOBPH
CB8PH
ELIPH
W8EMH
SBEMH
2003 Chesapeake Bay Segmentation Scheme
Source: Chesapeake Bay Program.
Executive Summary
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IX
2003 Chesapeake Bay Program Segment Names and Codes
Northern Chesapeake Bay CB1TF
Upper Chesapeake Bay CB2OH
Upper Central Chesapeake Bay CB3MH
Middle Central Chesapeake Bay ... CB4MH
Lower Central Chesapeake Bay .... CB5MH
Western Lower Chesapeake Bay .... CB6PH
Eastern Lower Chesapeake Bay .... CB7PH
Mouth of Chesapeake Bay CB8PH
Bush River BSHOH
Gunpowder River GUNOH
Middle River MIDOH
Back River BACOH
Patapsco River PATMH
Magothy River MAGMH
Severn River SEVMH
South River SOUMH
Rhode River RHDMH
West River WSTMH
Upper Patuxent River PAXTF
Western Branch Patuxent River WBRTF
Middle Patuxent River PAXOH
Lower Patuxent River PAXMH
Upper Potomac River POTTF
Anacostia River ANATF
Piscataway Creek PISTF
Mattawoman Creek MATTF
Middle Potomac POTOH
Lower Potomac POTMH
Upper Rappahannock River RPPTF
Middle Rappahannock River RPPOH
Lower Rappahannock River RPPMH
Corrotoman River CRRMH
Piankatank River PIAMH
Upper Mattaponi River MPNTF
Lower Mattaponi River MPNOH
Upper Pamunkey River PMKTF
Lower Pamunkey River PMKOH
Middle York River YRKMH
Lower York River YRKPH
Mobjack Bay MOBPH
Upper James River JMSTF
Appomattox River APPTF
Middle James River JMSOH
Chickahominy River CHKOH
Lower James River JMSMH
Mouth of the James River JMSPH
Western Branch Elizabeth River . . . WBEMH
Southern Branch Elizabeth River . . . SBEMH
Eastern Branch Elizabeth River .... EBEMH
Lafayette River LAFMH
Mouth to mid-Elizabeth River ELIPH
Lynnhaven River LYNPH
Northeast River NORTF
C&D Canal C&DOH
Bohemia River BOHOH
Elk River ELKOH
Sassafras River SASOH
Upper Chester River CHSTF
Middle Chester River CHSOH
Lower Chester River CHSMH
Eastern Bay EASMH
Upper Choptank River CHOTF
Middle Choptank River CHOOH
Lower Choptank River CHOMH1
Mouth of the Choptank River CHOMH2
Little Choptank River LCHMH
Honga River HNGMH
Fishing Bay FSBMH
Upper Nanticoke River NANTF
Middle Nanticoke River NANOH
Lower Nanticoke River NANMH
Wicomico River WICMH
Manokin River MANMH
Big Annemessex River BIGMH
Upper Pocomoke River POCTF
Middle Pocomoke River POCOH
Lower Pocomoke River POCMH
Tangier Sound TANMH
Source: Chesapeake Bay Program.
Executive Summary
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XI
Acknowledgments
The ad hoc team to draft the 1997 re-evaluation segmentation scheme consisted of
Peter Bergstrom, then of U.S. Fish and Wildlife Service, now at NOAA Chesapeake
Bay Office; Rick Hoffman, Virginia Department of Environmental Quality; Bruce
Michael, Maryland Department of Natural Resources; and Marcia Olson, NOAA
Chesapeake Bay Office. The Box and Whisker plots of salinity for each monitoring
station were created by Dr. Elgin Perry, statistical consultant. Paula Jasinski,
formerly a member of the Chesapeake Bay Program Office GIS team and currently
with the NOAA Chesapeake Bay Office, created the isopleth maps and GIS
coverage, fielded and summarized the review comments. She was assisted with the
GIS coverage by Dave Wilcox, Virginia Institute of Marine Science.
The 2003 revisions were made by the Chesapeake Bay Program Office GIS team of
Howard Weinberg, University of Maryland Center for Environmental Studies, who
provided the segment textual description, GIS segment revisions and text and maps
for sub-segments for state water quality standard applications; Andy Fitch, Univer-
sity of Maryland Center for Environmental Studies, who created the station maps;
and Patrick Nowlan, National Park Service, who worked on the creation of new
bathymetry segment files for the Chesapeake Bay Program Volumetric Interpolator.
Marcia Olson, NOAA Chesapeake Bay Office, updated the 1998 version adding text
to link the early versions to the 2003 updates, and Ricky Bahner, Interstate Commis-
sion on the Potomac River Basin, edited the tables and worked with the GIS team to
update the station maps.
Acknowledgments
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chapter |
Introduction
The Chesapeake Bay Program spatial segmentation scheme has evolved over the
past two decades as management needs have changed and new analytical applica-
tions have been built upon old ones. At the same time, data management and
processing technology and spatial analytical tools associated with the segmentation
scheme also have been rapidly evolving. Evolution and change are good, but the
process can leave behind errors, inconsistencies and apparently illogical situations
that are artifacts of earlier versions or mistakes in the process. This report documents
the changes to the segmentation scheme over the past 20 years, the reasons behind
the changes, the known errors and lingering artifacts.
Segmentation is the compartmentalizing of the estuary into subunits based on
selected criteria. The Chesapeake Bay ecosystem is diverse and complex, and the
physical and chemical factors that vary throughout the Bay determine the biological
communities and affect the kind and extent of their response to pollution stress.
These same factors also influence their response to remediation actions and restora-
tion. In order to diagnose anthropogenic impacts, segmentation is a way to group
regions having similar natural characteristics, so that differences in water quality and
biological communities among similar segments can be identified and common
stressors and responses elucidated. For management purposes, segmentation is a way
to group similar regions to define a range of water quality and resource objectives,
target specific actions, and monitor response. It provides a meaningful way to
summarize and present information in parallel with these objectives, and it is a useful
geographic pointer for management of data and information.
chapter i Introduction
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chapter||
1983 Segmentation Scheme
The original 1983 Chesapeake Bay segmentation scheme (Figure 1) was adapted
from Klein (unpublished) and described in the Appendices of the EPA report, Chesa-
peake Bay: A Profile of Environmental Change (Flemer et al. 1983). Originally
designed for the purpose of water quality assessment, the system was based prima-
rily on geomorphology, circulation, and salinity, and secondarily on biological
factors and management objectives. The 45 segments were grouped according to five
categories: tidal-fresh reaches, transition zones, lower estuarine reaches, lower main
bay, and embayments. The salinity data record on which the scheme was based
extended back to the late 1940s, but for many parts of the Bay, the data were at best
patchy in time and space, and at worst, nonexistent. In any case, segment boundaries
were based on the longest available record to take into account as much as possible
the up- and downstream shifts of the salt wedge. Boundaries and principal segment
characteristics were clearly defined for each segment.
The 1983 segmentation scheme was used in the analyses to assess the state of the
Chesapeake Bay in the late 1970s and early 1980s setting the future course for the
Chesapeake Bay Program that was being formed. It played a central role in the tidal
water quality and biological monitoring station network design (Appendix A), data
analysis and interpretation. The system, introduced in 1983, was based on the analysis
of historic data, and remained in use until the 1997 Re-evaluation analysis revisions.
A description of the 1983 segmentation scheme along with maps and defining
latitude/longitude coordinates was published as a separate reference document,
The Chesapeake Bay Segmentation Scheme (Chesapeake Bay Program 1990).2
2In the current Chesapeake Information Management System (CIMS) geographic information system
(GIS) database and the Chesapeake Bay Program website-accessible tables, the original scheme is
referred to as CBSeg_1985
chapter ii 1983 Segmentation Scheme
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ET1
N
+
0 5 10 20 30 40
Figure 1. Original 1983 Chesapeake Bay Program segmentation scheme.
Source: Flemer et al. 1983.
chapter ii 1983 Segmentation Scheme
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LITERATURE CITED
Chesapeake Bay Program. 1990. The Chesapeake Bay Segmentation Scheme, Chesa-
peake Bay Program. CBP/TRS 38/90. U.S. Environmental Protection Agency
Chesapeake Bay Program Office, Annapolis, Maryland.
Flemer, D. A., G. B. Mackiernan, W. Nehlsen, V. K. Tippie, R. B. Biggs, D. Blay-
lock, N. H. Burger, L. C. Davidson, D. Haberman, K. S. Price and J. L. Taft. 1983.
Chesapeake Bay: A Profile of Environmental Change Appendices in Chesapeake
Bay: A Profile of Environmental Change. E. G. Macalaster, D. A. Barker and M. E.
Kasper, eds. U.S. Environmental Protection Agency Chesapeake Bay Program
Office. Washington, D.C. 120 pp. and Appendices.
Klein, C. J. 1981. Chesapeake Bay Program segmentation approach. Unpublished
Chesapeake Bay Program working paper. 21pp.
chapter ii 1983 Segmentation
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chapter|||
1997-1998 Segmentation Scheme
The Chesapeake Bay and tidal tributaries are estuaries offering brackish water habi-
tats of varying salinity and other chemical characteristics. Most aquatic organisms
have an optimum salinity concentration in which they thrive and a range of salinity
concentrations they tolerate that govern their seasonal and spatial abundance and
distribution. In order to conduct meaningful analyses, species with similar habitat
requirements and locations with similar water quality characteristics should be
grouped together. Salinity must therefore be a major factor in any segmentation
scheme that aggregates data for analysis.
Early in 1997, in preparation for basin-wide analyses in support of the 1997 Nutrient
Reduction Re-evaluation, members of the Chesapeake Bay Program Monitoring
Subcommittee Data Analysis Workgroup proposed that the existing 1983 segmenta-
tion scheme be revised to facilitate better linkages between water quality and living
resources. Water quality analyses for the re-evaluation focused on changes occurring
during the 12-year period from 1985 to 1996, which was dominated in later years by
higher-than-normal flows, causing relatively large shifts in salinity zone boundaries.
Many segments then contained stations with widely differing salinity characteristics.
In addition, some segments such as WT8 that included the South, Rhode and West
rivers, and EE2 that included the lower Choptank and the embayment at the mouth
of the Little Choptank, aggregated stations and waters with seemingly disparate
influences (Figure 1). The authors of the original segmentation scheme acknowl-
edged the need for additional data and refinement of the boundaries. Other
modifications were also needed, for example, correcting earlier station mis-assign-
ments and modifying segment boundaries to account for near-shore characteristics
impacting SAV assessments. The revision of the original 1983 segmentation scheme
called for in support of the nutrient reduction re-evaluation, provided an opportunity
to make these modifications.
However, not all of the planned work was completed by the time the re-evaluation
analyses had to be undertaken. For example, the branches to the Elizabeth River
were still grouped as one polyhaline segment (WT10PH), SAV beds had not been
chapter iii 1997-1998 Segmentation Scheme
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adequately accounted for in the Tangier Sound, and there were three segments
containing mesohaline waters in the Rappahannock River, which was inconsistent
with decisions made in other tidal tributaries. The re-evaluation analyses used the
interim segmentation scheme as it then existed in 1997 (Figure 2), with the further
revisions to the segmentation scheme completed in 1998 (Figure 3) until the review
and expansion undertaken in 2003.
FACTORS CONSIDERED IN THE REVISION PROCESS
An ad hoc committee (see Acknowledgments) was formed from the Chesapeake Bay
Program Monitoring Subcommittee's Data Analysis Workgroup membership to draft
a revised scheme. The committee based the new scheme on a hierarchy of consider-
ations: salinity, natural geographic partitions and features and original segmentation
boundaries.
SALINITY
Salinity was the primary criterion driving revisions to the original 1983 segmenta-
tion scheme. The revised segmentation scheme recognized four salinity categories or
regimes:
Tidal fresh (TF): 0-0.5 ppt;
Oligohaline (OH): >0.5-5 ppt;
Mesohaline (MH): >5-18 ppt; and
Polyhaline (PH): >18ppt.
The objective of the revision was to create segments containing tidal monitoring
stations of like salinity characteristics.
NATURAL GEOGRAPHIC PARTITIONS AND FEATURES
The major tidal tributaries were separated from the mainstem Chesapeake Bay at the
mouth, with segment lines formed by connecting terminal land extensions on either
side of the river. In the course of the revision process, the ad hoc committee learned
that the U.S. Geological Survey (USGS) was in the process of redefining river mouth
boundaries for the National Hydrographic Delineation Project and investigated the
utility of co-locating the Chesapeake Bay Program river mouth segment lines with
the USGS delineations. The ad hoc committee ultimately decided against this, since
the USGS river mouth delineations were set without rules and did not fully match
with the Chesapeake Bay Program segmentation scheme's objectives. With some
exceptions, the ad hoc committee decided to preserve the original river mouth
segment lines.
In the original 1983 segmentation scheme, some small tidal tributaries and isolated
tidal water areas with monitoring stations were grouped with nearby segments. In the
chapter iii 1997-1998 Segmentation Scheme
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Figure 2. 1997 Chesapeake Bay Program segmentation scheme.
Source: Chesapeake Bay Program.
chapter iii 1997-1998 Segmentation Scheme
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10
Figure 3. 1998 Chesapeake Bay Program segmentation scheme.
Source: Chesapeake Bay Program.
chapter iii 1997-1998 Segmentation Scheme
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11
revised segmentation scheme, these tidal water areas were partitioned into individual
segments. Segment lines near the mid-Bay islands (e.g., Bloodsworth, Smith and
Tangier) were revised based on their surrounding shallow-water habitat with
submerged aquatic vegetation (SAV) assessments in mind. Finally, bathymetry and
circulation patterns influenced small shifts in boundary lines in segments CB7 and
CBS in the mainstem Bay.
ORIGINAL SEGMENTATION BOUNDARIES
The original 1983 segmentation scheme boundaries were preserved where the above
described considerations were met and there was no other compelling reason to
change.
SEGMENTATION SCHEME REVISION PROCESS
1997 INTERIM SEGMENTATION SCHEME
The first step was to determine salinity characteristics of each of the over 150 tidal
water quality monitoring stations. Box and whisker plots showing summary statis-
tics for surface and bottom salinity at each station over the 12-year (1985-1996)
period were created. On the advice of the Data Analysis Workgroup, each station was
assigned to one of the four salinity regimes previously described based on the 12-
year grand mean of the monthly mean surface salinities. The station's surface grand
mean was the primary criterion; bottom grand mean salinity was used in borderline
decisions.
By the spring of 1997, a preliminary segmentation scheme was in place with station
assignments completed and temporary segment boundary lines drawn midway
between stations in different salinity regimes. Segment names, which were varia-
tions of original segment names, were still temporary. Most, if not all, of the
station-based analyses for the 1997 re-evaluation were done using the segment
assignments in place at this stage of the revision process (Figure 2).
1998 SEGMENTATION SCHEME
Later in 1997, to establish more formal salinity-based segment lines, a map of
0.5 ppt salinity isopleths was created using Arc/INFOฎ interpolation software and
the mean monthly surface salinity point data. Segment lines were redrawn at the
isopleth breaks using the salinity classifications described above. The break lines and
guidance from the ad hoc committee were used to draft a new segmentation
coverage. The salinity plots and GIS maps were then reviewed by the Chesapeake
Bay Program Monitoring and Living Resources subcommittees, especially the SAV
Workgroup and scientific investigators researching the bottom dwelling benthic
community. Suggestions for modifications were submitted to the ad hoc committee
for review. Those decisions are part of this document.
chapter iii 1997-1998 Segmentation Scheme
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12
By 1998, the segmentation scheme boundary lines were fixed and a new segment
naming convention was adopted. In the new segment renaming convention, the first
three spaces reflect the tributary name, spaces four and five are the abbreviation of
the salinity zone (TF, OH, MH or PH), and a sixth space is reserved for subdivisions
of the salinity zone. For example, the mesohaline region of the Choptank River has
two segmentsCHOMH1 and CHOMH2with the numbers increasing in
sequence up-bay and up-river.
TIDAL MONITORING STATION NAMES
A consequence of revising the segmentation scheme and segment-naming conven-
tion was the 'orphaning' of the station names. Most of the stations in the tidal water
quality and biological monitoring programs had names indicating the original
Chesapeake Bay Program segment and their relational location within the segment.
There was an effort to explore the possibilities and consequences of changing the
station names either to better coincide with the new segmentation scheme or to
decouple the naming convention from the segment scheme altogether. In the end, the
ad hoc committee decided that it could not devise a naming convention that better
met the needs and limitations of the data collectors, data base managers, analysts and
historians. Thus, existing stations retain their Chesapeake Bay Program name or
other original name, if desired (see Appendix A Table A-l), and there are no rules
for the naming of new sampling locations.
1997-1998 SEGMENTATION REVISION
DECISIONS IN DETAIL
The segmentation revision recommendations and some of the decision rationales are
described below. Old segment and station names are the primary reference with the
new segment assignment indicated in the text. The tidal monitoring station table
(Appendix A Table A-l) includes the original Chesapeake Bay Program segment
assignment and subsequent updates.
Segment ET1: Northeast River. The segment name was changed to NORTF with no
changes to the boundary.
Segment ET2: C & D Canal, Elk River and Bohemia River. This original segment
contained three oligohaline tidal water quality monitoring stations: one each in the
C & D canal, the upper Elk River and the Bohemia River. The original segment was
subdivided into three separate segments, each containing a monitoring station. A
new segment, C&DOH, was formed with a boundary at the entrance to the C & D
canal. A new segment, BOHOH, was formed with a boundary at the mouth of the
Bohemia River where it joins the Elk River. A new segment, ELKOH, was formed
containing the mainstem of the Elk River using the original segment line where the
Elk River meets the mainstem Chesapeake Bay.
chapter iii 1997-1998 Segmentation Scheme
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13
Segment ET3: Sassafras River. The segment name was changed to SASOH with no
changes to the boundary.
Segment ET4: Chester River. This original segment contained three monitoring
stations reflecting two salinity regimes. The original segment was divided in two,
creating a mesohaline segment (CHSMH) using the old downstream boundary line
for segment ET4 as the boundary line between CHSMH and the mainstem Chesa-
peake Bay, and an oligohaline segment (CHSOH) with a boundary line at the
interpolated salinity breakpoint between stations ET4.1 and ET4.2. A tidal-fresh
segment (CHSTF) was created upstream from station ET4.2 at the original upstream
boundary line for segment ET4. The validity of that line was corroborated by esti-
mating the location of the 0.5 ppt salinity isopleth based on the rate of change in
salinity between the ET4.1 and ET4.2. The upstream boundary of CHSTF is head of
tide.
Segment EE1: Eastern Bay. The boundary between old EE1 and the mainstem
Chesapeake Bay was moved slightly eastward so that station CB4. IE was contained
in segment CB4 (now CB4MH). The segment name was changed to EASMH. Water
quality data were insufficient (no monitoring stations) to delineate additional bound-
aries upstream near the Miles and Wye rivers.
Segments EE2 and ET5: The embayment at the mouth of the Choptank River and
Choptank River proper. All of segment EE2 and the lower part of ET5 were charac-
terized as mesohaline; the upstream station, ET5.1, was determined to be
oligohaline. The next upstream station is River Input station ET5.0, which charac-
terizes free flowing fresh water. The mesohaline region was divided into three
segments:
Segment CHOMH2 included the lower part of original segment ET5 bounded
above by a new line at the interpolated salinity breakpoint between mesohaline
station ET5.2 and oligohaline station ET5.1 and below, at the old segment line
between ET5 and EE2;
Segment CHOMH1 was formed by the embayment, i.e., the northern part of
original segment EE2, with the old segment line between the mainstem Chesa-
peake Bay and EE2 forming the western boundary; and
Segment LCHMH was formed by the southern part of the original segment
EE2, the Little Choptank River.
In addition, an oligohaline segment (CHOOH) in the upper Choptank River was
created using the line between stations ET5.2 and ET5.1 as the lower boundary and
a line upstream of ET5.1 at an interpolated breakpoint as the upper boundary. A
tidal-fresh segment (CHOTF) was created with an upper boundary defined by the
limit of tidal influence. Segment CHOTF has no monitoring station at this time.
Segment EE3: Tangier Sound and surrounding tributaries. The original Tangier
Sound segment was renamed as TANMH and revised by moving the boundary
between EE3 and the Chesapeake Bay mainstem segment CBS westward just far
chapter iii 1997-1998 Segmentation Scheme
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14
enough to include Bloodsworth, Smith, Tangier and the other islands in that line plus
the shallow waters to their western side. The western boundary was delineated to
include shallow water habitats out to two meters mean low water. This boundary line
was 'bent' eastward to meet the southern tip of lower Hooper Island. New separate
segments were created for the Honga River (HNGMH), which contains no fixed
monitoring station at this time, and another for Fishing Bay (FSBMH) containing
station EE3.0, with the boundary lines being drawn at the respective tributary
mouths. The existing boundaries were retained at the mouths of the Nanticoke and
Wicomico rivers. The boundaries of TANMH were adjusted with the lower Tangier
tributary segments and with the lower Chesapeake Bay segment as described below.3
Segment ET6: Nanticoke River. The original segment was subdivided into three
segments: a mesohaline segment (NANMH) containing monitoring station ET6.2, an
oligohaline segment (NANOH) containing no monitoring station and a tidal-fresh
segment (NANTF), containing monitoring station ET6.1. The original EE3-ET6
segment line was retained as the boundary between the Tangier Sound (TANMH)
and lower Nanticoke River (NANMH) segments. The interpolated salinity break-
points were used to determine the boundaries of the oligohaline and tidal fresh
segments.
Segment ET7: Wicomico River and Monie Bay. The segment name was changed to
WICMH with no changes to the boundary.
Segment ET8: Manokin River. The EE3-ET8 boundary was moved westward to
contain Little Deal Island within the renamed segment (MNKMH).
Segment ET9: Big Annemessex. The original EE3-ET9 boundary was moved west-
ward to include the terminal island on the north side of the river mouth within the
renamed segment (BIGMH).
Segment ET10: Pocomoke River. Three new separate segments (POCMH, POCOH
and POCTF) were created. POCMH includes the mesohaline portions of Pocomoke
River and Pocomoke Sound. The lower boundary was drawn across the mouth of
Pocomoke Sound from the mainland below Crisfield to the south shore of Pocomoke
Sound, joining the TANMH-CB7MH boundary and diverting around Beach Island.
The new segment line intersected land on the southeast shore of Pocomoke Sound
between Deep Creek and Doe Creek. All the islands on the west side of Tangier
Sound including Bloodsworth, South Marsh, Smith, Tangier, Walls and Cedar
islands were included in TANMH. Beach Island and surrounding shallow-water
habitats out to two meters mean low water at the base of Beasly Bay and station
EE3.5 were included in the new mainstem Chesapeake Bay segment CB7PH. There
are three tidal water quality monitoring stations in the Pocomoke River: stations
EE3.3 and EE3.4 are both mesohaline and were located in the new segment
3A recommendation to divide EE3 in half, with a boundary line extending laterally from a point
between the Manokin and Big Annemessex rivers between the islands to the north-south boundary
between EE3 and CBS, was rejected because it did not conform to the general rules considered and
there were no compelling arguments in favor of such a change.
chapter iii 1997-1998 Segmentation Scheme
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15
POCMH. The upstream station, ET10.1, is tidal-fresh and was located in the new
segment POCTF. The new oligohaline segment POCOH contains no monitoring
station at this time. The original EE3-ET10 segment line became the lower boundary
of POCOH and the interpolated salinity breakpoint marked the division between
segments POCOH and POCTF.
Segments WT1 through WT7: Bush, Gunpowder, Middle, Back, Patapsco,
Magothy and Severn rivers. Each of these western shore tidal tributaries has only one
tidal water quality monitoring station and data were insufficient to differentiate more
than one salinity zone. The segment names for the Bush (BSHOH), Gunpowder
(GUNOH), Middle (MIDOH), Back (BACOH), Patapsco (PATMH), Magothy
(MAGMH) and Severn (SEVMH) rivers were changed with no changes made to the
boundaries.
Segment WT8: South, Rhode and West rivers. The original segment contained tidal
water quality monitoring stations in three separate tidal tributaries. Separate
segments were created for each tidal tributary with segment lines drawn at the
mouths of the respective individual rivers: South (SOUMH), Rhode (RHDMH) and
West (WSTMH) rivers. The available water quality data were insufficient to define
oligohaline or tidal-fresh segments within these individual tidal tributaries.
Segments TF1, RET1 and LEI: Patuxent River. Data from the tidal water quality
monitoring stations indicated three salinity regimes along the tidal river. The main-
stem of the tidal Patuxent River was divided into three segments with the old
segment line between LEI and the mainstem Chesapeake Bay segment CBS
preserved as the downstream boundary of the new mesohaline segment PAXMH.
The old segment line between RET1 and TF1 was used as the boundary between
PAXMH and the new oligohaline segment PAXOH. The boundary between PAXOH
and the new tidal-fresh segment PAXTF was established using the interpolated
salinity breakpoint between stations TF1.5 and TF1.6. A separate segment (WBRTF)
was created for the Patuxent River's Western Branch tributary, which contains two
tidal water quality monitoring stations.
Segments TF2, RET2 and LE2: Potomac River. The tidal Potomac River contains
three salinity regimes and has several minor tidal tributaries of special interest.
Although large, the mesohaline region was delineated as one segment (POTMH),
with the downstream boundary drawn eastward of the original LE2-CB5 segment
line to include station LE2.3. A new oligohaline segment (POTOH) was created
using the interpolated salinity breakpoint between stations RET2.4 and RET2.3 as
the lower boundary.4 A new tidal-fresh segment (POTTF) was created using the old
4A suggestion to subdivide POTTF on the basis of SAV trends and on the basis of different data col-
lecting agencies was rejected. It should be noted, however, that most tidal water quality analyses for
segment POTTF to date have included data only from stations south of and including TF2.1 (near Fort
Washington and Piscataway Creek). For a number of years, Anacostia River stations were assigned to
segment POTTF in the Chesapeake Bay Program monitoring database. However, no known Data
Analysis Workgroup or Tidal Monitoring and Analysis Workgroup sponsored analysis was ever done
that pooled all these stations into one segment. See the section '2003 Segmentation Scheme' for more
documentation and further changes to segment POTTF.
chapter iii 1997-1998 Segmentation Scheme
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16
RET2-TF2 segment line. Its upper boundary was the fall-line gauging station at
Little Falls. Separate segments were created for the two smaller tidal tributaries to
the Potomac River which had tidal water quality monitoring stations: Mattawoman
Creek (MATTF) and Piscataway Creek (PISTF).
Segments TF3, RET3 and LE3: Rappahannock River. The tidal Rappahannock
River contains three salinity regimes. In the first draft of the new segmentation
scheme, which was used in the 1997 re-evaluation, the recommendation was to
divide the mesohaline portion of the river's mainstem into two segments, RPPMH1
and RPPMH2, which approximated old segments LE3 plus station LE3.6 and RETS,
respectively. Upon subsequent review, the mainstem mesohaline region was delin-
eated as one segment, to conform with decision precedents in the tidal Potomac
River and elsewhere. The tidal Piankatank River, containing station LE3.7, was
delineated as a separate new segment (PIAMH) with the boundary between this tidal
tributary and the mainstem Chesapeake Bay delineated so that Milford Haven and
nearby tidal creeks were included in this segment. In the mainstem of the Rappa-
hannock River, a single mesohaline segment (RPPMH) was created containing both
original segments LE3 and RETS. The segment line was drawn at the river mouth,
connecting the terminal points of land and adjusting the line so that station LE3.6
was included in the mesohaline river segment. The tidal Corrotoman River, which
contains station LE3.3 and which empties into this segment, was delineated as a
separate new segment (CRRMH). In the mainstem Rappahannock River, a new
oligohaline segment (RPPOH) was created containing only station TF3.3, using the
original TF3-RET3 segment line as the lower boundary with RPPMH, and the inter-
polated salinity isopleth between stations TF3.3 and TF3.2 defining the upper
boundary. A new tidal-fresh segment (RPPTF) was delineated upstream of this point
with the northern extent defined by the limit of tidal influence.
Segments LE4, RET4 and TF4: York River. The tidal York River is formed from
the confluence of the tidal Mattaponi and Pamunkey rivers. Tidal-fresh/oligohaline
conditions in the headwaters extend to the point of confluence and the York River
proper is mesohaline, transitioning to polyhaline by the time it reaches Mobjack Bay.
A polyhaline segment (YRKPH) was created extending upstream from a new line at
the river mouth to the interpolated salinity cut-off point between station LE4.2 (in
YRKPH) and LE4.1 (in YRKMH).5 At the lower boundary, the original LE4-WE4
segment line was moved eastward to the natural transition point of the river mouth,
leaving the SAV beds on the southern rim in the Mobjack Bay segment (MOBPH).
The upper boundary of segment YRKMH was delineated at the confluence of the
Mattaponi and Pamunkey rivers at West Point Bridge. The segment lines were drawn
5A recommendation to move the York River mouth boundary further out to include station WE4.2 was
rejected (see discussion of segment WE4, below). A recommendation to divide the polyhaline segment
in two at the constriction near Gloucester Point was also rejected. This recommendation was based on
SAV distribution: SAV was present below, but sparse above this point. The recommendation was
rejected because SAV distribution per se was not a deciding factor, and breaking up salinity zones
within water bodies had been rejected in other major tidal tributaries.
chapter iii 1997-1998 Segmentation Scheme
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17
at the mouths of each of these tidal rivers to indicate the lower boundaries of their
oligohaline segments (MPNOH and PMKOH, respectively). The segment boundary
between MPNOH and the new Mattaponi River tidal-fresh segment MPNTF was
based on the interpolated line between stations RET4.2 and TF4.4A. The boundary
between PMKOH and the new Pamunkey River tidal-fresh segment (PMKTF) was
the interpolated line between stations RET4.1 and TF4.2.
Segment WE4: Mobjack Bay. This western embayment is large with influences
from the mainstem Chesapeake Bay, the York River, the Poquoson and Back rivers,
and several minor tidal tributaries. The segment name was changed to MOBPH;
there were no boundary changes except for the York River mouth as described
above.6
Segments LE5, RETS and TF5: James and Elizabeth rivers. The tidal James River
contains all four salinity regimes. A polyhaline segment (JMSPH) was created
extending from the mouth of the river through station LE5.4. The original segment
line at the mouth of the river was moved eastward to include station LE5.5 in
JMSPH. The original boundary between this region and the Elizabeth River was
retained so that station LE5.6 was excluded from JMSPH and included in the Eliza-
beth River segment. A boundary was drawn at the interpolated line between stations
LE5.4 and LE5.3 to create the upper boundary of the new polyhaline segment and
lower boundary of the new mesohaline segment JMSMH. A boundary was drawn at
the interpolated line between stations LE5.2 and LE5.1 to form the upper boundary
of JMSMH and the lower boundary of the new oligohaline segment (JMSOH). The
Chickahominy River, which contains a monitoring station and which empties into
segment JMSOH is also oligohaline. The Chickahominy River was delineated as a
separate new segment, CHKOH. In the mainstem James River, a new tidal-fresh
segment JMSTF was created with the boundary between the oligohaline and tidal-
fresh region set as the original segment line between RETS and TF5.
The east, south and west branches of the tidal Elizabeth River converge to a single
main channel leading into the tidal James River before discharging to the Chesa-
peake Bay. Each branch has tidal water quality monitoring stations, as does the
mainstem Elizabeth River. The polyhaline and mesohaline salinity zones are moni-
tored for water quality conditions at present. Another tidal tributary, the Lafayette
River, enters the Elizabeth near its mouth. A segment line was drawn across the
mouth of the Elizabeth River connecting the terminal land extensions on either side
of the river. A new polyhaline segment ELIPH containing station LE5.6 and a new
mesohaline segment ELIMH containing station ELI2 within the mainstem of the
river were delineated, with a boundary established between them at the interpolated
Suggestions were made to divide WE4 in half and to extend the lower York segment bay ward another
increment to include station WE4.2. Both these suggestions were rejected. The circulation is complex
in this region and it is uncertain where to subdivide the water body. Furthermore, the relative influence
of the river versus that of the larger water body of Mobjack Bay and the mainstem Chesapeake Bay
was not known. It was decided that station WE4.2 needs to be included in any characterization of the
Mobjack Bay segment since it represents the York River influence and this segment.
chapter iii 1997-1998 Segmentation Scheme
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18
salinity breakpoint. A new separate segment was created for the Lafayette River
(LAFMH). Separate new mesohaline segments were created for each branch
(EBEMH for the Eastern Branch, SBEMH for the Southern Branch, and WBEMH
for the Western Branch) with boundaries delineated at their respective mouths.7
Segments CB1 through CBS: mainstem Chesapeake Bay. The Chesapeake Bay
contains all four salinity regimes. The segment CB1 boundary was changed to a new
line between stations CB2.1 and CB2.2 forming a new tidal-fresh segment CB1TF.
A new oligohaline segment CB2OH was created extending from this line to a new
segment line between stations CB3.1 and CB3.2.
The mesohaline region extends from this boundary through station CBS.5. Within
this region, three new mesohaline segments were created using the subdivisions of
the original 1983 segmentation scheme such that the old CB3-CB4 segment line
formed the southern boundary of the new segment CB3MH, the old CB4-CB5 line
formed the southern boundary of the new segment CB4MH and the old CB5-
CB6/CB7 segment lines formed the southern boundary of the new segment CB5MH.
The eastern boundary of CBS (CB5MH) was moved westward as described above
for the Tangier Sound region.
The polyhaline region extends from the southern boundary of CB5MH to the mouth
of the Chesapeake Bay, including original segments CB6, CB7 and CBS. The EE3-
CB7 line at the northeast corner, was moved to follow the deep channel and join the
segment line for Pocomoke Sound around Beach Island, so that Beach Island and
monitoring station EE3.5 are in CB7PH. The original segmentation (forming the
new segments CB6PH, CB7PH and CB8PH) was retained with a few modifications.8
The western boundaries were revised as mentioned above such that station LE3.6
was removed from CB6PH (see 'Segments TF3, RET3 and LE3' above), LE5.5 was
removed from CB8PH (see 'Segments LE5, RETS and TF5' above) and station
CB7.4 at the mouth of the Bay was retained in CB8PH. The boundary line at the
mouth of the Chesapeake Bay for segments CB7PH and CB8PH was moved east-
ward to encompass Fishermans Island.
7In 1997, there was a question whether station ELI2 in ELIMH was mesohaline or polyhaline (mean
salinity = 17.9) and, as a consequence, whether the mainstem Elizabeth River should be divided into
mesohaline and polyhaline segments or unified into a single polyhaline segment. A decision was made
to keep separate mesohaline and polyhaline segments because 1) the two stations (LE5.6 and ELI2) in
the mainstem of the river are sampled by two different programs and the results should be treated sep-
arately; and 2) there were some exceptions to the strict salinity cutoff points. The salinity record for
station ELI2 was only eight years at that time (in contrast to the 12-year record for most other stations)
and flows suggested a freshening trend in many rivers. However, this decision was subsequently
reversed and the segments were ultimately joined: ELIMH became part of ELIPH. See '2003
Segmentation Scheme'.
8The northern monitoring stations in old segments CB6 and CB7 are borderline mesohaline-polyhaline.
A recommendation was put forth to group these stations (CB6.1, CB6.2, CB7.1S, CB7.1, CB7.1N and
EE3.5) together to form a single segment and to group the rest of the stations in old segments CB6 and
CB7 in another segment. Results of an earlier analysis of spatial differences among water quality
parameters had suggested a similar grouping, as did the 1985-1996 water quality trends (Magnien et
al. 1991). However, acknowledging the east-west gradient, it was decided to keep the four CB6 sta-
tions along the western shore as one polyhaline segment, CB6PH, and the CB7 stations (including
EE3.5 and excluding CB7.4) along the eastern shore in CB7PH.
chapter iii 1997-1998 Segmentation Scheme
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19
chapter
2003 Segmentation Scheme
Between 1998 and 2003, a few inadvertent errors in station coordinates and segment
lines were discovered and subsequently corrected in the 2003 segmentation (Figure
4). For the most part, the changes were small and undetectable at the scale of the
figures in this document. However, discrepancies might show up as small differences
in volume, area or perimeter citations for affected segments. In addition, the segmen-
tation scheme was expanded in the Potomac River to incorporate additional
below-fall line stations in the tidal Potomac and Anacostia rivers. The details of the
changes from the 1998 to 2003 segmentation schemes are described below.
Elizabeth River: Stations in ELIMH were redefined as polyhaline based on salinity
data from first sampling (1989 and after) through 2001 and the segment was joined
with ELIPH with the segment retaining the name ELIPH (Figure 4). The affected
water quality monitoring stations were ELD01, ELE01, ELI2 and ELI3.
James River: Stations LE5.5A and LE5.5B, sampled only in 1994 as part of the
Enhanced Monitoring Project, were erroneously assigned to segment JMSPH. They
are actually located in CB8PH. Similarly, station TF5.6A was mis-assigned to
segment JMSTF. It is actually located in JMSOH (Figure 4).
Mattaponi River: The boundary between segments MPNTF and MPNOH in the
Chesapeake Bay Program GIS coverage for the 1998 segmentation scheme was erro-
neously located such that station TF4.4A appeared to be located in MPNOH. The
line was moved so that the station now correctly lies in segment MPNTF (Figure 4).
Choptank River: Similarly, the boundary between segments CHOTF and CHOOH
in the Chesapeake Bay Program GIS coverage was erroneously located such that
station ET5.1 appeared to be located in CHOTF. The line was moved so that the
station now correctly lies in segment CHOOH (Figure 4).
Anacostia River: A new segment for the Anacostia River tidal water quality moni-
toring stations was created (ANATF) (Figure 4). Anacostia stations previously
assigned to segment POTTF (for the Chesapeake Bay Program Watershed modeling
chapter iv 2003 Segmentation Scheme
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20
GUNOH
PATMH
RPPTF
MAGMH
SEVMH
SOUMH
RHDMH
ANATF WSH
Figure 4. 2003 Chesapeake Bay Program segmentation scheme.
Source: Chesapeake Bay Program.
chapter iv 2003 Segmentation Scheme
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21
purposes) were reassigned to ANATF or ANANT (non-tidal reaches of the Anacostia
watershed) (Appendix A Table A-l).
Potomac River: Stations located in the tidal Potomac River below the fall line and
sampled by agencies of the District of Columbia were assigned to POTTF (Appendix
A Table A-l).
SUB-SEGMENTS FOR STATE WATER QUALITY
STANDARDS APPLICATIONS
MARYLAND'S SPLIT SEGMENTS FOR
SHALLOW WATER BAY GRASS DESIGNATED USE
The Maryland Department of Natural Resources applied the draft water clarity
criteria to 1999-2001 SAV habitat conditions and compared the results with the
proposed water clarity application depths. They discovered that certain segments, if
left in their entirety, could not meet the water clarity criteria even though they
already contained substantial amounts of SAV. The SAV was not growing in prox-
imity to the segment's tidal water quality monitoring station and, therefore, the
station measurements were not accurately describing in-situ conditions. In other
words, the station measurements might have described poor water quality conditions
but the abundant SAV in another part of the segment indicated otherwise. Some
segments had sizable areas of SAV but their upper tidal portions would support little
or no SAV growth due to more localized adverse physical conditions.
Due to these discrepancies, Maryland representatives requested certain Chesapeake
Bay Program segments be subdivided in order to establish attainable water clarity
standards and SAV restoration goals for those segments. A series of very targeted
subdivisions of the 2003 Chesapeake Bay Program segments were made to set even
more geographically specific shallow-water designated use boundary delineations
based on agreed upon decision rules for determining the application depth for the
water clarity criteria to support SAV beds (U.S. EPA 2004).
The segments involved were the Northern Chesapeake Bay (CB1TF), Elk River
(ELKOH), Gunpowder River (GUNOH), Sassafras River (SASOH), Upper Potomac
River (POTTF), Middle Potomac River (POTOH), Lower Patuxent River (PAXMH),
Tangier Sound (TANMH), Manokin River (MANMH) and Big Annemessex River
(BIGMH). General subdivision boundaries were assigned. The majority of a given
segment was retained, with one or more sections of the segment being partitioned.
When actually defining the subdivision boundaries digitally, physical features such
as points, mouths of streams, etc. were used as end points wherever possible. In
some segments, such as Manokin River and Big Annemessex River, a 'natural break'
between an area containing a lot of SAV and an area with little or no SAV was used
to guide where the subdivision boundary line was drawn.
chapter iv 2003 Segmentation Scheme
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22
The same analyses that were done to ascertain the original water clarity criteria
application depths were performed on the new segment subdivisions to assign new
application depths (U.S. EPA 2003, 2004). Most of the main portions of those subdi-
vided segments maintained their original water clarity criteria application depths
while two (Sassafras River and Lower Patuxent River) had their application depths
increased to 1-2 meters in depth. The smaller subdivisions had application depths
ranging among all three-depth classes: 0-0.5, >0.5-1 and >l-2 meters.
Figure 5 shows those the Chesapeake Bay Program segments in Maryland tidal
waters that were subdivided and their new water clarity criteria application depths.
Appendix B Table B-l lists and spatially defines the subdivided segments.
VIRGINIA'S UPPER JAMES RIVER SPLIT SEGMENT
The James River tidal fresh segment (JMSTF) was sub-divided into an upper
segment (JMSTF2) and a lower segment (JMSTF 1) for application of new water
clarity and chlorophyll a water quality standards (U.S. EPA 2004). The upper
segment (JMSTF2), which extends from Richmond to Hopewell, is narrower, faster
flowing and with much greater average depth. This translates to a lower residence
time for algal biomass to develop (i.e., naturally lower chlorophyll a levels) as well
as less available habitat for SAV. The river widens from approximately 0.4 miles
across at the end of segment JMSTF2 to as much as 1.6 miles shortly downriver in
the segment JMSTF2 region of Hopewell. The tidal Appomattox River enters the
James River here. There are much wider shoals (i.e., greater natural SAV habitat
availability), and a greater photic zone area due to the increased width-depth ratio.
The greater photic zone area and greater residence time leads to naturally higher
chlorophyll a levels in JMSTF1.
Figure 6 shows the subdivided upper tidal James River segments and their new water
clarity criteria application depths. Appendix B Table B-l lists and spatially defines
the subdivided segments.
LITERATURE CITED
Magnien, R., R. Eskin, R. Hoffman and T. Parham. 1991. Water Quality Character-
ization Report for the 1991 Re-Evaluation of the Chesapeake Bay Nutrient
Reduction Strategy. Chesapeake Bay Program, Annapolis, Maryland.
U.S. Environmental Protection Agency. 2004. Technical Support Document for Iden-
tification of Chesapeake Bay Designated Uses and Attainability2004 Addendum.
EPA 903-R-04-006. Region 3 Chesapeake Bay Program Office, Annapolis, Mary-
land.
U.S. Environmental Protection Agency. 2003. Technical Support Document for Iden-
tification of Chesapeake Bay Designated Uses and Attainability. EPA 903-R-03-004.
Region 3 Chesapeake Bay Program Office, Annapolis, Maryland.
chapter iv 2003 Segmentation Scheme
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23
Application depth
05-1m
1-2m
POTOH3
^POTOHI PAXMH4^^!(
\ V-'v
^^^
**-*- 'ป*
S**^
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24
T
0 5 10 15 20 Miles
Figure 6. Virginia's split Chesapeake Bay Program segments for the application of water clarity
and chlorophyll a water quality standards.
Source: U.S. EPA 2004.
chapter iv 2003 Segmentation Scheme
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25
chapter
Information Related to the
Segmentation Schemes
MONITORING STATIONS AND PAST/PRESENT
SEGMENTATION SCHEMES
Appendix A lists the water quality and biological monitoring stations in the Chesa-
peake Bay and its tidal tributaries. Table A-l shows the relationship between the
1983, 1997, 1998, and 2003 segmentation schemes for the mainstem Chesapeake
Bay and tidal tributary water quality monitoring stations. Some nontidal stations
situated below the fall line also are included, because their data are closely linked to
analysis with associated tidal water quality monitoring stations, such as in the St.
Mary's, upper Potomac and Anacostia rivers.
Some changes have been made through time to the segment names with regard to the
designation between a station that is above the fall line and a nontidal station. In the
1983 segmentation scheme, the AFL segment code was used to label both above fall
line and nontidal stations. In the 1998 segmentation scheme, stations above the fall
line had a segment code ending in TF (tidal-fresh), even though there was no tidal
influence. The 2003 segmentation scheme uses NT (nontidal) as the last two char-
acters of a segment name to denote a station or segment that is not influenced by the
tidal flow, e.g., ANANT. Most stations located in an NT segment will be in the above
fall line category; however, some are located below the fall line. It is important to
note there was no actual GIS segment coverage for the 1985 AFL segments and there
is none currently for the 2003 NT segments.
Not all the stations listed in Appendix A Table A-l have data in the Chesapeake
Information Management System's databases through the entire period of record
(1984 to present). For example, the east and west mainstem lateral stations are not
sampled during the winter months, and some tidal tributary stations were sampled
for short-term special projects. In recent years, data from new monitoring projects
have been added to the networked series of databases. Data for the last 10 stations
listed under Eastern Shore Tributaries and Embayments-Maryland in Table A-l
were added to the database beginning in March 2003. Prior to this, these stations had
chapter v Information Related to Segmentation Schemes
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26
been part of the Maryland Pfiesteria monitoring project. Most stations listed under
Eastern Shore Tributaries and Embayments-Virginia, were sampled from January
2001 through June 2002, while the Cherrystone Inlet stations were sampled through
December 2002. Sampling stopped for all stations on this project after December
due to funding restraints. The Indian Head (IH) station data in the Potomac-Matta-
woman Creek area were added beginning in April 2000. This is an ongoing project
of special interest to SAV restoration. Finally, St. Mary's River data were added
beginning in mid-1999, and that project continues at this time. The tidal stations are
included in the Potomac segment POTMH. At present, no separate St. Mary's River
segment has been defined.
Missing data are flagged with a period (.) in the table. If a Chesapeake Bay Program
(CBP) Station or Agency Station value is missing, there were no stations located
within that defined segment (e.g. CHSTF, CHOTF, HNGMH, POCOH, LYNPH)
during the early years of data collection. Currently one station is being sampled in
segment POCOH. A missing segment code value means that no data were in the
database for that segment period, or no GIS segment coverage was defined for that
area. An exception is segment ANATF for the Anacostia River, which had been listed
in the database stations table but did not have an actual GIS coverage. A GIS
segment was created for ANATF in the 2003 revision. A missing total depth value is
caused by no total depth value being recorded with the data. This happened
frequently with very shallow stations.
In Appendix A, water quality monitoring stations are shown on the station maps for
Maryland Chesapeake Bay mainstem (Figure A-l), Maryland tidal tributaries
(Figure A-2), Virginia Chesapeake Bay mainstem (Figure A-3), Virginia tidal tribu-
taries (Figure A-4), Elizabeth River (Figure A-5), upper Potomac and Anacostia river
(Figure A-6) and St. Mary's River (Figure A-7). The complete list of monitoring
locations for which data exist in the Chesapeake Information Management System's
networked databases is available in the stations table at www.chesapeakebay.net/
data/index.htm.
2003 SEGMENTATION STATISTICS
Table 1 contains the perimeter, area and volume statistics for each of the 2003 seg-
mentation scheme's segments. These statistics were calculated using GIS software
and the Chesapeake Bay Program Volumetric Interpolator which is currently being
revised. Some of these segments were modified in the 2003 update and the old
version of the Interpolator does not have the new segment boundaries with which to
calculate a new, correct volume. In addition, all segment volumes may be slightly
changed when the new version of the Interpolator is completed in 2004. More infor-
mation about the Interpolator can be found on the Chesapeake Bay Program website,
at www.chesapeakebay.net/cims/interpolator.htm.
chapter v Information Related to Segmentation Schemes
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27
Table 1. 2003 Chesapeake Bay Program Segments Perimeter, Area and
Volume Statistics
2003
Segment
CB1TF
CB2OH
CB3MH
CB4MH
CB5MH
CB6PH
CB7PH
CB8PH
NORTF
C&DOH
BOHOH
ELKOH
SASOH
CHSTF
CHSOH
CHSMH
EASMH
CHOTF
CHOOH
CHOMH2
CHOMH1
LCHMH
HNGMH
FSBMH
NANTF
NANOH
NANMH
WICMH
MANMH
BIGMH
POCTF
POCOH
POCMH
TANMH
BSHOH
GUNOH
MIDOH
BACOH
PATMH
MAGMH
SEVMH
SOUMH
RHDMH
WSTMH
PAXTF
WBRTF
PAXOH
PAXMH
ANATF
PISTF
MATTF
Water
Body
MAINBAY
MAINBAY
MAINBAY
MAINBAY
MAINBAY
MAINBAY
MAINBAY
MAINBAY
NORTHEAST
C&D CANAL
BOHEMIA
ELK
SASSAFRAS
CHESTER
CHESTER
CHESTER
EASTERN BAY
CHOPTANK
CHOPTANK
CHOPTANK
CHOPTANK
LITTLE CHOPTANK
HONGA RIVER
FISHING BAY
NANTICOKE
NANTICOKE
NANTICOKE
WICOMICO
MANOKIN
BIG ANNEMESSEX
POCOMOKE
POCOMOKE
POCOMOKE
TANGIER SOUND
BUSH
GUNPOWDER
MIDDLE
BACK_MD
PATAPSCO
MAGOTHY
SEVERN_MD
SOUTH
RHODE
WEST
PATUXENT
PATUXENT-WESTRNBRNCH
PATUXENT
PATUXENT
ANACOSTIA
POTOMAC-PISCATAWAY
POTOMAC-MATTAWOMAN
Perimeter
[meters]
216814
246410
145496
326788
842496
278815
956822
146606
40617
35654
79964
138710
161366
60350
124641
363647
619132
150022
145797
206492
537319
407700
246072
295582
69276
238038
219270
285770
275258
162996
77456
116755
483373
1046674
107046
163323
93914
64832
339736
121642
153435
129040
43830
58041
55373
5181
76397
348050
37796
15219
37045
Area
[meters2]
151620944
275239520
361585728
908849967
1474652418
743353039
1520821583
412427744
15817689
3565828
11927636
37270004
33085712
4084016
14790537
119290907
234558868
8906181
15037649
74200120
242057248
89578958
97719184
83505552
4608463
16455330
48357788
35116516
60788916
29067984
3998871
13821501
195923574
897937604
30542696
41998392
16214070
16175354
93604632
26541486
29387340
23982120
9110563
11303989
4408622
131511
14243456
107580204
3406518
3708997
7280895
Volume
[meters3]
360000000
1237000000
2391000000
9237000000
15416000000
6503000000
13523000000
3172000000
26500000
24130000
17000000
101250000
84187500
3362500
28875000
455250000
996750000
15000000*
45000000*
266750000
945000000
208250000
185680000
143000000
6615000
45000000
97250000
56420000
89500000
43625000
4470000
18000000
354500000
4019000000
49250000
64250000
25000000
22375000
451500000
76500000
113437500
67000000
20312500
20375000
11025000
27180000
561000000
*
2850000
9500000
continued
chapter v Information Related to Segmentation Schemes
-------
28
Table 1. 2003 Chesapeake Bay Program Segments Perimeter, Area and
Volume Statistics (cont).
2003
Segment
POTTF
POTOH
POTMH
RPPTF
RPPOH
RPPMH
CRRMH
PIAMH
MPNTF
MPNOH
PMKTF
PMKOH
YRKMH
YRKPH
MOBPH
JMSTF
APPTF
JMSOH
CHKOH
JMSMH
JMSPH
WBEMH
SBEMH
EBEMH
LAFMH
ELIPH**
LYNPH
Water
Body
POTOMAC
POTOMAC
POTOMAC
RAPPAHANNOCK
RAPPAHANNOCK
RAPPAHANNOCK
RAPP-CORROTOMAN
PIANKATANK
YORK-MATTAPONI
YORK-MATTAPONI
YORK-PAMUNKEY
YORK-PAMUNKEY
YORK
YORK
MOBJACK BAY
JAMES
JAMES-APPOMATTOX
JAMES
JAMES-CHICKAHOMINY
JAMES
JAMES
ELIZ-WESTBRNCH
ELIZ-SOUTHBRNCH
ELIZ-EASTBRNCH
ELIZ-LAFAYETTE
ELIZABETH RIVER
LYNNHAVEN
Perimeter
[meters]
330128
312495
1277757
252716
112097
724298
146952
286397
116461
100741
264700
119417
321194
209230
987544
562776
168938
271459
355816
552699
120958
56237
171896
99682
87952
64695
289316
Area
[meters2]
150435104
214963696
887864640
36503308
19536530
323830688
23483608
69774176
9280244
7952139
16229024
14093807
94595793
68414728
342714372
95301848
8011611
127749032
27969270
304241056
76561904
6006832
8393598
5774440
5754146
21152682
19607176
Volume
[meters3]
450000000*
852250000
5792000000
107437500
53580000
1482250000
65687500
201437500
15000000*
35000000*
28630000
66680000
275500000
400750000
1342500000
286187500
1510000
431500000
48562500
977000000
434000000
6310000
27730000
6460000
3390000
114890000
16730000
Conversions:
Square meters to acres: multiply by 0.0002471054
Square meters to miles: multiply by 0.0000003861003
Meters to miles: multiply by 0.0006213697
Cubic meters to liters: multiply by 1000
Note: For general reporting purposes, the total area of the tidal waters of the Bay and tributaries is 1,166,584
hectares, or 2,881,463 acres; these waters are surrounded by 11,684 miles of shoreline.
*Volume is approximate.
. No bathymetry available for segment WBRTF.
**ELIPH was at one time two segments: ELIMH and ELIPH (see text).The statistics for those segments were:
ELIMH ELIZABETH RIVER 53103.41 12203789.00 53390000
ELIPH ELIZABETH RIVER 15760.59 8948893.00 61500000
Source: Chesapeake Bay Program.
chapter v Information Related to Segmentation Schemes
-------
29
SEGMENT BOUNDARY COORDINATES
Comprehensive documentation of the spatial boundaries of individual Chesapeake
Bay Program segments was undertaken to satisfy the needs of the Chesapeake Bay
Program and its partner jurisdictions. Appendix C provides textual descriptions of
the coordinates bounding each of the 78 segments within the 2003 segmentation
scheme. Each segment definition contains a series of points that are defined by both
a set of latitude and longitude coordinates in decimal degrees and a textual narrative
describing their location. The segment boundaries follow the shorelines between the
geo-referenced boundary coordinates including within each segment, all tidally
influenced waters. Examples of definition points are the two (or more) points delin-
eating the mouth of a river or bay, the farthest upstream point(s) in the segment and
points delineating where a segment boundary line changes direction (usually occur-
ring in open-water Chesapeake Bay segments). The number of points used to define
the segment boundaries is as few as 2 (LYNPH) and as many as 31 (TANMH) with
the majority of segments (47 of 78) having 3 or 4 points.
The order in which points were numbered followed a few simple rules. The first
point, whenever possible, was always at the mouth of a river on the side of the mouth
so that when proceeding counter-clockwise the second point also helped to define
the mouth. The ordering would then proceed counter-clockwise until all points were
numbered and defined. Upstream segments (e.g. POTOH and JMSTF) would be
ordered in a similar fashion beginning with the downstream line used to define that
segment. The mainstem Chesapeake Bay segments (e.g. CB3MH, CB7PH) generally
began numbering at their southwestern-most point. Some embayment-like segments
(e.g. LYNPH) do not contain upstream points because they lack a clear main feeder
stream to act as an upstream terminus.
Digital versions of USGS quad sheets, Delorme state atlases and NOAA naviga-
tional charts were used as visual aids in creating the narrative descriptions. When
creating the narrative descriptions for the segment delineation points, an existing
reference name (e.g. Turkey Point, Travilla Wharf) was used whenever possible.
When a point was not at an identifiable location, the description was often given as
a distance to an object such as a stream, road, lighthouse, etc. These distances are not
absolute but are approximations, subject to the scale of the data and the fact that
many of the distance measurements taken were not along a straight line between two
points but followed a shoreline or stream.
WEB ACCESS TO SEGMENTATION SCHEMES
The Chesapeake Bay Program partners maintain web access to segmentation
schemes at www.chesapeakebay.net where water quality and biological data
collected as part of the Chesapeake Bay Program monitoring network are maintained
online through the Data Hub. Segment maps for 1998 and 2003 and a map of current
chapter v Information Related to Segmentation Schemes
-------
30
monitoring stations can be located under Maps and Mapping at this website. All the
segment maps and monitoring station maps in GIS export format are available at
ftp://ftp.chesapeakebay.net/pub/Geographic/ChesapeakeBay. A station table with
latitude/longitudes, UTM coordinates, segment codes and other information is
located at www.chesapeakebay.net/data/index.htm. Table C-l in Appendix C is
available electronically both as an EXCEL and a text file at www.chesapeakebay.net/
segmentscheme.htm.
chapter v Information Related to Segmentation Schemes
-------
31
appendix
Water Quality Monitoring in
Relationship to Past and Present
Chesapeake Bay Program
Segmentation Schemes
appendix a Water Quality Monitoring in Relationship to Past and Present CBP Segmentation Schemes
-------
32
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appendix a Water Quality Monitoring in Relationship to Past and Present CBP Segmentation Schemes
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37
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appendix a Water Quality Monitoring in Relationship to Past and Present CBP Segmentation Schemes
-------
42
CB4.3W. .CB4.3E
CB4.3C
CB5.1W. CB5.1
Figure A-1. Maryland Chesapeake Bay mainstem water quality stations.
Source: Chesapeake Bay Program.
appendix a Water Quality Monitoring in Relationship to Past and Present CBP Segmentation Schemes
-------
43
PENNSYLVANIA
MARYLAND
Figure A-2. Maryland tidal tributary water quality monitoring stations.
Source: Chesapeake Bay Program.
appendix a Water Quality Monitoring in Relationship to Past and Present CBP Segmentation Schemes
-------
44
Figure A-3. Virginia Chesapeake Bay mainstem water quality monitoring stations.
Source: Chesapeake Bay Program.
appendix a Water Quality Monitoring in Relationship to Past and Present CBP Segmentation Schemes
-------
45
TF5.6A nrrr ^LปI ซLE4 3
i -q 1
RET5.2 LE4-3S
Figure A-4. Virginia tidal tributary water quality monitoring stations.
Source: Chesapeake Bay Program.
appendix a Water Quality Monitoring in Relationship to Past and Present CBP Segmentation Schemes
-------
46
Figure A-5. Elizabeth River tidal water quality monitoring stations.
Source: Chesapeake Bay Program.
appendix a Water Quality Monitoring in Relationship to Past and Present CBP Segmentation Schemes
-------
47
DISTRICT
OF
COLUMBIA
V I R G I N I A
M A R Y L A N D
Legend
Fall Line
Figure A-6. Upper Potomac and Anacostia River water quality monitoring stations.
Source: Chesapeake Bay Program.
appendix a Water Quality Monitoring in Relationship to Past and Present CBP Segmentation Schemes
-------
48
N
+
Patuxenl River
SMNT05
SMNT04 SMNT03
SMNIOB
>
SMNT07
' SMNTQS
MARYLAND
SMNT09
(
SMNT09.5
Chesapeake
Bay
SMNT10
SMMT12
SMT01
1 SMNT11
SMNT02
SMTO2
SMT03 . SMNT13
SMT04
SMSMC
SMT09 SMNT01
"SMNT14
SMT13
SMT05
SMT10A
SMT08
SMT12 SMTIOB
SMT06
SMT11
SMT07
Figure A-7. St. Mary's River water quality monitoring stations.
Source: Chesapeake Bay Program.
appendix a ซ Water Quality Monitoring in Relationship to Past and Present CBP Segmentation Schemes
-------
49
appendix
Maryland's and Virginia's
Chesapeake Bay Program
Split Segments Boundary
Delineations
Table B-1. Latitude/longitude and narrative geo-reference identifiers for the end coordinates
bounding each of Maryland's and Virginia's split Chesapeake Bay Program segments.
Segment
Description
Chesapeake
Bay Program
Segment
Split
Segment
Number of Latitude/
Longitude Coordinates
to Follow
MARYLAND SPLIT SEGMENTS
Northern Chesapeake
39.420143
39.401688
39.429420
39.449200
39.449471
39.475323
39.476006
39.475132
39.475132
39.476006
39.475323
39.449471
39.529629
39.540794
39.608994
39.608959
39.609001
39.608971
Gunpowder River
39.316414
39.312862
39.312767
39.303204
39.356564
39.358330
39.326569
-76.123344
-76.035194
-75.997681
-76.007698
-76.010475
-76.072807
-76.094421
-76.097580
-76.097580
-76.094421
-76.072807
-76.010475
-75.979271
-76.002899
-76.121094
-76.132683
-76.135147
-76.143379
-76.331039
-76.321449
-76.321190
-76.296249
-76.322929
-76.345024
-76.361801
CB1TF CB1TF1 8
1000 feet southwest of Cherry Tree Point, Aberdeen Proving Ground
North of Chesapeake Haven, Grove Neck
1300 feet southwest of Wroth Point
Turkey Point
Turkey Point, 0.1 miles west southwest of lighthouse
Locust Point on Spesutie Island
East side of Spesutie Narrows bridge
West side of Spesutie Narrows bridge
CB1TF2 10
West side of Spesutie Narrows bridge
East side of Spesutie Narrows bridge
Locust Point on Spesutie Island
Turkey Point, 0.1 miles west southwest of lighthouse
Red Point
East side of Carpenter Point
Port Deposit
East side Spencer Island
West side Spencer Island
Just south of Rock Run on western shore
GUNOH GUNOH1 8
Carroll Island, midway between White Oak and Carroll Points
Carroll Point
Carroll Point
Rickett Point at end of Ricketts Point Road
Maxwell Point
Cunninghill Cove, mouth of unnamed creek
170 feet south of west side of bridge to Carroll Island
continued
appendix b Maryland's and Virginia's CBP Split Segments Boundary Delineations
-------
50
Segment
Description
Chesapeake
Bay Program
Segment
Split
Segment
Number of Latitude/
Longitude Coordinates
to Follow
39.326477
39.358330
39.356564
39.412685
Lower Patuxent
38.304638
38.319176
38.322941
38.321041
38.386593
38.389153
38.412220
38.411896
38.481140
38.475594
38.342590
38.339634
38.475594
38.481140
38.540684
38.542320
38.321041
38.322941
38.339634
38.342590
38.389153
38.386593
38.446831
38.411896
38.412220
38.433407
Middle Potomac
38.389660
38.407509
38.444935
38.444565
38.408894
38.408745
38.523266
38.524181
38.444565
38.444935
38.500164
38.408745
38.408894
38.475391
Elk River
39.449200
-76.361130
-76.345024
-76.322929
-76.400780
River
-76.421448
-76.420990
-76.451630
-76.451965
-76.498840
-76.506416
-76.542747
-76.544487
-76.647560
-76.662788
-76.500587
-76.499550
-76.662788
-76.647560
-76.668045
-76.678818
-76.451965
-76.451630
-76.499550
-76.500587
-76.506416
-76.498840
-76.492088
-76.544487
-76.542747
-76.540894
River
-77.029305
-76.997322
-77.016396
-77.040695
-77.110886
-77.124855
-77.256630
-77.285294
-77.040695
-77.016396
-77.026306
-77.124855
-77.110886
-77.130676
-76.007698
170 feet south of east side of bridge to Carroll Island
GUNOH2 3
Cunninghill Cove, mouth of unnamed creek
Maxwell Point
Gunpowder Falls, 1500 feet below Route 7
PAXMH1
12
PAXMH
Fishing Point
Drum Point
Point of land south of Ship Point and east of Ma Leg Island
Eastern tip of Solomons Island
Mouth of St. Leonard Creek, east side
Petersons Point
Island Creek mouth, east side
Island Creek mouth, Broomes Island side
0.64 miles south of Sandy Point near Buzzard Island
Trent Hall Point
Mouth of Cuckold Creek, north side
Mouth of Cuckold Creek, south side
PAXMH2 4
Trent Hall Point
0.64 miles south of Sandy Point near Buzzard Island
Gods Grace Point near end of Leitchs Wharf Road
Chalk Point, eastern side
PAXMH3 2
Eastern tip of Solomons
Point of land south of Ship Point and east of Ma Leg Island
PAXMH4 2
Mouth of Cuckold Creek, south side
Mouth of Cuckold Creek, north side
PAXMH5 3
Petersons Point
Mouth of St. Leonard Creek, east side
0.25 miles downstream of Parran Road
PAXMH6 3
Island Creek mouth, Broomes Island Side
Island Creek mouth, east side
0.7 miles north of point where Marshall Road ends
POTOH POTOH1 8
1 miles southeast of Mathias Point, just north of Route 639
0.65 miles northwest of the town of Popes Creek
1.5 miles southeast of Chapel Point, due east of Windmill Point
Windmill Point
Blossom Point
0.15 miles southwest of Benny Gray Point
1000 feet southwest of Moss Point
Midway between Shipping Point and Quantico Pier
POTOH2 3
Windmill Point
1.5 miles southeast of Chapel Point, due east of Windmill Point
Port Tobacco Marina (edge of 7.5' quad sheet)
POTOH3 3
0.15 miles southwest of Benny Gray Point
Blossom Point
Wards Run, 0.25 miles upstream of Hill Top Fork
ELKOH
Turkey Point
ELKOH1
8
continued
appendix b Maryland's and Virginia's CBP Split Segments Boundary Delineations
-------
51
Segment
Description
39.429420
39.474773
39.486473
39.523182
39.525536
39.544392
39.545540
39.545540
39.544392
39.607624
Sassafras River
39.389511
39.372025
39.371868
39.378330
39.378330
39.371868
39.376785
Tangier Sound
37.792580
37.781960
37.846237
37.924927
38.015781
38.016033
38.020733
38.020973
38.036049
38.058910
38.064907
38.065315
38.075314
38.075665
38.078552
38.122917
38.125946
-38.131565
38.136566
38.232738
38.216042
38.215809
38.231964
38.231445
38.051910
37.797581
38.232738
38.136566
38.160080
38.160442
38.202679
38.227970
38.243217
38.244740
-75.997681
-75.940498
-75.923767
-75.871521
-75.874619
-75.855301
-75.876144
-75.876144
-75.855301
-75.822853
-76.040848
-76.101227
-75.955750
-75.961472
-75.961472
-75.955750
-75.806549
-76.032707
-75.873726
-75.786530
-75.848007
-75.845947
-75.846458
-75.856712
-75.856819
-75.868935
-75.868744
-75.866974
-75.866608
-75.870750
-75.871155
-75.877586
-75.937126
-75.941216
-75.948860
-75.959633
-75.972618
-76.032051
-76.032349
-76.134285
-76.135773
-76.128838
-76.025650
-75.972618
-75.959633
-75.932388
-75.929558
-75.890579
-75.893486
-75.906105
-75.941284
Chesapeake Number of Latitude/
Bay Program Split Longitude Coordinates
Segment Segment to Follow
1300 feet southwest of Wroth Point
East of Ford Landing on Veazey Neck
Town Point
West of where the road north from Randalia ends
East side of Welch Point
Paddy Biddle Cove
0.6 miles south of Elkmore
ELKOH2 3
0.6 miles south of Elkmore
Paddy Biddle Cove
Elkton, 500 feet below Route 7
SASOH SASOH1 4
Grove Point
2850 feet east of Ho wells Point
0.66 miles northwest of Freeman Creek
Cassidy Wharf
SASOH2 3
Cassidy Wharf
0.66 miles northwest of Freeman Creek
350 feet upstream of Route 301
TANMH TANMH1 26
3.25 miles west, 0.3 miles north of Tangier Sound Light
1 miles southeast of south tip of Watts Island, just east of quad boundary
0.57 miles west southwest of flashing red light at tip of Guilford Flats
Eastward Point, on eastern side of Broad Creek
East side of Daugherty Creek Canal
West side of Daugherty Creek Canal
South side of gut southwest of Acre Creek
North side of gut southwest of Acre Creek
700 feet east of Flatcap Point, Janes Island
South shore of Pat Island
Northeast Pat Island, across gut from Hazard Island
Hazard Island, across gut from Pat Island
Gut between Hazard Cove and Mine Creek, south side
Gut between Hazard Cove and Mine Creek, north side
Hazard Island, 1200 feet northeast of tip of Hazard Point
Eastern side of Little Deal Island
Eastern Point on north side of Little Deal Island
Wenona on Deal Island, north of channel
Twiggs Point
Southern-most point of Clay Island
Bishops Head Point
Bishops Head Point
Lower Hooper Island between Nancys and Creek Points
Lower Hooper Island between Nancys and Creek Points
7000 feet north and 2500 feet west of Fog Point, Smith Island
3 miles west northwest of Tangier Sound Light
TANMH2 8
Southern-most point of Clay Island
Twiggs Point
Upper Thorofare, Deal Island side
Upper Thorofare at the mouth of Moores Gut
1 100 feet west of the tip of Long Point
Nanticoke Point (Stump Point Marsh)
West of Waterview, north of Jones Creek
Sandy Island, northeast of Frog Point
continued
appendix b Maryland's and Virginia's CBP Split Segments Boundary Delineations
-------
52
Segment
Description
Manokin River
38.131565
38.125946
38.122917
38.078552
38.075665
38.075314
38.069160
38.069599
38.073784
38.074146
38.133823
38.142979
38.160442
38.160080
38.142979
38.133823
38.172668
Big Annamessex
38.058910
38.036049
38.020973
38.020733
38.016033
38.015781
38.078850
38.074585
38.074146
38.073784
38.069599
38.069160
38.065315
38.064907
38.074585
38.078850
38.087246
Chesapeake Number of Latitude/
Bay Program Split Longitude Coordinates
Segment Segment to Follow
-75.948860
-75.941216
-75.937126
-75.877586
-75.871155
-75.870750
-75.855591
-75.853897
-75.848656
-75.848228
-75.827339
-75.821144
-75.929558
-75.932388
-75.821144
-75.827339
-75.732979
River
-75.868744
-75.868935
-75.856819
-75.856712
-75.846458
-75.845947
-75.782249
-75.787170
-75.848228
-75.848656
-75.853897
-75.855591
-75.866608
-75.866974
-75.787170
-75.782249
-75.733032
MANMH MANMH1
Wenona on Deal Island, north of channel
Eastern point on north side of Little Deal Island
Eastern side of Little Deal Island
Hazard Island, 1200 feet northeast of tip of Hazard Point
Gut between Hazard Cove and Mine Creek, north side
Gut between Hazard Cove and Mine Creek, south side
West part Hazard Island at Shirtpond Cove
East part Hazard Island at Shirtpond Cove
West side of gut heading north from Flatland Cove
East side of gut heading north from Flatland Cove
Cormal Point
Champ Point
Upper Thorofare at the mouth of Moores Gut
Upper Thorofare, Deal Island side
MANMH2
Champ Point
Cormal Point
Manokin River confluence with Hall Branch
BIGMH BIGMH1
South shore of Pat Island
700 feet east of Flatcap Point, Janes Island
North side of gut southwest of Acre Creek
South side of gut southwest of Acre Creek
West side of Daugherty Creek Canal
East side of Daugherty Creek Canal
Persimmon Point
Charles Point
East side of gut heading north from Flatland Cove
West side of gut heading north from Flatland Cove
East part Hazard Island at Shirtpond Cove
West part Hazard Island at Shirtpond Cove
Hazard Island, across gut from Pat Island
Northeast Pat Island, across gut from Hazard Island
BIGMH2
Charles Point
Persimmon Point
1000 feet below confluence with Annemesex Creek
14
3
14
3
VIRGINIA SPLIT SEGMENTS
Upper James River
37.227379 -76.946426
37.241180 -76.945686
37.332580 -77.267880
37.334998 -77.274640
37.329826 -77.281128
37.317638 -77.277275
37.334998
37.332580
37.533394
-77.274640
-77.267880
-77.436775
JMSTF JMSTF1 6
0.3 miles downstream of Sloop Point
Tettington, 500 feet downstream of road to the river
Most western point of Eppes Island
South of Bermuda Hundred, west of substation
Mouth of small creek east of Shand Creek and north of light
City Point, Hopewell
JMSTF2 3
South of Bermuda Hundred, west of substation
Most western point of Eppes Island
Upstream of Mayos Bridge, as far as Browns Island dam
appendix b Maryland's and Virginia's CBP Split Segments Boundary Delineations
-------
53
appendix
2003 Chesapeake Bay Program
Segmentation Scheme
Coordinates Geo-reference and
Narrative Descriptions
Table C-1. Textual description of coordinates bounding the 2003 Chesapeake Bay Program
Segmentation Scheme segments.
Segment
Description
Northern Chesapeake Bay
39.420143 76.123344
39.401688 76.035194
39.429420 75.997681
39.4492
39.529629
39.540794
39.608994
39.608959
39.609001
39.608971
Bush River
39.339172
39.351715
39.482510
Gunpowder River
39.316414
39.312862
39.312767
39.303204
39.412685
39.326569
39.326477
Middle River
39.286442
39.309422
39.326477
39.326569
39.329792
76.007698
75.979271
76.002899
76.121094
76.132683
76.135147
76.143379
76.256592
76.232986
76.215805
76.331039
76.321449
76.321190
76.296249
76.400780
76.361801
76.361130
76.384102
76.342964
76.361130
76.361801
76.446922
Chesapeake
Bay Program
Segment
Number of Latitude/
Longitude Coordinates
to Follow
CB1TF 10
1000 feet southwest of Cherry Tree Point, Aberdeen Proving Ground
North of Chesapeake Haven, Grove Neck
1300 feet southwest of Wroth Point
Turkey Point
Red Point
East side of Carpenter Point
Port Deposit
East side Spencer Island
West side Spencer Island
Just south of Rock Run on western shore
BSHOH
800 feet upriver of Leges Point
Mouth of Abbey Creek
Church Creek, at the railroad tracks
GUNOH
Carroll Island, midway between White Oak and Carroll
Carroll Point
Carroll Point
Rickett Point at end of Ricketts Point Road
Gunpowder Falls, 1500 feet below Route 7
170 feet south of west side of bridge to Carroll Island
170 feet south of east side of bridge to Carroll Island
MIDOH
North shore of Holly Beach
Carroll Island, between Weir Point and Hawthorn Cove
3
7
Points
5
170 feet south of east side of bridge to Carroll Island
170 feet south of west side of bridge to Carroll Island
150 feet downstream of railroad tracks, above Eastern Blvd
^rtTitiwiipn
appendix c 2003 CBP Segmentation Scheme Coordinates Geo-reference and Narrative Descriptions
-------
54
Segment
Description
Upper Chesapeake
39.225143
39.207447
39.372025
39.389511
39.401688
39.420143
39.351715
39.339172
39.303204
39.312767
39.312862
39.316414
39.309422
39.286442
39.248951
39.231178
Back River
39.231178
39.248951
39.307873
Patapsco River
39.131855
39.195377
39.275375
Magothy River
39.039185
39.074715
39.114807
Chesapeake Number of Latitude/
Bay Program Longitude Coordinates
Segment to Follow
Bay
76.408775
76.246994
76.101227
76.040848
76.035194
76.123344
76.232986
76.256592
76.296249
76.321190
76.321449
76.331039
76.342964
76.384102
76.410530
76.408920
76.408920
76.410530
76.520416
76.435081
76.444511
76.654480
76.414330
76.422539
76.548195
Upper Central Chesapeake
38.995991
38.989105
39.016422
39.029720
39.056882
39.054563
39.207447
39.225143
39.195377
39.131855
39.074715
39.039185
Severn River
38.946095
38.976032
39.079697
76.413185
76.330185
76.296959
76.242516
-76.220903
-76.220229
76.246994
76.408775
76.444511
76.435081
76.422539
76.414330
76.455879
76.452377
76.623398
CB2OH 16
North Point State Park, Black Marsh, 1200 feet northeast of small
3000 feet south of Route 21 (Tolchester Beach Road)
2850 feet east of Howells Point
Grove Point
North of Chesapeake Haven, Grove Neck
creek
1000 feet southwest of Cherry Tree Point, Aberdeen Proving Ground
Mouth of Abbey Creek
800 feet upriver of Leges Point
Rickett Point at end of Ricketts Point Road
Carroll Point
Carroll Point
Carroll Island, midway between White Oak and Carroll Points
Carroll Island, between Weir Point and Hawthorn Cove
North shore of Holly Beach
Rocky Point Park, between Claybank and Cedar Points
Swan Point, in line with 1 1th Street
BACOH 3
Swan Point, in line with 1 1th Street
Rocky Point Park, between Claybank and Cedar Points
Moores Run, 1 .25 miles above I 695
PATMH 3
Bodkin Neck between Cedar and Bodkin Points
North Point south of Fort Howard
Gwynns Falls, upstream end of Carroll Park
MAGMH 3
Between Beacon Hill and Tydings on the Bay
East side Gibson Island across from Hapenny Way
End of estuary below Catherine Avenue.
CB3MH 10
500 feet southeast of Moss Pond
0.6 miles northeast of where Route 50 west meets the Bay
Kent Island, 1600 feet north of Grollman Road
Wickes Beach, Eastern Neck Island
South end of Eastern Neck Island, 0.13 miles east of Route 445 bridge
North tip of Eastern Neck Island, 0.13 miles east of Route 445 bridge
3000 feet south of Route 21 (Tolchester Beach Road)
North Point State Park, Black Marsh, 1200 feet northeast of small
North Point south of Fort Howard
Bodkin Neck between Cedar and Bodkin Points
East side Gibson Island across from Hapenny Way
Between Beacon Hill and Tydings on the Bay
SEVMH 3
Bay Ridge, near Bainbridge Avenue
Greenbury Point, 800 feet up east side from the tip
Severn Run, 1 100 feet downstream of Veterans Hwy
creek
continued
appendix c 2003 CBP Segmentation Scheme Coordinates Geo-reference and Narrative Descriptions
-------
55
Segment
Description
South River
38.888672
38.886829
38.907860
38.983105
Rhode River
38.867775
38.864788
38.886829
38.888672
38.883629
West River
38.848892
38.864788
38.867775
38.822258
Middle Central
38.384819
38.393951
38.421051
38.421944
38.487057
38.526997
38.527523
38.672421
38.719185
38.719967
38.752529
38.836365
38.989105
38.995991
38.976032
38.946095
38.907860
38.848892
76.489876
76.475616
76.466240
76.606232
76.519608
76.485870
76.475616
76.489876
76.554649
76.493805
76.485870
76.519608
76.551514
Chesapeake
76.381432
76.282532
76.288589
76.288742
76.331779
76.333771
76.333801
76.340698
76.334084
76.333054
76.340332
76.369392
76.330185
76.413185
76.452377
76.455879
76.466240
76.493805
Chesapeake Number of Latitude/
Bay Program Longitude Coordinates
Segment to Follow
SOUMH 4
Saunders Point, south of Mayo Beach Park
0.8 miles east of Saunders Point
Southern shore of Thomas Point Park
700 feet upstream of Route 50
RHDMH 5
Salt Pond at the mouth of the Rhode River
1 .2 miles east southeast of Dutchman Point
0.8 miles east of Saunders Point
Saunders Point, south of Mayo Beach Park
Muddy Creek, 1200 feet below North and South Forks converge
WSTMH 4
Felicity Cove, 250 feet north of Bay Road
1 .2 miles east southeast of Dutchman Point
Salt Pond at the mouth of the Rhode River
2400 feet downstream of Shady Side
CB4MH 18
Cove Point
Meekins Neck, 800 feet north of Cattail Island
Meekins Neck, across channel from Point #4
Southern tip of Taylors Island
West side of Oyster Cove, Taylors Island
190 feet south of LCHMH Point #3
East edge of tidal flat north of existing James Island
720 feet along shore north northwest of Blackwalnut Point
South side Knapps Narrows, 275 feet west of Route 33
North side Knapps Narrows, 150 feet west of Route 33
1500 feet northeast of Green Marsh Point
Kent Point
0.6 miles northeast of where Route 50 west meets the Bay
500 feet southeast of Moss Pond
Greenbury Point, 800 feet up east side from the tip
Bay Ridge, near Bainbridge Avenue
Southern shore of Thomas Point Park
Felicity Cove, 250 feet north of Bay Road
Western Branch Patuxent
38.784637 76.713326
38.785023 76.712456
38.797241 76.729507
Upper Patuxent River
38.700325
38.700516
38.874958
38.785023
38.784637
76.695824
76.694160
76.677834
76.712456
76.713326
WBRTF 3
Mouth of Western Branch, west side
Mouth of Western Branch, east side
Where Western Branch narrows, north of sewage plant
PAXTF 5
On marshy point 0.5 miles north of Hotschkins Branch
0.8 miles north of Jones Point
Near unnamed stream south of Mt. Nebo Branch
Mouth of Western Branch, east side
Mouth of Western Branch, west side
continued
appendix c 2003 CBP Segmentation Scheme Coordinates Geo-reference and Narrative Descriptions
-------
56
Segment
Description
Chesapeake
Bay Program
Segment
Number of Latitude/
Longitude Coordinates
to Follow
Middle Patuxent River
38.542320 76.678818
38.540684 76.668045
38.700516 76.694160
38.700325 76.695824
Lower Patuxent River
38.304638 76.421448
38.319176 76.420990
38.540684 76.668045
38.542320 76.678818
Lower Central
37.619465
37.797581
38.051910
38.231445
38.248581
38.248642
38.295982
38.298965
38.348228
38.349953
38.393951
38.384819
38.319176
38.304638
38.038605
37.909725
Chesapeake
76.280251
76.025650
76.128838
76.135773
76.153191
76.154419
76.204597
76.206718
76.227264
76.227982
76.282532
76.381432
76.420990
76.421448
76.321442
76.263702
Upper Potomac
38.524181
38.523266
38.554722
38.566856
38.702038
38.711002
38.850609
38.856720
38.979492
Anacostia River
38.856720
38.850609
38.938805
River
77.285294
77.256630
77.220268
77.209755
77.044693
77.036736
77.018761
77.022491
77.227455
77.022491
77.018761
76.942162
Piscataway River
38.711002 77.036736
38.702038 77.044693
38.697979 76.996788
PAXOH
Chalk Point, eastern side
Gods Grace Point near end of Leitchs Wharf Road
0.8 miles north of Jones Point
On marshy point 0.5 miles north of Hotschkins Branch
PAXMH
Fishing Point
Drum Point
Gods Grace Point near end of Leitchs Wharf Road
Chalk Point, eastern side
16
CB5MH
Fleets Island, at end of road north of Windmill Point
3 miles west northwest of Tangier Sound Light
7000 feet north and 2500 feet west of Fog Point, Smith Island
Lower Hooper Island between Nancys and Creek Points
Lower Hooper Island, northeast end of The Thorofare
Middle Hooper Island, northwest end of The Thorofare
Northwest tip of Middle Hooper Island across from Ferry Point
Ferry Point
Drawbridge, northern Upper Hooper Island
Drawbridge, southern Meekins Neck
Meekins Neck, 800 feet north of Cattail Island
Cove Point
Drum Point
Fishing Point
Point Lookout
East of Ophelia, 300 feet northwest of light
POTTF 9
Midway between Shipping Point and the Quantico Pier
1000 feet southwest of Moss Point
Stump Neck, east of radio towers and west of Roach Road
Cornwallis Neck, 0.25 miles northwest of Deep Point
Mockley Point, 500 feet west of tip
West of Ft. Washington
Border between Boiling Air Force Base and U.S. Naval Station
Hains Point
1800 feet upstream of Offutt Island
ANATF 3
Hains Point
Border between Boiling Air Force Base and U.S. Naval Station
100 feet below Bladensburg Road bridge
PISTF 3
West of Ft. Washington
Mockley Point, 500 feet west of tip
Piscataway Creek Park, north of sewage disposal plant
continued
appendix c 2003 CBP Segmentation Scheme Coordinates Geo-reference and Narrative Descriptions
-------
57
Segment
Description
Chesapeake
Bay Program
Segment
Number of Latitude/
Longitude Coordinates
to Follow
Mattawoman Creek
38.566856 77.209755
38.554722 77.220268
38.591194 77.124672
Middle Potomac River
38.389660 77.029305
38.407509 76.997322
38.523266 77.256630
38.524181 77.285294
Lower Potomac River
37.909725 76.263702
38.038605 76.321442
38.407509 76.997322
38.389660 77.029305
Northeast River
39.540794
39.529629
39.608879
Elk River
39.449200
39.429420
39.474773
39.486473
39.523182
39.525536
39.607624
C&D Canal
39.525536
39.523182
39.542904
Bohemia River
39.486473
39.474773
39.461319
Sassafras River
39.389511
39.372025
39.376785
76.002899
75.979271
75.937988
76.007698
75.997681
75.940498
75.923767
75.871521
75.874619
75.822853
75.874619
75.871521
75.724831
75.923767
75.940498
75.783554
76.040848
76.101227
75.806549
MATTF 3
Cornwallis Neck, 0.25 miles northwest of Deep Point
Stump Neck, east of radio towers and west of Roach Road
2300 feet downstream of Routes 224/225 (7.5' quad edge)
POTOH 4
1 mile southeast of Mathias Point, just north of Route 639
0.65 miles northwest of the town of Popes Creek
1000 feet southwest of Moss Point
Midway between Shipping Point and Quantico Pier
POTMH 4
East of Ophelia, 300 feet northwest of light
Point Lookout
0.65 miles northwest of the town of Popes Creek
1 mile southeast of Mathias Point, just north of Route 639
3
Upper Chester River
39.246002 75.986618
39.245350 75.985878
39.254440 75.839638
NORTF
East side of Carpenter Point
Red Point
750 feet above railroad bridge, 1500 feet below Route 40
ELKOH
Turkey Point
1300 feet southwest of Wroth Point
East of Ford Landing on Veazey Neck
Town Point
West of where the road north from Randalia ends
East side of Welch Point
Elkton, 500 feet below Route 7
C&DOH 3
East side of Welch Point
West of where the road north from Randalia ends
North of Summit Bridge and 250 feet east of the power line
BOHOH 3
Town Point
East of Ford Landing on Veazey Neck
600 feet below where Sandy Branch enters
SASOH 3
Grove Point
2850 feet east of Ho wells Point
350 feet upstream of Route 301
CHSTF 3
Travilla Wharf
Marshy point across from Travilla Wharf
Andover Branch 900 feet above Route 313
Middle Chester River
39.147564 76.086426
39.146572 76.075684
39.245350 75.985878
39.246002 75.986618
CHSOH
1100 feet below Browns Creek
Northwest Point, west of Riverview
Marshy point across from Travilla Wharf
Travilla Wharf
continued
appendix c 2003 CBP Segmentation Scheme Coordinates Geo-reference and Narrative Descriptions
-------
58
Segment
Description
Chesapeake
Bay Program
Segment
Number of Latitude/
Longitude Coordinates
to Follow
Lower Chester
39.029720
39.016422
38.970539
38.970455
39.146572
39.147564
39.056882
39.054563
Eastern Bay
38.836365
38.752529
38.970455
38.970539
River
76.242516
76.296959
76.248413
76.246330
76.075684
76.086426
-76.220903
-76.220229
76.369392
76.340332
76.246330
76.248413
Upper Choptank River
38.810635 75.902985
38.808270 75.900391
38.980827 75.792931
Middle Choptank River
38.653545 75.959129
38.647415 75.952339
38.808270 75.900391
38.810635 75.902985
CHSMH 6
Wickes Beach, Eastern Neck Island
Kent Island, 1600 feet north of Grollman Road
Route 50, west side of Kent Narrows
Route 50, east side of Kent Narrows
Northwest Point, west of Riverview
1100 feet below Browns Creek
South end of Eastern Neck Island, 0.13 miles east of Route 445 bridge
North tip of Eastern Neck Island, 0.13 miles east of Route 445 bridge
EASMH 4
Kent Point
1500 feet northeast of Green Marsh Point
Route 50, east side of Kent Narrows
Route 50, west side of Kent Narrows
CHOTF 3
1850 feet downstream from mouth of Tuckahoe Creek
1000 feet downstream of Gilpin Point
3500 feet upstream of Route 313 bridge
CHOOH 4
1.5 miles downstream of Bow Knee Point
1.05 miles upstream of Cabin Creek
1000 feet downstream of Gilpin Point
1850 feet downstream from mouth of Tuckahoe Creek
Lower Choptank River
38.672421
38.571705
38.573353
38.628571
38.649193
38.719967
38.719185
76.340698
76.336029
76.306503
76.171051
76.153114
76.333054
76.334084
Mouth of Choptank River
38.649193 76.153114
38.628571 76.171051
38.647415 75.952339
38.653545 75.959129
CHOMH1 7
720 feet along shore north northwest of Blackwalnut Point
Hills Point
1.6 miles almost due west of Hills Point
400 feet west of Castle Haven Point
0.9 miles north of Chlora Point
North side Knapps Narrows, 150 feet west of Route 33
South side Knapps Narrows, 275 feet west of Route 33
CHOMH2 4
0.9 miles north of Chlora Point
400 feet west of Castle Haven Point
1.05 miles upstream of Cabin Creek
1.5 miles downstream of Bow Knee
Little Choptank River LCHMH 9
38.573353 76.306503 1.6 miles almost due west of Hills Point
38.571705 76.336029 Hills Point
38.527523 76.333801 East edge of tidal flat north of existing James Island
38.526997 76.333771 190 feet south of LCHMH Point #3
38.487057 76.331779 West side of Oyster Cove, Taylors Island
38.421944 76.288742 Southern tip of Taylors Island
38.421051 76.288589 Meekins Neck, across channel from Point #6
38.398201 76.237053 West shore Great Marsh Creek 1800 feet above Route 335
38.398605 76.237030 East shore Great Marsh Creek 1800 feet above Route 335
continued
appendix c 2003 CBP Segmentation Scheme Coordinates Geo-reference and Narrative Descriptions
-------
59
Segment
Description
Honga River
38.231964
38.215809
38.398605
38.398201
38.349953
38.348228
38.298965
38.295982
38.248642
38.248581
Fishing Bay
38.216042
38.232738
38.404148
38.404133
Chesapeake Number of Latitude/
Bay Program Longitude Coordinates
Segment to Follow
76.134285
76.032349
76.237030
76.237053
76.227982
76.227264
76.206718
76.204597
76.154419
76.153191
76.032051
75.972618
76.002716
76.029968
HNGMH
Lower Hooper Island between Nancys and Creek Points
Bishops Head Point
10
Great Marsh Creek, north side, 1900 feet above Route 335
Great Marsh Creek, south side, 1900 feet above Route 335
Drawbridge, southern Meekins Neck
Drawbridge, northern Upper Hooper Island
Ferry Point
Northwest tip of Middle Hooper Island across from Ferry
Middle Hooper Island, northwest end of The Thorofare
Lower Hooper Island, northeast end of The Thorofare
FSBMH
Bishops Head Point
Southern most point of Clay Island
Transquaking River west of Thorofare Marsh
Backgarden Pond, southeast shore
Point
4
Upper Nanticoke River
38.538052 75.745972
38.536259 75.744843
38.642723 75.606522
Middle Nanticoke River
38.387169 75.859673
38.381268 75.839233
38.536259 75.744843
38.538052 75.745972
38.553452 75.774071
Lower Nanticoke River
38.24474
38.243217
38.381268
38.387169
Wicomico River
38.227970
38.202679
38.361588
Tangier Sound
37.792580
37.781960
37.846237
37.924927
38.015781
38.016033
38.020733
38.020973
38.036049
38.058910
38.064907
38.065315
75.941284
75.906105
75.839233
75.859673
75.893486
75.890579
75.583061
76.032707
75.873726
75.786530
75.848007
75.845947
75.846458
75.856712
75.856819
75.868935
75.868744
75.866974
75.866608
NANTF 3
600 feet upstream of Molly Horn Branch
375 feet upstream of Plum Creek
Seaford, Delaware just above Middleford Road
NANOH 5
900 feet downstream of Wapremander Creek
600 feet upstream of Quantico Creek
375 feet upstream of Plum Creek
600 feet upstream of Molly Horn Branch
Marshyhope Creek, 500 feet downstream of Big Indian
NANMH 4
Sandy Island, northeast of Frog Point
West of Waterview, north of Jones Creek
600 feet upstream of Quantico Creek
900 feet downstream of Wapremander Creek
WICMH 3
Nanticoke Point (Stump Point Marsh)
1100 feet west of the tip of Long Point
Beaverdam Creek, 3000 feet upstream of Route 12
TANMH 31
3.25 miles west, 0.3 miles north of Tangier Sound Light
1 mile southeast of south tip of Watts Island, just east of quad boundary
0.57 miles west southwest of flashing red light at tip of Guilford Flats
Eastward Point, on eastern side of Broad Creek
East side of Daugherty Creek Canal
West side of Daugherty Creek Canal
South side of gut southwest of Acre Creek
North side of gut southwest of Acre Creek
700 feet east of Flatcap Point, Janes Island
South shore of Pat Island
Northeast Pat Island, across gut from Hazard Island
Hazard Island, across gut from Pat Island
continued
appendix c 2003 CBP Segmentation Scheme Coordinates Geo-reference and Narrative Descriptions
-------
60
Segment
Description
38.075314
38.075665
38.078552
38.122917
38.125946
38.131565
38.160080
38.160442
38.202679
38.227970
38.243217
38.244740
38.232738
38.216042
38.215809
38.231964
38.231445
38.051910
37.797581
Manokin River
38.131565
38.125946
38.122917
38.078552
38.075665
38.075314
38.069160
38.069599
38.073784
38.074146
38.172668
38.160442
38.160080
Big Annemessex
38.058910
38.036049
38.020973
38.020733
38.016033
38.015781
38.087246
38.074146
38.073784
38.069599
38.069160
38.065315
38.064907
75.870750
75.871155
75.877586
75.937126
75.941216
75.948860
75.932388
75.929558
75.890579
75.893486
75.906105
75.941284
75.972618
76.032051
76.032349
76.134285
76.135773
76.128838
76.025650
75.948860
75.941216
75.937126
75.877586
75.871155
75.870750
75.855591
75.853897
75.848656
75.848228
75.732979
75.929558
75.932388
River
75.868744
75.868935
75.856819
75.856712
75.846458
75.845947
75.733032
75.848228
75.848656
75.853897
75.855591
75.866608
75.866974
Chesapeake Number of Latitude/
Bay Program Longitude Coordinates
Segment to Follow
Gut between Hazard Cove and Mine Creek, south side
Gut between Hazard Cove and Mine Creek, north side
Hazard Island, 1200 feet northeast of tip of Hazard Point
Eastern side of Little Deal Island
Eastern point on north side of Little Deal Island
Wenona on Deal Island, north of channel
Upper Thorofare, Deal Island side
Upper Thorofare at the mouth of Moores Gut
1100 feet west of the tip of Long Point
Nanticoke Point (Stump Point Marsh)
West of Waterview, north of Jones Creek
Sandy Island, northeast of Frog Point
Southern most point of Clay Island
Bishops Head Point
Bishops Head Point
Lower Hooper Island between Nancys and Creek Points
Lower Hooper Island between Nancys and Creek Points
7000 feet north and 2500 feet west of Fog Point, Smith Island
3 miles west northwest of Tangier Sound Light
MANMH 14
Wenona on Deal Island, north of channel
Eastern point on north side of Little Deal Island
Eastern side of Little Deal Island
Hazard Island, 1200 feet northeast of tip of Hazard Point
Gut between Hazard Cove and Mine Creek, north side
Gut between Hazard Cove and Mine Creek, south side
West part Hazard Island at Shirtpond Cove
East part Hazard Island at Shirtpond Cove
West side of gut heading north from Flatland Cove
East side of gut heading north from Flatland Cove
Manokin River confluence with Hall Branch
Upper Thorofare at the mouth of Moores Gut
Upper Thorofare, Deal Island side
BIGMH 13
South shore of Pat Island
700 feet east of Flatcap Point, Janes Island
North side of gut southwest of Acre Creek
South side of gut southwest of Acre Creek
West side of Daugherty Creek Canal
East side of Daugherty Creek Canal
1000 feet below confluence with Annemesex Creek
East side of gut heading north from Flatland Cove
West side of gut heading north from Flatland Cove
East part Hazard Island at Shirtpond Cove
West part Hazard Island at Shirtpond Cove
Hazard Island, across gut from Pat Island
Northeast Pat Island, across gut from Hazard Island
continued
appendix c 2003 CBP Segmentation Scheme Coordinates Geo-reference and Narrative Descriptions
-------
61
Segment
Description
Chesapeake
Bay Program
Segment
Number of Latitude/
Longitude Coordinates
to Follow
Upper Pocomoke River
38.062958 75.617470
38.062840 75.616302
38.183201 75.391991
Middle Pocomoke River
37.966858 75.674603
37.941841 75.677261
38.062840 75.616302
38.062958 75.617470
Lower Pocomoke River
37.924927
37.806671
37.806152
37.787926
37.941841
37.966858
75.848007
75.755676
75.755272
75.741074
75.677261
75.674603
POCTF 3
West of Unionville, Somerset County side
West of Unionville, Worcester County side
Snow Hill, 1900 feet upstream of Route 12
POCOH 4
On mainland 4000 feet northwest of Fair Island
Between Pig Point and Shad Landing
West of Unionville, Worcester County side
West of Unionville, Somerset County side
POCMH 7
Eastward Point, on eastern side of Broad Creek
Scott Island, west side
Scott Island, south side
South of Webb Island, between Deep Creek and Doe Creek
Between Pig Point and Shad Landing
On mainland 4000 feet northwest of Fair Island
Western Lower Chesapeake Bay CB6PH 11
37.084686 76.271126 900 feet southwest of abandoned lighthouse north northeast of Grand View
37.087894 76.268974 400 feet northeast of abandoned lighthouse north northeast of Grand View
37.083694 76.165154 6 miles east of Grand View, 10.2 miles west of Fishermans Island
37.729496 76.123352 10 miles east of Hughlett Point, approximately 1 mile north of wreck
37.619465 76.280251 Fleets Island, at end of road north of Windmill Point
37.613708 76.280586 Windmill Point
37.512447 76.285423 Gwynn Island, east side of northern end
37.473808 76.263008 Gwynn Island, 0.25 miles northeast of Sandy Point tip
37.462313 -76.257705 0.08 miles north northeast from northern tip of Rigby Island
37.459854 76.257225 Rigby Island, east side of northern end
37.309418 76.275558 North side of Deep Creek, north of New Point Comfort
37.105408 76.283676 East side of Northend Point
Eastern Lower Chesapeake Bay CB7PH 11
37.083694 76.165154 6 miles east of Grand View, 10.2 miles west of Fishermans Island
37.010635 75.965233 5 miles south of Fishermans Island, 6.3 miles northeast of Cape Henry
37.111908 75.933571 0.68 miles west of Smith Island, 2 miles east of Route 13
37.115574 75.970390 300 feet due north of light in channel, 260 feet west of Route 13
37.787926 75.741074 South of Webb Island, between Deep Creek and Doe Creek
37.806152 75.755272 Scott Island, south side
37.806671 75.755676 Scott Island, west side
37.846237 75.786530 0.57 miles southwest of flashing red light at tip of Guilford Flats
37.781960 75.873726 1 mile southeast of south tip ofWatts Island, just east of quad boundary
37.792580 76.032707 3.25 miles west, 0.3 miles north of Tangier Sound Light
37.729496 76.123352 10 miles east of Hughlett Point, approximately 1 mile north of wreck
Mouth of the Chesapeake Bay CB8PH 9
36.967342 76.296967 Where I 64 south meets Willoughby Spit
36.907486 76.093224 West side of Lesner Bridge (Route 60)
36.907352 76.090591 East side of Lesner Bridge (Route 60)
36.919083 75.993782 Fort Story, 2000 feet north of North Virginia Beach
37.010635 75.965233 5 miles south of Fishermans Island, 6.3 miles northeast of Cape Henry
37.083694 76.165154 6 miles east of Grand View, 10.2 miles west of Fishermans Island
37.087894 76.268974 400 feet northeast of abandoned lighthouse north northeast of Grand View
continued
appendix c 2003 CBP Segmentation Scheme Coordinates Geo-reference and Narrative Descriptions
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62
Segment
Description
37.084686
37.017586
37.002299
76.271126
76.297104
-76.300643
Chesapeake Number of Latitude/
Bay Program Longitude Coordinates
Segment to Follow
900 feet southwest of abandoned lighthouse north northeast of Grand View
Fort Monroe Military Reservation, west of Thimble Shoal
0.32 miles east northeast of Old Point Comfort lighthouse
Upper Rappahannock River
38.082386 76.979980
38.089813 76.973442
38.312946 77.462326
Middle Rappahannock River
37.979389 76.924652
37.988907 76.895859
Point
38.089813 76.973442
38.082386 76.979980
Lower Rappahannock River
37.558598
37.558395
37.613708
37.653767
37.649799
37.988907
37.979389
76.297974
76.283516
76.280586
76.457794
76.496513
76.895859
76.924652
Corrotoman River
37.649799 76.496513
37.653767 76.457794
37.769997 76.478516
Piankatank River
37.473808
37.512447
37.558395
37.558598
37.577724
37.459854
37.462313
76.263008
76.285423
76.283516
76.297974
76.583008
76.257225
-76.257705
Upper Mattaponi River
37.656723 76.882187
37.658237 76.881470
37.788898 77.104210
Lower Mattaponi River
37.538822 76.791504
37.537014 76.786194
37.658237 76.881470
37.656723 76.882187
Upper Pamunkey River
37.543476
37.543507
37.689621
76.976799
76.974968
77.214119
RPPTF 3
430 feet east of the mouth of Hutchinson Swamp
0.7 miles upstream of Peedee Creek
Fredericksburg, 300 feet above aqueduct
RPPOH 4
1000 feet downstream (southeast) of Jenkins Landing
Mulberry Island, 0.33 miles upstream (northwest) of Mulberry
0.7 miles upstream of Peedee Creek
430 feet east of the mouth of Hutchinson Swamp
RPPMH 7
Stingray Point
0.8 miles east of Stingray Point (point 1)
Windmill Point
0.5 miles northwest of Orchard Point
Approximately 0.25 miles south of Whitehouse Creek mouth
Mulberry Island, 0.33 miles upstream (northwest) of Mulberry Point
1000 feet downstream (southeast) of Jenkins Landing
CRRMH 3
Approximately 0.25 miles south of Whitehouse Creek mouth
0.5 miles northwest of Orchard Point
Western Branch, 400 feet upstream of Route 3
PIAMH 6
Gwynn Island, 0.25 miles northeast of Sandy Point tip
Gwynn Island, east side of northern end
0.8 miles east of Stingray Point (RPPMH point 1)
Stingray Point
Dragon Swamp, 0.5 miles below Zion Branch
Rigby Island, east side of northern end
0.08 miles north northeast from northern tip of Rigby Island
MPNTF 3
Across the river from Courthouse Landing
1000 feet upstream of Mitchell Hill Creek
Aylett, 800 feet above Route 360 bridge
MPNOH 4
Lord Delaware Bridge (Route 33), West Point side
Lord Delaware Bridge (Route 33), east side
1000 feet upstream of Mitchell Hill Creek
Across the river from Courthouse Landing
PMKTF 3
0.75 miles upstream of creek at Cook Landing
Cohoke Marsh, 0.9 miles downstream of Turkey Creek
2000 feet upstream of Totopotomoy Creek
continued
appendix c 2003 CBP Segmentation Scheme Coordinates Geo-reference and Narrative Descriptions
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63
Segment
Description
Chesapeake
Bay Program
Segment
Number of Latitude/
Longitude Coordinates
to Follow
Lower Pamunkey River
37.532749 76.810616
37.535069 76.805229
37.543507 76.974968
37.543476 76.976799
Middle York River
37.288246
37.316483
37.537014
37.538822
37.535069
37.532749
Lower York River
37.223167
37.262413
37.316483
37.288246
Mobjack Bay
37.105408
37.309418
37.262413
37.223167
76.598122
76.577034
76.786194
76.791504
76.805229
76.810616
76.420166
76.390877
76.577034
76.598122
76.283676
76.275558
76.390877
76.420166
Upper James River
37.227379 76.946426
37.241180 76.945686
37.533394 77.436775
37.329826 77.281128
37.317638 77.277275
Appomattox River
37.317638 77.277275
37.329826 77.281128
37.233662 77.407867
Middle James River
37.154785
37.202007
37.245670
37.245888
37.241180
37.227379
76.670403
76.626305
76.871529
76.897522
76.945686
76.946426
Chickahominy River
37.245888 76.897522
37.245670 76.871529
37.429108 77.028267
PMKOH 4
Eltham Bridge (Routes. 30/33), west side
Eltham Bridge (Routes 30/33), east side (West Point)
Cohoke Marsh, 0.9 miles downstream of Turkey Creek
0.75 miles upstream of creek at Cook Landing
YRKMH 6
Naval Supply Center, Cheatham Annex
Blundering Point, 1000 feet northwest of tip
Lord Delaware Bridge (Route 33), east side
Lord Delaware Bridge (Route 33), West Point side
Eltham Bridge (Routes 30/33), east side (West Point)
Eltham Bridge (Routes 30/33), west side
YRKPH 4
Sandbox, northeast tip of Goodwin Neck
Jenkins Neck, between Hog Island and Sandy Point
Blundering Point, 1000 feet northwest of tip
Naval Supply Center, Cheatham Annex
MOBPH 4
East side of Northend Point
North side of Deep Creek, north of New Point Comfort
Jenkins Neck, between Hog Island and Sandy Point
Sandbox, northeast tip of Goodwin Neck
JMSTF 5
0.3 miles downstream of Sloop Point
Tettington, 500 feet downstream of road to the river
Upstream of Mayos Bridge, as far as Browns Island dam
Mouth of small creek east of Shand Creek and north of light
City Point, Hopewell
APPTF 3
City Point, Hopewell
Mouth of small creek east of Shand Creek and north of light
Petersburg, 1500 feet upstream of Route 1 bridge
JMSOH 6
0.7 miles north of Hunnicut Creek, south of Hog Island
Near Carters Grove Home, 1.25 miles southeast of Grove Creek
1300 feet north northwest of Barrets Point
During Point
Tettington, 500 feet downstream of road to the river
0.3 miles downstream of Sloop Point
CHKOH 3
During Point
1300 feet north northwest of Barrets Point
Above Holly Landing, 150 feet below temporary divergence
continued
appendix c 2003 CBP Segmentation Scheme Coordinates Geo-reference and Narrative Descriptions
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64
Segment
Description
Chesapeake
Bay Program
Segment
Number of Latitude/
Longitude Coordinates
to Follow
Lower James River
36.923653 76.385788
36.964985 76.410645
37.202007 76.626305
37.154785 76.670403
Mouth of James River
36.967342
37.002299
37.017586
36.964985
36.923653
36.923153
36.925476
76.296967
-76.300643
76.297104
76.410645
76.385788
76.354614
76.329292
Western Branch Elizabeth River
36.856030 76.331711
36.860474 76.341103
36.818913 76.399612
Southern Branch Elizabeth River
36.839340 76.290077
36.839539 76.295753
36.723557 76.248955
Eastern Branch Elizabeth River
36.843090 76.289368
36.839779 76.289261
36.827354 76.167595
JMSMH 4
Northwest corner of Craney Island Disposal Area
Newport News Point, just south of Lincoln Park
Near Carters Grove Home, 1.25 miles southeast of Grove Creek
0.7 miles north of Hunnicut Creek, south of Hog Island
JMSPH 6
Where I 64 S meets Willoughby Spit
0.32 miles east northeast of Old Point Comfort lighthouse
Fort Monroe Military Reservation, west of Thimble Shoal
Newport News Point, just south of Lincoln Park
Northwest corner of Craney Island Disposal Area
Northeast corner of Craney Island Disposal Area
Northwest side of pond 1950 feet south of Sewells Point Docks
WBEMH 3
Pinner Point, northwest corner at railroad tracks
Lovett Point, southeast corner
1800 feet south of Hodges Ferry Bridge (Route 337)
SBEMH 3
930 feet west of the south end of Berkley Bridge
250 feet south of light and 2500 feet north of Downtown Tunnel
Great Bridge Lock
EBEMH 3
The Waterside
700 feet west of the south end of Berkley Bridge
300 feet downstream of Route 165
Lafayette River LAFMH 3
36.903587 76.323219 Tanners Point
36.901581 76.314362 1400 feet due east of light southeast of Tanners Point
36.865322 76.257843 Calvary Cemetery, 3400 feet upstream of Route 168
Mouth to mid-Elizabeth River ELIPH 10
36.925476 76.329292 Northwest side of pond 1950 feet south of Sewells Point Docks
36.923153 76.354614 Northeast corner of Craney Island Disposal Area
36.860474 76.341103 Lovett Point, southeast corner
36.856030 76.331711 Pinner Point, northwest corner at railroad tracks
36.839539 76.295753 250 feet south of light and 2500 feet north of Downtown Tunnel
36.839340 76.290077 930 feet west of the south end of Berkley Bridge
36.839779 76.289261 700 feet west of the south end of Berkley Bridge
36.843090 76.289368 The Waterside
36.901581 76.314362 1400 feet due east of light southeast of Tanners Point
36.903587 76.323219 Tanners Point
Lynnhaven River
36.907352 76.090591
36.907486 76.093224
LYNPH
East side of Lesner Bridge (Route 60)
West side of Lesner Bridge (Route 60)
appendix c 2003 CBP Segmentation Scheme Coordinates Geo-reference and Narrative Descriptions
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