U.S. ENVIRONMENTAL PROTECTION AGENCY
NATIONAL EUTROPHICATION SURVEY
WORKING PAPER SERIES
REPORT
ON
LAKE COLORADO CITY
MITCHELL COUNTY
TEXAS
EPA REGION VI
WORKING PAPER No,
CORVALLIS ENVIRONMENTAL RESEARCH LABORATORY - CORVALL1S, OREGON
and
ENVIRONMENTAL MONITORING & SUPPORT LABORATORY - LAS VEGAS, NEVADA
•&G.P.O. 699-440
-------
REPORT
ON
LAKE COLORADO CITY
MITCHELL COUNTY
TEXAS
EPA REGION VI
WORKING PAPER No, 640
WITH THE COOPERATION OF THE
TEXAS WATER QUALITY BOARD
AND THE
TEXAS NATIONAL GUARD
FEBRUARY/ 1977
-------
CONTENTS
Page
Foreward ii
List of Texas Study Reservoirs iv
Lake and Drainage Area Map vi
Sections
I. Conclusions 1
II. Lake and Drainage Basin Characteristics . 3
III. Lake Water Quality Summary 4
IV. Nutrient Loadings 9
V. Literature Reviewed 13
VI. Appendices 14
-------
11
FOREWORD
The National Eutrophication Survey was initiated in 1972 in
response to an Administration commitment to investigate the nation-
wide threat of accelerated eutrophication to freshwater lakes and
reservoirs.
OBJECTIVES
The Survey was designed to develop, in conjunction with state
environmental agencies, information on nutrient sources, concentrations,
and impact on selected freshwater lakes as a basis for formulating
comprehensive and coordinated national, regional, and state management
practices relating to point-source discharge reduction and non-point
source pollution abatement in lake watersheds.
ANALYTIC APPROACH
The mathematical and statistical procedures selected for the
Survey's eutrophication analysis are based on related concepts that:
a. A generalized representation or model relating
sources, concentrations, and impacts can be constructed.
b. By applying measurements of relevant parameters
associated with lake degradation, the generalized model
can be transformed into an operational representation of
a lake, its drainage basin, and related nutrients.
c. With such a transformation, an assessment of the
potential for eutrophication control can be made.
LAKE ANALYSIS
In this report, the first stage of evaluation of lake and water-
shed data collected from the study Take and its drainage basin is
documented. The report is formatted to provide state environmental
agencies with specific Information for basin planning [§303(e)], water
quality criteria/standards review [§303(c)], clean lakes [§314(a,b)],
and water quality monitoring [§106 and §305(b)] activities mandated
by the Federal Water Pollution Control Act Amendments of 1972.
-------
m
Beyond the single lake analysis, broader based correlations
between nutrient concentrations (and loading) and trophic condi-
tion are being made to advance the rationale and data base for
refinement of nutrient water quality criteria for the Nation's
fresh water lakes. Likewise, multivariate evaluations for the
relationships between land use, nutrient export, and trophic
condition, by lake class or use, are being developed to assist
in the formulation of planning guidelines and policies by EPA
and to augment plans implementation by the states.
ACKNOWLEDGEMENT
The staff of the National Eutrophication Survey (Office of
Research & Development, U. S. Environmental Protection Agency)
expresses sincere appreciation to the Texas Water Quality Board
for professional involvement, to the Texas National Guard for
conducting the tributary sampling phase of the Survey, and to
those Texas wastewater treatment plant operators who voluntarily
provided effluent samples.
Hugh C. Yantis, Jr., Executive Director of the Texas Water
Quality Board, and John B. Latchford, Jr., Director, and the staff
of the Field Operations Division provided invaluable lake documen-
tation and counsel during the Survey, reviewed the preliminary
reports, and provided critiques most useful in the preparation of
this Working Paper series.
Major General Thomas Bishop, the Adjutant General of Texas,
and Project Officer Colonel William L. Seals, who directed the
volunteer efforts of the Texas National Guardsmen, are also grate-
fully acknowledged for their assistance to the Survey.
-------
1v
NATIONAL EUTROPHICATION SURVEY
STUDY RESERVOIRS
State of Texas
NAME
Amistad
Bastrop
Bel ton
Braunig
Brownwood
Buchanan
Caddo
Calaveras
Canyon
Colorado City
Corpus Christi
Diversion
Eagle Mountain
Fort Phantom Hill
Houston
Kemp
Lake O'The Pines
Lavon
Lewisville (Garza-Little Elm)
Livingston
COUNTY
Val Verde
Bastrop
Bell, Coryell
Bexar
Brown
Burnet, Llano
Harrison, Marion, TX;
Caddo Parish, LA
Bexar
Comal
Mitchell
Jim Wells, Live Oak, San
Patricio
Archer, Baylor
Tarrant, Wise
Jones
Harris
Baylor
Camp, Marion, Morris,
Upshur
Collin
Denton
Polk, San Jacinto, Trinity,
Waiker
-------
Lyndon B. Johnson
Medina
Meredith
0. C. Fisher (San Angelo)
Palestine
Possum Kingdom
Sam Rayburn
Somervilie
E. V. Spence
Stamford
Stillhouse Hollow
Tawakoni
Texoma
Travis
Trinidad
Twin Buttes
White River
Whitney
Wright Patman (Texarkana)
Burnet, Llano
Bandera, Medina
Hutchinson, Moore,
Potter
Tom Green
Anderson, Cherokee,
Henderson, Smith
Palo Pinto, Stephens,
Young
Angelina, Jasper
Nacogdoches, Sabine, San
Augustine
Burleson, Lee, Washington
Coke
Haskell
Bell
Hunt, Rains, Van Zandt
Cooke, Grayson TX; Bryan,
Johnston, Love, Marshall, OK
Burnet, Travis
Henderson
Tom Green
Crosby
Bosque, Hill
Bowie, Cass
-------
LAKE COLORADO CITY
Tributary Sampling Site
X Lake Sampling Site
^} Drainage Area Boundary
<69 Km.
T~SsI MI.
Sc^le
icno
Wl'OO
-------
LAKE COLORADO CITY
STORE! NO. 4810
I. CONCLUSIONS
A. Trophic Condition:
Survey data indicate that Lake Colorado City i~. eutrophic;
i.e., well supplied with nutrients and quite productive. Whether
nutrient enrichment is beneficial or deleterious depends on the
actual or potential effect on the uses of the lake. In this
regard, no nuisance conditions are known to personnel of the
Texas Water Quality Board, and there is little or no impairment
of the designated beneficial uses of this lake.
Lake Colorado City ranked twentieth in overall trophic quality
when the 39 Texas reservoirs sampled in 1974 were compared using
Q combination of six parameters*. Twenty-two of the water bodies
had less and two had the same median total and median dissolved
phosphorus, eight had less and two had the same median inorganic
nitrogen, 22 had less mean chlorophyll a_, and 28 had greater mean
Secchi disc transparency.
Survey limnologists did not observe algal blooms or macrophytes
in the lake during sampling visits.
B. Rate-Limiting Nutrient:
The algal assay results indicate that nitrogen was limiting at
the time the sample was taken (10/28/74).
The lake data indicate nitrogen limitation in March and October
but phosphorus limitation in May.
See Appendix A.
-------
C. Nutrient Controllability:
1. Point sources--No known municipal or industrial point
sources impacted Lake Colorado City during the sampling year.
Septic tanks serving lakeshore dwellings are estimated to have
contributed 8.3% of the total phosphorus load to the lake; however,
a shoreline survey would be needed to determine the actual con-
tributions of these sources.
The phosphorus loading of 0.21 g/m2 measured during the sampling
year is a little more than that proposed by Vollenweider (Vollen-
weider and Dillon, 1974) as a eutrophic loading (see page 12).
Regardless of the applicability of Vollenweider1s eutrophic level
to Texas reservoirs, the lake is eutrophic, and all phosphorus
inputs should be reduced to the greatest practicable degree.
2. Non-point sources—The phosphorus contributions of non-point
sources, including precipitation, accounted for nearly 92% of the
total load reaching the lake during the sampling year. Morgan Creek
contributed 66.5%, Unnamed Stream B-l contributed 6.8%, and the
ungaged drainage area was estimated to have contributed 10.1% of the
total phosphorus load.
The phosphorus export rates of Morgan Creek and Unnamed Stream
B-l were 1 and 4 kg/km2/yr, respectively (see page 11). These rates
are quite low compared to the rate of a tributary to nearby Lake
Stamford* (28 kg/km2/yr).
* Working Paper No. 660.
-------
II. LAKE AND DRAINAGE BASIN CHARACTERISTICS1
A. Lake Morphometry :
1. Surface area: 6.52 kilometers2.
2. Mean depth: 6.0 meters.
3. Maximum depth: >8.2 meters.
4. Volume: 39.120 x 106 m3.
5. Mean hydraulic retention time: 3.9 years (based on outflow),
B. Tributary and Outlet:
(See Appendix C for flow data)
1. Tributaries -
Drainage Mean flow
Name area (km2)* (m3/sec)*
Morgan Creek 709.7 0.282
Unnamed Stream B-l 26.4 0.011
Minor tributaries &
immediate drainage - 91.4 0.043
Totals 827.5 0.336
2. Outlet -
Morgan Creek 834.0** 0.321
C. Precipitation***:
1. Year of sampling: 57.9 centimeters.
2. Mean annual: 50.0 centimeters.
t Table of metric conversions—Appendix B.
tt Latchford, 1974.
* For limits of accuracy, see Working Paper No. 175, "...Survey Methods,
1973-1976".
** Includes area of lake.
*** See Working Paper No. 175.
-------
III. LAKE WATER QUALITY SUMMARY
Lake Colorado City was sampled four times during 1974 by means of a
pontoon-equipped Huey helicopter. Each time, samples for physical and '
chemical parameters were collected from two stations on the lake and from
a number of depths at each station (see map, page vi). During each visit,
a single depth-integrated (4.6 m or near bottom to surface) sample was
composited from the stations for phytoplankton identification and enumer-
ation; and during the October visit, a single 18.9-liter depth-integrated
sample was composited for algal assays. Also each time, a depth-integrated
sample was collected from each of the stations for chlorophyll a_ analysis.
The maximum depths sampled were 8.2 meters at station 1 and 4.9 meters at
station 2.
The sampling results are presented in full in Appendix D and are
summarized in the following table (the August nutrient samples were not
preserved properly and were not analyzed).
-------
PARAMETER
TEMP (C)
DISS OXY (MG/L)
CNDCTVY (MCROMO)
PH (STAND UNITS)
TOT ALK (MG/L)
TOT P (MG/L)
ORTHO P (MG/L)
N02»N03 (MG/L)
AMMONIA (MG/L)
KJEL N (MG/L)
INORG N (MG/L)
TOTAL N (MG/L)
CHLRPYL A
SECCHI (METERS)
A. SUMMARY OF PHYSICAL AND
1ST SAMPLING ( 3/ 4/74)
2 SITES
RANGE
14.2 - 21.5
6.8 - 8.0
1396. - 1640.
8.2 - 8.5
152. - 164.
0.021 - 0.046
0.009 - 0.019
0.020 - 0.070
0.030 - 0.090
0.600 - 0.900
0.050 - 0.130
0.620 - 0.940
6.<. - 6.5
0.8 - 1.1
CHEMICAL CHARACTERISTICS FOH LAKE COLORADO CITY
STCRET CODE 4310
2ND SAMPLING ( 5/15/74)
2 SITES
3RD SAMPLING ( 8/ 6/74)
2 SITES
MEAN
18.1
7.5
1543.
8.4
161.
0*026
0.013
0.040
0.046
0.714
0.086
0.754
6.4
0.9
MEDIAN
18.6
7.8
1545.
8.4
163. •
0.023
0.013
0.04U
0.030
0.700
0.080
0.730
6.4
0.9
RANGE
25.9
6.0
2049.
7.8
138.
0.035
0.006
0.030
0.040
0.700
0.070
0.780
7.3
0.4
- 29.2
7.0
- 2212.
8.3
- 148.
- 0.055
- 0.009
- 0.190
- 0.160
- 1.300
- 0.350
- 1.390
7. to
0.4
MEAN
27.8
6.*
2138.
8.2
142.
0.044
0.008
0.093
0.076
0.886
0.169
0.979
7.4
0.4
MEDIAN
27.5
6.2
2144.
8.3
141.
0.042
0.008
0.080
0.070
0.800
0.150
0.900
7.4
0.4
RANGE MEAN MEDIAN
27.8 - 30.5 29.3 29.2
4.8 - 6.2 5.7 5.8
2490. - 2584. 2546. 2546.
8.1 - 8.9 8.3 8.2
*..... ..*..**....*.....«.*.•«
••• .*...............
...... -..*......*............
e»«O»» _««««««..»..««»»«•«»«.«
..,»<,<, .......................
«*««»» _
-------
A. SUMMARY OF PHYSICAL AND CHEMICAL CHARACTERISTICS FOR LAKE COLORADO cm
STOrtET CODE 4810
4TH SAMPLING (10/28/74)
PARAMETER
TEMP (C)
OISS OXY (MG/LI
CNOCTVY (MCSOMO)
PH (STAND UNITS)
TOT ALK (MG/L)
TOT P (MG/L)
ORTHO P (MG/L>
N02 + N03 (MG/L)
AMMONIA (MG/D
KJEL N (MG/L)
INORG N (MG/D
TOTAL N (MG/L)
CHLRPYL A (UG/D
SECCHI (METERS)
SANGE
21.0 - 23.1
6.4 -
1166. - 1517.
8.4 -
109. - 118.
0.042 - 0.074
0.012 - 0.026
0.020 - 0.060
0.030 - 0.040
0.600 - 0.800
0.050 - 0.100
0.660 - 0.820
16.2 - 20.5
0.5 -
? SITES
MEAN
1
4
5
1.
'4
!6
iO
•0
10
'0
!0
5
7
21.8
6.8
1353.
8.4
114.
0.055
0.018
0.039
0.033
0.686
0.071
0.724
18.3
0.6
MEDIAN
21.5
6.8
1453.
8.4
115.
0.046
0.017
0.030
0.030
0.700
0.060
0.720
10.3
0.6
-------
B. Biological characteristics:
1. Phytoplankton -
Sampling
Date
03/04/74
05/15/74
08/06/74
10/28/74
Dominant
Genera
1.
2.
3.
4.
5.
1.
2.
3.
4.
5.
1.
2.
3.
4.
5.
1.
2.
3.
4.
5.
Diploneis sp.
Oscillatoria sp.
Flagellates
Synedra sp.
Dactyl ococcops is sp,
Other genera
Total
Tetraedron sp.
Chroomonas sp.
Diploneis sp.
Scenedesmus sp.
Oocystis sp.
Other genera
Total
Oscillatoria sp.
Lyngbya sp.
Nitzschia s£.
Oocystis sj^.
Cryptomonas sp.
Other genera
Total
Oscillatoris sp.
Nitzschia SJD.
Diploneis sp.
Tetraedron sp.
Lyngbya sp.
Other genera
Total
Algal Units
per ml
2,
2
140
014
797
545
336
1.972
7,804
3,283
1,082
830
722
721
3.102
9,740
10,277
5,755
1,953
445
445
2,501
21,376
8,779
2,287
2,164
1,266
1,255
3,605
19,356
-------
2. Chlorophyll a -
Sampling
Date
03/04/74
05/15/74
08/06/74
10/28/74
Station
Number
1
2
1
2
1
2
1
2
Chlorophyll a
(yg/D
6.5
6.4
7.6
7.3
17.5
19.4
16.2
20.5
C. Limiting Nutrient Study:
1. Autoclaved, filtered, and nutrient spiked -
Ortho P
Cone, (mg/1)
Inorganic N
Cone, (mg/1)
Maximum yield
(mg/1-dry wt.)
0.029
0.079
0.079
0.029
0.096
0.096
1.096
1.096
4.5
4.4
28.2
8.4
Spike (mg/1)
Control
0.050 P
0.050 P + 1.0
1.0 N
2. Discussion -
The control yield of the assay alga, Selenastrum capri-
cornutum, indicates that the potential primary productivity
of Lake Colorado City was moderately high when the sample was
collected (10/28/74). There was no significant change in yield
with the addition of orthophosphorus, but nitrogen added alone
produced a yield significantly greater than that of the control.
These results indicate that nitrogen was the limiting nutrient.
The lake data support the assay findings. The mean inorganic
nitrogen/orthophosphorus ratio was 4/1 in October and was 7/1 in
March, indicating nitrogen limitation. However, the N/P ratio
in May was 21/1, and phosphorus limitation would be expected.
-------
IV. NUTRIENT LOADINGS
(See Appendix E for data)
For the determination of nutrient loadings, the Texas National
Guard collected monthly near-surface grab samples from each of the
tributary sites indicated on the map (page vi), except for the high
runoff months of April and May when two samples were collected.
Sampling was begun in September, 1974, and was completed in August,
1975.
Through an interagency agreement, stream flow estimates for the
year of sampling and a "normalized" or average year were provided by
the Texas District Office of the U.S. Geological Survey for the
tributary sites nearest the lake.
In this report, nutrient loads for sampled tributaries were
calculated using mean annual concentrations and mean annual flows.
Nutrient loads for unsampled "minor tributaries and immediate
drainage" ("ZZ" of U.S.G.S.) were estimated using the mean concentra-
tions in Morgan Creek at station A-2 and the mean annual ZZ flow.
No known municipal or industrial point sources impacted Lake
Colorado City during the sampling year.
-------
10
A. Waste Sources:
1. Known municipal - None
2. Known industrial - None
B. Annual Total Phosphorus Loading - Average Year:
1. Inputs -
kg P/ % of
Source yr total
a. Tributaries (non-point load) -
Morgan Creek 925 66.5
Unnamed Stream B-l 95 6.8
b. Minor tributaries & immediate
drainage (non-point load) - 140 10.1
c. Known municipal STP's - None
d. Septic tanks* - 115 8.3
e. Known industrial - None
f. Direct precipitatio:o** - 115 8.3
Total 1,390 100.0
2. Outputs -
Lake outlet - Morgan Creek 1,385
3. Net annual P accumulation - 5 kg.
* Estimate based on 400 lakeshore dwellings (Wyatt, 1976); see Working Paper
No. 175.
** See Working Paper No. 175.
-------
11
C. Annual Total Nitrogen Loading - Average Year:
1. Inputs -
kg N/ % of
Source y_r total
a. Tributaries (non-point load) -
Morgan Creek 12,325 47.5
Unnamed Stream B-l 475 1.8
b. Minor tributaries & immediate
drainage (non-point load) - 1,880 7.2
c. Known municipal STP's - None
d. Septic tanks* - 4,265 16.4
e. Known industrial - None
f. Direct precipitation** - 7,040 27.1
Total 25,985 100.0
2. Outputs -
Lake outlet - Morgan Creek 16,620
3. Net annual N accumulation - 9,365 kg.
D. Non-point Nutrient Export by Subdrainage Area:
Tributary kg P/km2/yr kg N/km2/yr
Morgan Creek 1 17
Unnamed Stream B-1 4 18
* Estimate based on 400 lakeshore dwellings (Wyatt, 1976); see Working Paper
No. 175.
** See Working Paper No. 175.
-------
12
E. Yearly Loads:
In the following table, the existing phosphorus loadings
are compared to those proposed by Vollenweider (Vollenweider
and Dillon, 1974). Essentially, his "dangerous" loading is
one at which the receiving water would become eutrophic or
remain eutrophic; his "permissible" loading is that which
would result in the receiving water remaining oligotrophic
or becoming oligotrophic if morphometry permitted. A meso-
trophic loading would be considered one between "dangerous"
and "permissible".
Note that Vollenweider's model may not be applicable to
water bodies with short hydraulic retention times.
Total Phosphorus Total Nitrogen
Total Accumulated Total Accumulated
grams/m2/yr 0.21 < 0.01 4.0 1.4
Vollenweider phosphorus loadings
(g/m2/yr) based on mean depth and mean
hydraulic retention time of Lake Colorado City:
"Dangerous" (eutrophic loading) 0.20
"Permissible" (oligotrophic loading) 0.10
-------
13
V. LITERATURE REVIEWED
Latchford, John B., Jr., 1974. Personal communication (lake morphornetry),
TX Water Qual. Bel., Austin.
Vollenweider, R. A., and P. J. Dillon, 1974. The application of
the phosphorus loading concept to eutrophication research.
Natl. Res. Council of Canada Publ. No. 13690, Canada Centre
for Inland Waters, Burlington, Ontario.
Wyatt, Linda B., 1976. Personal communication (estimate of lakeshore
dwellings). TX Water Qual. Bd., Austin.
-------
VI. APPENDICES
14
APPENDIX A
LAKE RANKINGS
-------
LAKE DATA TO BE USED IN RANKINGS
LAKE
CODE LAKE NAME
4801 AMISTAD LAKE
4802 8ASTROP LAKE
4603 8ELTON RESERVOIR
4804 BRAUNIG LAKE
4805 BROWNWOOD LAKE
4806 LAKE BUCHANAN
4807 CAODO LAKE
4808 CALAVERAS LAKE
4809 CANYON RESERVOIR
4810 LAKE COLORADO CITY
4811 CORPUS CRISTI LAKE
4812 DIVERSION LAKE
4813 EAGLE MOUNTAIN LAKE
4814 FT PHANTOM HILL LAKE
4815 GARZA LITTLE ELM RESERVO
4816 KEMP LAKE
4817 HOUSTON LAKE
4818 LAKE OF THE PINES
4819 LAVON RESERVOIR
4820 LIVINGSTON LAKE
4821 LYNDON B JOHNSON LAKE
4822 MEDINA LAKE
4823 , LAKE MEREDITH
4824 PALESTINE LAKE
4825 POSSUM KINGDOM RESERVOIR
4826 SAN ANGELO RESERVOIR
4827 SAM RAYBURN RESERVOIR
4828 E V SPENCE RESERVOIR
MEDIAN
TOTAL P
0.013
0.02?
0.016
0.134
0.027
0.036
0.055
0.038
0.010
0.042
0.113
0.025
0.024
0.060
0.045
0.023
0.097
0.031
0.063
0.196
0.042
0.010
0.021
0.031
0.023
0.093
0.029
0.036
MEDIAN
INOSG N
0.500
0.090
0.165
0.150
0.100
0.250
0.070
0.060
0.450
0.090
0.130
0.080
0.070
0.105
0.380
O.UO
0.260
0.090
0.180
0.555
0.420
0.600
0.070
0.180
0.070
0.140
0.150
0.080
500-
MEAN SEC
371.474
419.917
378.312
461.625
470.375
437.625
463.333
461.667
384.812
473.625
475.187
470.111
469.625
474.909
475.782
455.000
486.187
440.000
485,333
465.469
456.500
403.562
439.312
442.625
419.045
481.000
439.458
462.583
MEAN
CHLOWA
2.0O
12.392
8.025
22.762
4.887
8.606
14.808
22.500
2.500
12.675
19.756
15.867
5.662
6.317
14.156
10.217
16.650
12.919
5.400
16.112
8.100
12.944
3.037
10.619
9.495
24.675
6.267
11.775
15-
MIN 00
14.900
15.000
15.000
14.800
14.400
15.000
11.400
13.000
14.800
10.200
14.000
9.000
11.000
9.800
14.600
10.400
12.400
15.000
8.800
15.000
14.900
15.000
14.900
14.800
15.000
10.200
15.000
15.000
MEDIAN
DISS OUTHO P
0.009
0.007
0.007
0.062
0.007
0.012
O.OlJ
0.007
0.006
0.012
0.050
0.009
0.008
0.022
0.018
0.007
0.036
0.011
0.018
0.128
0.013
0.004
0.009
0.010
0.009
0.011
0.009
0.008
-------
LAKE DATA TO BE USED IN RANKINGS
LAKE
CODE LAKE NAME
4829 SOMERVILLE LAKE
4830 STAMFORD LAKE
4631 STILLHOUSE HOLLO* RESEKV
4832 TAWAKOM LAKE
4833 TEXARKANA LAKE
4834 TEXOMA LAKE
4835 TRAVIS LAKE
4836 TRINIDAD
4837 TWIN BUTTES RESERVOIR
4838 WHITE RIVER RESERVOIR
4839 WHITNEY LAKE
MEDIAN
TOTAL P
0.053
0.073
O.Olh
0.046
0.106
0.042
0.018
0.389
0.029
0.020
0.028
MEDIAN
1NOHG N
0.115
O.C60
0.160
0.100
0.120
0.160
0.250
0.110
0.250
0.110
0.120
500-
MEAN SEC
473.833
482.714
406.250
466.417
478.500
451.321
389.913
479.500
454.917
434.500
430.500
MEAi.
CHLORA
24.491
18.457
3.917
18.246
19.119
12.493
5.595
24.300
8.708
4.333
6.912
MIN DO
13.000
10.600
15.000
13.200
12.400
15.000
15.000
10.000
14.800
15.000
15.000
MEDIAN
DISS O^TriO
0.013
0.012
0.010
0.013
0.030
0.018
0.007
0.240
0.009
0.009
0.008
-------
PERCENT OF LAKES WITH HIGHER VALUES (NUMBER of- LAKES «ifr? «IGUEK VALUES)
LAKE
CODE LAKE NAME
4801 AMISTAO LAKE
4802 8ASTROD LAKE
4803 8ELTON RESERVOIR
4804 BRAUNIG LAKE
4805 BROrtNWOOD LAKE
4806 LAKE BUCHANAN
4807 CADOO LAKE
4808 CALAVERAS LAKE
4809 CANYON RESERVOIR
4810 LAKE COLORADO CITY
4811 CORPUS CRIST! LAKE
4812 DIVERSION LAKE
4813 EAGLE MOUNTAIN LAKE
4814 FT PHANTOM HILL LAKE
4815 GARZA LITTLE ELM RESERVO
4816 KEMP LAKE
4817 HOUSTON LAKE
4818 LAKE OF THE PINES
4819 LAVON RESERVOIR
4820 LIVINGSTON LAKE
4821 LYNDON 8 JOHNSON LAKE
4822 MEDINA LAKE
4823 LAKE MEREDITH
4824 PALESTINE LAKE
4825 POSSUM KINGDOM RESERVOIR
4826 SAN ANGELO RESERVOIR
4827 SAM RAYBURN RESERVOIR
4828 E V SPENCE RESERVOIR
MEDIAN
TOTAL P
95
79
92
5
66
47
26
45
99
39
8
68
71
24
34
76
16
54
21
3
39
99
82
54
74
13
59
50
( 36)
( 30)
( 35)
( 2)
( 25)
( 18)
( 10)
( 17)
( 37)
( 14)
( 3)
( 26)
( 27)
( 9)
( 13)
( 29)
( 6)
( 20)
( 8)
( 1)
( 14)
( 37)
< 31)
< 20)
( 28)
( 5)
( 22)
t 19)
MEDIAN
INO^G N
5
76
26
42
70
21
91
100
8
76
47
83
91
66
13
61
16
76
29
3
11
0
91
32
91
45
39
83
( 2)
( 28)
( 10)
( 16)
( 26)
( 7)
( 33)
( 38)
( 3)
( 28)
( 18)
( 31)
( 33)
( 25)
( 5)
( 22)
( 6)
( 28)
( ID
( 1)
( 4)
( 0)
( 33)
< 12)
( 33)
( 17)
( 15)
( 31)
500-
MEAN SEC
100
82
97
50
29
74
42
47
95
26
18
32
34
21
16
55
0
66
3
39
53
89
71
63
84
8
68
45
( 38)
( 31)
( 37)
( 19)
( 11)
( 28)
( 16)
( 18)
( 36)
( 10)
( 7)
( 12)
( 13)
( 8)
( 6)
( 21)
( 0)
( 25)
< 1)
( 15)
< 20)
< 34)
< 27)
( 24)
( 32)
( 3)
( 26)
( 17)
MEAN
CHLOriA
100
47
68
8
87
63
32
11
97
42
13
29
79
74
34
55
24
39
84
26
66
37
95
53
53
0
76
50
( 38)
( 18)
( 26)
( 3)
( 33)
( 24)
( 12)
( 4)
( 37)
( 16)
( 5)
( ID
( 30)
( 28)
( 13)
( 21)
( 9)
( 15)
( 32)
( 10)
( 25)
( 14)
( 36)
( 20)
( 22)
( 0)
( 29)
( ISi)
15-
MIN UO
39
17
17
49
58
17
76
67
49
88
61
97
79
95
55
84
72
17
100
17
39
17
39
49
17
88
17
17
( 14)
( 0)
( 0)
t 17)
( 22)
< 0)
( 29)
( 25)
( 17)
( 33)
( 23)
( 37)
( 30)
( 36)
( 21)
( 32)
( 27)
( 0)
( 38)
( 0)
( 14)
( 0)
( 14)
( 17)
( 0)
( 33)
( 0)
( 0)
MEDIAN
oiss OKTHO P
63
92
84
5
84
39
30
92
97
39
a
63
76
16
21
.92
11
46
21
'3
30
100
63
51
63
46
63
76
( 21)
( 34)
( 31)
( 2)
( 31)
( 14)
( 10)
( 34)
( 37)
( 14)
( 3)
( 21)
( 28)
( 6)
( 7)
( 34)
( 4)
( 17)
( 7)
( 1)
( 10)
( 38)
< 21)
( 19)
( 21)
( 17)
( 21)
( 28)
INDEX
NO
40
-------
PERCENT or LAKES WITH HIGHER VALUES (NUMBER OF LAKES *ITH HIGHER VALUES)
LAKE
coot LAKE NAME
4829 SOMERVILLE LAKE
4830 STAMFORD LAKE
4831 STILLHOUSE HOLLOW RESErtV
4832 TAWAKONI LAKE
4833 TEXARKANA LAKE
4834 TEXOMA LAKE
4835 TRAVIS LAKE
4836 TRINIDAD
4837 TWIN BUTTES RESERVOIR
4838 WHITE RIVER RESERVOIR
4839 WHITNEr LAKE
MEDIAN
TOTAL P
29 (
18 (
88 (
32 (
11 <
39 (
88 <
0 (
59 (
84 (
63 <
11)
7)
33)
12)
4)
14)
33)
0)
22)
32)
24)
MEDIAN
INORG N
55
V7
37
70
51
34
21
61
21
61
51
( 21)
'. 37)
( 14)
( 26)
( 19)
( 13)
( 7)
( 22)
( 7)
< 22)
( 19)
500-
MEAN SEC
24
5
87
37
13
61
92
11
58
76
79
( 9)
( 2)
( 33)
( 14)
( 5)
( 23)
( 35)
( 4)
( 22)
( 29)
< 30)
MEAN
CHLO^A
3
18
92
21
16
45
82
5
61
89
71
( 1)
( 7)
( 35)
( 8)
( 6)
( 17)
( 3D
( 2)
( 23)
( 34)
( 27)
15-
MIN oo
67
82
17
63
72
17
17
92
49
17
17
( 25)
( 3D
( 0)
( 24)
< 27)
( 0)
( 0)
( 35)
< 17)
( 0)
( 0)
MEDIAN
DISS 0*THO P
30 I
39 (
51 (
30 (
13 (
21 (
84 (
0 (
63 (
63 (
76 (
10)
14)
19)
10)
5)
7)
31)
0)
21)
21)
28)
INDEX
NO
20rt
259
372
2i3
176
217
J84
169
311
390
357
-------
LAKES RANKED BY INDEX N05,
RANK LAKE CODE LAKE NAME INDEX NO
1 4809 CANYON RESERVOIR 445
2 4823 LAKE MEREDITH 441
3 4813 EAGLE MOUNTAIN LAKE 430
4 4816 KEMP LAKE 423
S 4801 AMISTAO LAKE 402
6 4805 BRO«N«OOD LAKE 394
7 4802 BASTROP LAKE 393
8 4838 WHITE RIVER RESERVOIR 390
9 4825 POSSUM KINGDOM RESERVOIR 387
10 4835 TRAVIS LAKE 384
11 4803 BELTON RESERVOIR 384
12 4831 STILLHOUSE HOLLOW RESERV 372
13 4812 DIVERSION LAKE 372
14 4808 CALAVERAS LAKE 362
15 4839 WHITNEY LAKE 357
16 4822 MEDINA LAKE 342
17 4827 SAM RAYBURN RESERVOIR 322
18 4828 E V SPENCE RESERVOIR 321
19 4837 TWIN 8UTTES RESERVOIR 311
20 4810 LAKE COLORADO CITY 310
21 4824 PALESTINE LAKE 302
22 4818 LAKE OF THE PINES 298
23 4807 CADDO LAKE 297
24 4814 FT PHANTOM HILL LAKE 296
25 4806 LAKE BUCHANAN 261
26 4830 STAMFORD LAKE 259
27 4819 LAVON RESERVOIR 258
28 4832 TArfAKONI LAKE 253
-------
LAKES RANKED BY INDEX NOS.
RANK LAKE CODE LAKE NAME INDEX NO
29 4821 LYNDON B JOHNSON LAKE 238
30 4834 TEXOMA LAKE 217
31 4829 SOMEKVILLE LAKE 208
32 4826 SAN ANGELO RESERVOIR 200
33 4833 TEXAKKANA LAKE 176
34 4815 GARZA LITTLE ELM RESERVO 173
35 4836 TRINIDAD 169
36 4804 BRAUNIG LAKE 159
37 4811 CORPUS CRIST! LAKE 155
38 4817 HOUSTON LAKE 139
39 4820 LIVINGSTON LAKE 91
-------
APPENDIX B
CONVERSION FACTORS
-------
CONVERSION FACTORS
Hectares x 2.471 = acres
Kilometers x 0.6214 = miles
Meters x 3.281 = feet
-4
Cubic meters x 8.107 x 10 = acre/feet
Square kilometers x 0.3861 = square miles
Cubic meters/sec x 35.315 = cubic feet/sec
Centimeters x 0.3937 = inches
Kilograms x 2.205 = pounds
Kilograms/square kilometer x 5.711 = Ibs/square mile
-------
APPENDIX C
TRIBUTARY FLOW DATA
-------
FLO,; ii\FDr
-------
FLO*
03/12/76
LA
-------
APPENDIX D
PHYSICAL and CHEMICAL DATA
-------
SYORET RET*levAL DATE 70/02/11
481001
32 19 19.0 100 55 04.0
LAKE COLORADO CITY
48335 TEXAS
DATE TIME DEPTH
FROM OF
TO DAY FEET
74/03/04 10
10
10
10
74/05/15 12
12
12
12
74/08/06 10
10
10
10
74/10/28 16
16
16
16
20 0000
20 0005
20 0015
20 0027
10 0000
10 0005
10 0015
10 0027
00 0000
00 0005
00 0015
00 0025
00 0000
00 0005
00 0015
00 0027
00010
WATER
TEMP
CENT
20.4
16.9
16.5
14.2
29.2
28.9
28.1
25.9
30.4
30.5
29.8
29.2
23.1
22.9
21.7
21.5
11EFALES
3
00300 '00077 00094
00 TRANSP CNDUCTVY
SECCHI FIELD
MG/L INCHES MICROMMO
8.0
8.0
7.0
7 ft
* • v
60
• v
6.2
5.6
5.8
5.4
4.8
^ • O
7.4
7.0
*t f>
O. V
6.4
42 1630
1545
1474
1396
14 2212
2155
2049
40 2578
2584
2550
2529
26 1517
1478
1475
1453
00400 00410
PH T ALK
CAC03
SU MG/L
8.50
8.50
8.40
8.20
8.30
8.30
8.10
7.80
8.10
8.20
8.20
8.20
8.52
8.50
8.47
8.42
152
161
163
162
142
141
141
148
118
117
118
115
2111202
0031 FEET DEPTH
00610 00625 00630 00671
NH3-N TOT KJEL N02&N03 PHOS-DIS
TOTAL N N-TOTAL ORTHO
MG/L MG/L MG/L MG/L P
0.040
0.030
0.030
0.090
0.040
0.060
0.070
0.160
0.040
0.030
0.030
0.030
0.900
0.600
0.600
0.800
1.000
0.800
0.700
0.800
0.700
0.800
0.700
0.700
0.040
0.020
0.070
0.040
0.030
0.080
o.oao
0.190
0.020
0.020
0.020
0.030
0.016
0.010
0.013
0.013
0.006
0.006
0.007
0.009
0.017
0.015
0.014
0.012
DATE
FROM
TO
74/03/04
74/05/15
74/08/06
74/10/28
TIME DEPTH
OF
DAY FEET
10 20 0000
10 20 0005
10 20 0015
10 20 0027
12 10 0000
12 10 0005
12 10 0015
12 10 0027
10 00 0000
10 00 0009
16 00 0000
16 00 OOOS
16 00 0015
16 00 0027
00665
PHOS-TOT
MG/L P
0.022
0.021
0.022
0.025
0.039
0.036
0.035
0.052
0.046
0.042
0.044
0.042
32217
CHLRPHYL
A
UG/L
6.5
7.6
17.5
16.2
00031
INCDT LT
REMN1NG
PERCENT
In
.0
Ifi
.0
-------
STOnET RETRIEVAL DATE 76/02/11
4310U2
32 20 J8.0 100 55 51.0
LAKE COLORED CITY
4633S TEXAS
DATE
FROM
TO
74/03/04
74/05/15
74/08/06
74/10/28
DATE
FROM
TO
74/03/04
74/05/15
74/08/06
74/10/28
TIME DEPTH
OF
DA* FEET
11 15 0000
11 15 0005
11 15 0016
11 55 0000
11 55 0005
11 55 0012
10 20 0000
10 20 0005
10 20 0012
IS 35 0000
15 35 0005
15 35 0016
TIME DEPTH
OF
DAY FEET
11 15 0000
11 15 0005
11 15 0016
11 55 0000
11 55 0005
11 55 0012
10 20 0000
15 35 0000
15 35 0005
15 35 0016
00010
WATER
TEMP
CENT
21.5
18.6
16.5
27.5
27.5
27.3
28.8
26.8
27. d
21.0
21.0
21.0
00665
PHOS-TOT
MG/L P
0.025
0.023
0.040
0.055
0.04£
0.0 SO
0.07^.
O.OTi
O.Ob?
00300
00
MG/L
7.8
6.8
6.6
6.2
6.2
6.0
6.0
6.8
6.8
6.8
32217
CHLRPHYL
A
UG/L
6.4
7.3
19.4
20.5
00077
TRANSP
SECChI
INCHES
30
14
24
21
00031
INCDT LT
REMNlNG
PERCENT
00094
CUDUCTVY
FIELD
MICSOMHO
1640
1605
1514
2145
2143
2126
2546
2545
2490
1169
1168
1210
llEPAuES
3
00400 00410
PH T ALK
SU
8.40
8.40
8.3C
8.30
8.30
8.20
6.40
8.40
8.90
8.39
8.38
b.37
CAC03
MG/L
163
164
164
138
139
146
111
109
110
2111202
0020 FEET DEPTH
00610 00625 00630
NH3-N TOT KJEL N02fcN03
TOTAL
MG/L
0.030
0.030
0.070
0.070
0.060
0.070
0.030
0.030
0.040
N
MG/L
0.700
0.700
0.700
1.300
0.800
0.800
0.700
0.600
0.600
N-TOTAL
MG/L
0.030
0.030
0.050
0.090
0.080
0.100
0.060
0.060
0.060
00671
PHOS-UIS
OtfTHO
MG/L P
0.009
0.011
0.019
0.009
0.008
0.009
0.026
0.022
0.023
-------
APPENDIX E
TRIBUTARY DATA
-------
STORE! RETRIEVAL DATE 76/03/1W
DATE TIME DEPTH N02&N03
FROM OF
TO DAY FEET
74/09/08
74/10/08
74/11/08
74/12/10
75/01/09
75/02/10
75/03/10
75/04/03
75/04/18
75/05/07
75/05/27
75/06/20
75/07/18
75/08/19
17 05
13 40
13 45
13 00
14 ?5
11 00
11 00
09 30
12 30
14 45
14 25
11 30
11 45
15 10
4810A1
32 18 55.0 100 55 05.0 4
MORGAN WEEK
48091 7.5 L« COLO CITY
0/l_ArvE COLORADO CITY
TX HrfY Ib3 .2 fl DOWNSTREAM FROM DAM
11EPALES 2111204
0000 FEET DEPTh CLASS 00
0630
C.N03
OTAL
G/L
0.040
0.056
0.049
0.104
0.112
0.160
0.020
0.020
0.035
O.OlU
0.005
0.005
0.015
0.010
00625
TOT KJEL
N
MG/L
3.300
1.800
1.400
1.000
1.000
1.200
1.050
0.650
1.800
1.700
1.950
2.200
2.300
1.000
00610
NH3-N
TOTAL
MG/L
0.055
0.035
0.070
0.096
0.152
0.216
0.015
0.025
0.040
0.035
0.020
0.035
0.035
0.025
00671
PriOS-OIS
ORTHO
MG/L P
0.040
0.035
0.010
0.008
0.005K
0.016
0.015
0.010
0.025
0.030
0.045
0.060
0.030
0.025
00665
PHOS-TOT
MG/L P
0.430
0.150
0.060
0.040
0.040
0.030
0.070
0.080
0.140
0.110
0.200
0.240
0.210
0.120
K VALUE KNOWN TO BE
LESS THAN INDICATED
-------
STORE! RETRIEVAL DATE 7t,/03/10
DATE TIME DEPTH
FROM OF
TO DAY FEET
74/10/08
74/11/08
74/12/10
75/01/09
75/02/10
75/03/10
75/04/03
75/04/18
75/05/07
75/05/27
75/06/20
75/07/18
75/08/19
13
14
13
14
11
11
09
12
15
14
11
17
15
55
15
15
45
25
15
45
45
00
45
45
00
30
4810A2
32 23 00.0 100 58 45.0 4
MORGAN CHEt*
43 7.5 CEOAR dENu
T/LA*E COLORADO CITY
UNIMPKOVED «0 XING 4 MI NE OF
11EPALES 2111204
0000 FEET DEPTH CLASS 00
0630
^N03
OTAL
IG/L
0.296
0.168
o.ooa
0.168
0.008
0.040
0.010
0.420
0.440
0.280
0.045
0.130
0.02S
00625
TOT KJEL
N
MG/L
1.200
1.400
0.900
1.200
1.100
1.250
1.000
i.eoo
1.700
1.150
1.100
1.100
1.080
00610
NH3-N
TOTAL
MG/L
0.035
0.025
0.032
0.024
0.032
0.010
0.035
0.050
0.035
0.070
0.035
0.055
0.025
00671
PHOS-OIS
ORTHO
MG/L P
0.015
0.040
0.024
0.005K
0.024
0.015
0.010
0.015
0.015
0.025
0.020
0.015
0.120
00665
DHOS-TOT
MG/L P
0.100
0.120
0.080
0.070
0.050
0.080
0.050
0.060
0.060
0.160
0.110
0.130
0.285
K VALUE KNOWN TO BE
LESS THAN INDICATED
-------
STORE! rtETfiiEVAL DATE 7fc/0i/10
DATE TIME DEPTH N02&N03
FROM OF
TO DAY FEET
74/11/08 13 30
75/05/27 14 10
75/08/19 15 00
4810B1
32 21 50.0 100 58 20.0 4
UNNAMED STficAM .
48 7.5 LK COLO CITY
T/LAKE COLORADO CITY
SEC rtO BRDG 2.5 MI E OF KEST8ROOK
11EPALES 2111204
0000 FEET DEPTH CLASS 00
0630
C.N03
OT.AL
iG/L
0.056
0.010
0.090
00625
TOT KJEL
N
MG/L
1.500
1.600
0.850
00610
NH3-N
TOTAL
MG/L
0,065
0.025
0.025
00671
PHOS-01S
ORTHO
MG/L P
0.140
0.070
0.170
00665
PHOS-TOT
MG/L P
0.230
0.250
0.340
------- |