U.S. ENVIRONMENTAL PROTECTION AGENCY
           NATIONAL EUTROPHICATION SURVEY
                    WORKING PAPER SERIES
                                         REPORT
                                          ON
                                       CADDO LAKE
                                   CADDO PARISH, LOUISIANA
                              MARION AND HARRISON COUNTIES, TEXAS
                                      EPA REGION VI
                                 .
                                   WORKING PAPER No, 637

 CORVALLIS ENVIRONMENTAL RESEARCH LABORATORY - CORVALLIS, OREGON
                             and
ENVIRONMENTAL MONITORING & SUPPORT LABORATORY - LAS VEGAS, NEVADA
 699-440

-------
                                  REPORT
                                    ON
                                CADDOLAKE
                          CADDO PARISH, LOUISIANA
                    MARION AND HARRISON COUNTIES, TEXAS
                               EPA REGION VI
                           WORKING PAPER No, 637
        WlTH THE COOPERATION OF THE
LOUISIANA WILD LIFE AND FISHERIES COMMISSION
                  AND THE
         LOUISIANA NATIONAL GUARD
                MARCH, 1977

-------
            REPORT ON CADDO LAKE

           CADDO PARISH,  LOUISIANA

     MARION AND HARRISON  COUNTIES, TEXAS

                EPA REGION VI


                     by

       National Eutrophication Survey

      Water and Land Quality Branch
       Monitoring Operations Division
Environmental  Monitoring  & Support Laboratory
              Las Vegas,  Nevada

                     and

           Special Studies Branch
 Corvallis Environmental  Research Laboratory
              Corvallis,  Oregon
            Working Paper No. 637
     OFFICE OF RESEARCH AND DEVELOPMENT
    U.S. ENVIRONMENTAL PROTECTION AGENCY

                 March 1977

-------
                          CONTENTS







                                                       Page



Foreword                                                i i



List of Louisiana Study Lakes                           iv



Lake Drainage Area Map                                   v



Sections



  I.  Conclusions                                        1



 II.  Lake and Drainage Basin Characteristics            4



III.  Lake Water Quality Summary                         6



 IV.  Nutrient Loadings                                 14



  V.  Literature Reviewed                               20



 VI.  Appendices                                        21

-------
                               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,  concen-
trations, 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 nonpoint source pollution abatement in lake water-
sheds.

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
watershed data collected from the  study lake and Its drainage
basin is documented.  The report is formatted to provide  state
environmental agencies with specific information for basin
planning [§303(e)], water qualitv criteria/standards review
[§303(c)L clean lakes [§314(a,bj], and water quality  monitoring
[§106 and §305(b)] activities mandated by the Federal  Water
Pollution Control Act Amendments of 1972.

-------
                                  111
     Beyond the single lake analysis, broader based correlations
between nutrient concentrations (and loading) and trophic condition
are being made to advance the rationale and data base for refine-
ment of nutrient water quality criteria for the Nation's freshwater
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 the U.S. Environmental Protection
Agency and to augment plans implementation by the states.

ACKNOWLEDGMENTS

     The staff of the National Eutrophication Survey (Office of
Research and Development, U.S. Environmental Protection Agency)
expresses sincere appreciation to the Louisiana Wild Life and
Fisheries Commission, Division of Water Pollution Control and
to the Texas Water Quality Board for professional involvement,
to the Louisiana and Texas National Guards for conducting the
tributary sampling phase of the Survey, and to those Louisiana
and Texas wastewater treatment plant operators who provided
effluent samples and flow data.

     Robert A. Lafleur, Chief; J. Dale Givens, Assistant Chief;
Lewis R. Still, Biologist; Louis Johnson, Biologist; Lee Cau-
barreaux, Biologist; Darrell Reed, Engineer; Dempsey Alford,
Biologist; and Elwood Goodwin, Water Quality Control Technician,
all of the Louisiana Wild Life and Fisheries Commission, Division
of Water Pollution Control; and Hugh C. Yantis, Jr., Executive
Director of the Texas Water Quality Board; John B. Latchford, Jr.,
Director; and the staff of the Texas Water Quality Board Field
Operations Division reviewed the peril mi nary reports and provided
critiques most useful in the preparation of this Working Paper
Series.

     Major General O'Neil Daigle, Jr., the Adjutant General  of
Louisiana, and Project Officer Colonel Lawrence P. Dupre, who
directed the volunteer efforts of the Louisiana National Guardsmen;
and Major General Thomas Bishop, the Adjutant General of Texas, and
Project Officer William L. Seals, who directed the volunteer efforts
of the Texas National Guardsmen are also gratefully acknowledged  for
their assistance to the Survey.

-------
                                  IV
                    NATIONAL EUTROPHICATION SURVEY
                              STUDY LAKES
                          STATE OF LOUISIANA
LAKE NAME
Anacoco Lake
Lake Bistineau
Black Bayou
Black Lake
Bruin Lake
Bundick Lake
Caddo Lake

Cocodrie Lake
Cocodrie Lake (Lower)
Concordia Lake
Cotile Lake
Cross Lake
D'Arbonne Lake
False River Lake
Indian Creek Reservoir
Saline Lake
Turkey Creek Lake
Lake Vernon
Lake Verret
  PARISH
Vernon
Bienville, Webster
Caddo
Natchitoches and Red River
Tensas
Beauregard
Caddo (Menon and Harrison
  in Texas)
Concordia
Rapides
Concordia
Rapides
Caddo
Union
Pointe Coupee
Rapides
LaSalle
Franklin
Vernon
Assumption

-------
 CADDO     LAKE
g   -*•:.-'.'..  'a-:'.": 3::e
X   -2
-------
                   REPORT ON CADDO LAKE,  LOUISIANA
                          STORE! NO.  4807

I.    CONCLUSIONS
     A.    Trophic Condition:*
               Survey data indicate that  Caddo Lake is  eutrophic,  i.e.,
          nutrient rich and highly productive.   Whether such  nutrient
          enrichment is to be considered  beneficial  or  deleterious is
          determined by its actual  or potential  impact  upon designated
          beneficial  water uses  of each lake.
               Secchi disc visibility in  this  humic lake was  poor  and
          potential  for primary  production,  as  measured by algal assay
          control yield,  was moderate to  high.   Chlorophyll a_ levels
          ranged from 2.4 yg/1 to 95.0 ug/1, with a mean of 21.3 yg/1.
          Of the 19 Louisiana lakes sampled  in 1974, 12 had higher
          total  phosphorus  levels,  17 had higher inorganic nitrogen,
          and  14 had  higher orthophosphorus  values  than Caddo  Lake.
               Survey limnologists reported  emergent vegetation along
          80%  of the shoreline and an oily surface  scum on the lake during
          all  sampling occasions.
     B.    Rate-Limiting Nutrient:
               Algal  assay results for the spring sampling season
          suggested near  col imitation in  Caddo  Lake by  phosphorus  and
          nitrogen.   In the autumn assay, growth increases accompanied

    *See  Appendix  E.

-------
     the addition of phosphorus to the Stations 01  to 03 sample,
     but in the Stations 04 to 06 sample, growth response was
     achieved with the addition of nitrogen.   Mean  inorganic nitro-
     gen to orthophosphorus (N/P) ratios in the lake were 7/1 and
     less than 6/1, respectively, during March and  November, sug-
     gesting nitrogen limitation and 14/1 during May, suggesting
     near-col imitation by the two.
C.   Nutrient Controllability:
     1.    Point sources -
               During the sampling year, the mean annual phosphorus
          load from point sources was estimated to  be approximately
          3.5% of the total load reaching Caddo Lake.  The city of
          Jefferson contributed 3.0% of that load.
                                                   2
               The phosphorus loading of 0.73 g P/m /yr for Caddo
          Lake is less than the "eutrophic" load proposed by Vollen-
          weider (1975) for lakes with such volume  and detention
          time.  However, loading calculations yield an apparent  net
          export of phosphorus and nitrogen from the lake.  This  could
          be due to an underestimation of nutrient  loadings from the
          six ungaged tributaries entering Caddo Lake (see Section
          IV-E) or to the lack of nutrient load estimations for the
          Longhorn Ordnance Plant or other undetected and unmeasured
          point sources.  Any addition to the existing phosphorus loading
          of this lake should be carefully evaluated until a complete
          nutrient budget for the lake can be determined.

-------
2.    Nonpoint sources -
          The phosphorus load from nonpoint sources was  96.5% of
     the total  reaching the lake during the sampling year.   Cypress
     Bayou contributed 74.7%, Monterey Lake Outlet contributed 10.5%,
     and the ungaged tributaries and immediate drainage  were esti-
     mated to have contributed 5.0% of the nonpoint source  phosphorus
     load.
          In general, few lakes are nitrogen limited as  a result of
     low nitrogen.  Rather, excessive phosphorus  levels  shift limi-
     tations to nitrogen or other factors.  Regardless of the primary
     nutrient limitation suggested by either algal  assay or nutrient
     ratios, the most feasible approach to nutrient control, if desir-
     able, is through available phosphorus control  technology and
     subsequent establishment of phosphorus limitation within the
     water body.

-------
II.   LAKE AND DRAINAGE BASIN CHARACTERISTICS

          Lake and drainage basin characteristics are itemized below.

     Lake surface area and mean depth was provided by the State of

     Louisiana, maximum depth was estimated on the basis of Survey data;

     tributary flow data were provided by the Louisiana and Texas  District

     Offices of the U.S. Geological Survey (USGS).  Outlet drainage area

     includes the lake surface area.  Mean hydraulic retention time was

     obtained by dividing the lake volume by mean flow of the outlet.

     Precipitation values are estimated by methods as outlined in  National

     Eutrophication Survey (NES) Working Paper No. 175.  A table of metric/

     English conversions is included as Appendix A.

     A.   Lake Morphometry:

          1.   Surface area:  132.09 km2.
          2.   Mean depth:  1.8 meters.
          3.   Maximum depth:  3.0 meters.
          4.   Volume:  231.896 x 106 m3.
          5.   Mean hydraulic retention time:  42 days.

-------
B.   Tributary and Outlet:
     (See Appendix B for flow data)

     1.   Tributaries -

                                             Drainage       Mean flow
          Name                               area(km2)      (m3/sec)

          C-l Harrison Bayou                   112.9          0.93
          D-l Kitchen Creek                     88.8          0.73
          J-l Cypress Bayou                  5,542.6         46.05
          L-l Monterey Lake Outlet             909.1          7.48

          Minor tributaries and
          immediate drainage -                 321.1          3.73

                    Totals                   6,974.5         58.92

     2.   Outlet - A-l Willow Pass Creek     7,107.0         64.20
                       (Twelvemile Bayou)

C.   Precipitation:

     1.   Year of sampling:  156.1 cm.
     2.   Mean annual:  113.7 cm.

-------
III.  LAKE WATER QUALITY SUMMARY
          Caddo Lake was sampled four times during  the  open-water
     season of 1974 by means of a pontoon-equipped  Huey helicopter.
     Each time, samples for physical  and chemical parameters were
     collected from six stations on the lake and from one  or more
     depths at each station (see map, page v)..   During  each visit,
     depth-integrated samples were collected from each  station  for
     chlorophyll a_ analysis and phytoplankton identification and
     enumeration.  During the first and last visits,  18.9-liter
     depth-integrated samples were composited for algal  assays.
     Maximum depths sampled were 1.5 meters at Stations 01, 04, 05,
     and 06, and 1.8 meters at Stations 02 and 03.   For a  more  de-
     tailed explanation of NES methods, see NES Working Paper No. 175.
          The results obtained are presented in full  in Appendix C
     and are summarized in III-A for waters at the  surface and  at the
     maximum depth for each site.  Results of the phytoplankton counts
     and chlorophyll a_ determinations are included  in III-B.  Results
     of the limiting nutrient study are presented in  III-C.

-------
CAOOO LAKE
STO^ET CODE 4n07
PHYSICAL AND CHEMICAL CHARACTERISTICS

                 (  5/J1/74  )
                                                                                                           (   8/26/74 )
PARAMETER N*
TEMPERATURE IUEG CENTJ
O.-l.S M DEPTn 11
MAX DEPTH00 6
DISSOLVED 0*YGEN (*G<
0.-1.5 M OEKTH
MAX DEPTH**
CONDUCTIVITY (UMHOS)
O.-l.S M DEPTH
MAX DEPTH**
PH (STANDAPO UNITS)
O.-l.S M DEPTH
MAX DEPTH**
TOTAL ALKALINITY (MQ.
O.-l.S M OEPTH
MAX DEPTH**
TOTAL P (MG/L)
O.-l.S M PFPTH
MAX 0 F P T H * *
'L>
5
6

11
6

11
6
/L)
11
6

11
t
DISSOLVED ORTHO P (MG/L)
0_]ClMnFPTH I*
.l.i ^° i ' c. " l n
MAX OEPTH**
NO?*N03 (MG/L)
01 C jui HFi-JTr^
.— !.:> "^ ICrln
MAX OEPTH**
AMMONIA (MG/L)
O.-l.S M PEr'TH
MAY i'^C"DTw<>4>
M fl A '.Itrlrl
KJtL'~'AHL N (MG/L)
01 C M f^fiJTrt
• l.T f" U C. K I n
MAX DEPTH**
1 A
6
11
l

11
1 1
1 1
6
Sooo
PANGE
15. H- 17. S
15.8- 17.4

7.4-
7.2-

91.-
92.-

6.2-
6.2-

10.-
10.-

0.035-0
On 4 H — n
• u o n — \i
On n 7 — n
* U U f — U
0.007-0

Of\ Q f\ f\
• U c U — U
0.020-0
Of. n (i r\
• O U U — U
0.600-0

9.4
9.4

169.
169.

7.4
6.9

21.
19.

.055
no A
. Ux. u
.020
A O A
• U O U
ii b A
* UnO
.060
7 n ft
. f UO
.700
MEDIAN
16.0
16. b

3.8
8.7

106.
107.

6.8
6.7

14.
16.

0.042
On A n
. '1 »+ u
n oil)
U . " 1 U
0.011
On "^ n
» n j u
OA A A
. 'J ** U
0.040
On A u
. \i *t U
OA A n
• o u u
o.6no
(METERS)
0.0- 1.5
1.5- l.H

1.5-
1.5-

0.0-
1.5-

0.0-
1.5-

0.0-
l.h-

0.0-

1.5-
On —
. u
1C
• b —
0.0-
1 c_
I » O""
OA —
• U
1.5-

1.5
1.3

1.5
1.8

1.5
1.8

1.5
1.8

1.5
1 • 0
1 C
I . 3
1.8
1C
. -3
1(i
* O
1.5
1 A
1 . o
1C.
• ^J
1.8
6

6
6

12
6

12
6

12
6

12
i y
i C
6

12
ti

1 3
1 C
6
2a.9-

6.8-
6.8-

139.-
139.-

7.2-
7.3-

10.-
10.-

0.046-0
On c n _ n
. U j \j — \J
On n f\ — f i
• u u o — u
0. 006-0
On ? n — n
. U c 11 — U
0 * 020 — 0
0.030-0
Of i -5 n (\
• U j U — U
Oil ^ i-. n
* b u u u
0.500-0
27.9
27.9

7.6
7.6

222.
222.

8.4
7.9

17.
17.

.060
A (* A
. U D U
A 2 A
• U c U
.012
1 A (I
. 1 *f U
i /. n
• 1 ^ U
.060
n t n
• U D U
.700
MEDIAN
26.9
26. b

7. 1
7.1

187.
186.

7.7
7.5

11.
11.

0.051
On c •,
• U D1*
On A 7
• u u f
0.007
A n "3 n
If * U J U
o . o r-j 5
0.0^0
On A n
. u*^ u
0'7 ft n
. f U U
0.6HO
MAX
DEPTw
RANGE
(METEKS)
0.0- 1.5
0.6- 1.5

0.6-
0.6-

0.0-
0.6-

0.0-
0.6-

0.0-
0.6-

0.0-
Of
. b —
On ••
. u —
0.6-
On
• U —
0 .6-
0.0-
0^
. 6 —
Ori
. 0 —
0.6-

1.5
1.5

1.5
1.5

1.5
1.5

1.5
1.5

1.5
It
. b
1C
. b
1.5
1C,
• b
1.5
1.5
It
. b
It
. b
1.5
NO
10

-------
                                   ( 11/11/7"
                                                                  AND CHEMICAL  CrtAtfACTtrdSTICb
TEVi-'E-i't [IJ-TI .(otC- <_i.N.T)
0.-l.c •" Ct>Tn 12
MAX OFPTi-«° 6
DISSOLVED OXYGEN I^G/LI
O.-l .5 M DEPTH lie
WAX OfPTn*0 b
CONDUCTIVITY (Ll'-inv)i)
O.-l.T M DEPTH 12
MA* DEPTH*0 f>
PH (STANDARD UNITS)
O.-l.b M DEPTH 12
MAX DEPTH*"" 6
TOTAL ALKALINITY (i'G/L)
O.-l. 5 M '...EPTH 12
MAX. DEPTH-* 6
TOTAL P (MG/L)
O.-l.'i v OE^r-i 12
MAX DEPTH** ti
DISSOLVED ORTHO P 
0,-l.S 14 DEPTH if
MAX OEPTH»» b
KJtLl-AnL <"• (M'i/L)
0 . - I . c, N ! i E H- T n 12
MAX np-pTH«-«- 6

16.2-
16.3-

4.d-
4.8-

54.-
58.-

5.3-
5.3-

lil.-
10.-

0.0<»3-0
0.047-0

0.006-0
0.009-0
0.020-0
0.020-0

0.030-0
0.030-0

0.500-0
0.500-0

17.2
17.2

a. 4
6.4

109.
109.

6.4
6.3

16.
16.

.079
.079

.0?0
.019
.030
.030

.330
.330

.900
.900

16.0
16.7

7.3
7.3

94.
84.

S.b
5.5

11.
11.

0.061
0.0 6b

0.01^
O.ni 7
0.020
0.020

0.04b
0.04b

0.601/
0 . ^>0 "

0
1

0
1

0
1

0
1

n
l

0
1

0
1
0
1

ft
1

0
1

.0-
. 5-

.0-
.5-

.0-
.5-

.0-
.5-

.0-
.5-

.0-
.5-

.0-
.b-
.0-
. 5-

.0-
.5-

.0- .
.5-

1
1

1
1

1
1

1
1

1
1

1
1

1
1
1
1

1
1

1
1

» ^
•^

.5
.5

.b
. 5

.S
.b

.S
.b

.b'
.5

.S
.b
.b
.S

.b
.5

.b
.5
SECCHI DISC  (.
                             0.9-   1.3     1.1
                          *  N  =  NO. OP S
                          *«• MAXIMUM UEPTH SAMKLKU  AT tACh SITE
                          • «»»  i  =  MO. Or SlltS  SuMkLtO ON IH!«; DATE

-------
B.   Biological  Characteristics:

     1.    Phytoplankton -

          Sampling
          Date

          03/23/74
          05/31/74
          06/03/74
Dominant
Genera
1.
2.
3.
4.
5.
Melosira
Chlamydomonas
Flagellates
Raphidiopsis
Nitzschia

Other genera

      Total
                                       Other genera

                                             Total
Algal
Units
per ml

 4,960
 1,114
   861
   709
   607

 3.493

11,744
1.
2.
3.
4.
5.
Lyngbya
Melosira
Dactylococcopsis
Nitzschia
Microcystis
15,979
2,527
1,957
1,957
1,141
                          7.255

                         30,816
1.
2.
3.
4.
5.
Lyngbya
Melosira
Pennate diatom
Microcystis
Merismopedia
Other genera
18,932
5,177
1,923
1,331
1,035
7,543
                                             Total
                         35,941

-------
                             10
2.   Chlorophyll a^ -

     Sampling                 Station                Chlorophyll
     Date                     Number                 (yg/1 )
     03/23/74                   01                       4.9
                                02                       8.7
                                03                       5.4
                                04                      10.1
                                05                      10.9
                                06                      11.0

     05/31/74                   01                      28.1
                                02                      28.1
                                03                      28.1
                                04                      95.0
                                05                      16.9
                                06                      25.3

     08/26/74                   01                      15.8
                                02                      20.5
                                03                      11.3
                                04                      25.0
                                05                      27.6
                                06                      22.4

     11/11/74                   01                       2.4
                                02                       2.5
                                03                       7.1
                                04                      11.9
                                05                       6.0
                                06                       8.0

-------
                                 11
C.   Limiting Nutrient Study:

     1.   Autoclaved, filtered, and nutrient spiked -

          a.   03/23/74 - Stations 01-05
                              Inorganic N
                              Cone.(mg/1)

                                0.069
                                0.069
                                1.069
                                1.069
          b.   11/11/74 - Stations 01-03
Ortho P
Spike (mg/1) Cone. (mg/1)
Control
0.05 P
0.05 P + 1.0 N
1.00 N
0.017
0.067
0.067
0.017
                         Ortho P        Inorganic N
                         Cone.(mg/1)     Cone!(mg/1)
Spike(mg/1)           	

Control          0.010
0.05 P           0.060
0.05 P + 1.0 N   0.060
1.00 N           0.010

c.   11/11/74 - Stations 04-06
                                            M*
                                            M
                                            M
                                            M
Spike(mg/l)

Control
0.05 P
0.05 P + 1.0 N
1.00 N
               Ortho P
               Cone.(mg/1)

                 0.016
                 0.066
                 0.066
                 0.016
Inorganic N
Cone.(mg/1)

  0.087
  0.087
  1.087
  1.087
                                                       Maximum Yield
                                                       (mg/l-dry wt.)

                                                            1.0
                                                            1.8
                                                           16.6
                                                            1.4
                                             Maximum Yield
                                             (mg/1-dry wt.)

                                                  0.6
                                                  2.3
                                                 14.2
                                                  0.5
                                                       Maximum Yield
                                                       (mg/1-dry wt.)

                                                            2.2
                                                            2.4
                                                           17.0
                                                            3.6
     ''Missing.

-------
                          12
2.    Discussion -
          The control yields of the assay alga,  Selenastrum
     capricornutum, indicate that the potentials for primary
     production were moderate to high in Caddo Lake at the times
     of sampling.  In the spring assay, spikes with either phos-
     phorus or nitrogen alone produced slight increases in assay
     yield, suggesting near colimitation by the two nutrients.
     Maximum yield was achieved with the simultaneous addition
     of both nutrients.
          In the autumn assay, the control yield of the assay for
     Stations 01 to 03 was much lower than that for Stations 04
     to 06.  This is possibly attributable to the proximity of
     Stations 04 to 06 to the Mooringsport sewage treatment plant
     outfall.  The assay for Stations 01 to 03 showed a growth
     response to the addition of phosphorus, suggesting phosphorus
     limitation, while the Stations 04 to 06 assay showed response
     to the addition of nitrogen.  Again, simultaneous additions
     of both phosphorus and nitrogen resulted in maximum assay
     yields.
          The mean N/P ratios in the lake data were 7/1 and less
     than 6/1 for March and November suggesting nitrogen limita-
     tion.  The N/P ratio of 14/1 during May sampling suggests
     borderline phosphorus limitation (an N/P ratio of 14/1 or
     greater generally reflects phosphorus limitation).

-------
                        13
     It should be noted that significant chemical  changes
took place in Louisiana lake samples between collection and
assay analysis.  The assay data should be considered in this
context and until such differences are resolved, used with
caution for any prediction of actual lake conditions.  Such
chemical changes are likely to alter the control yield as
well as modifying the N/P ratio.

-------
                                     14
IV.   NUTRIENT LOADINGS
     (See Appendix D for data)

          For the determination of nutrient loadings,  the  Louisiana

     and Texas National Guards collected monthly near-surface  grab

     samples from each of the tributary sites indicated  on the map

     (page v), except for the high runoff month  of  February when

     two samples were collected.  Sampling was begun in  June  1974,

     and was completed in April 1975.

          Through an interagency agreement, stream  flow  estimates

     for the year of sampling and a "normalized" or average year were

     provided by the Louisiana and Texas District Offices  of  the USGS

     for the tributary sites nearest the lake.

          In this report, nutrient loads for sampled tributaries were

     determined by using a modification of a USGS computer program  for

     calculating stream loadings.  Nutrient loads indicated for tribu-

     taries are those measured minus known point source  loads, if any.

          Nutrient loadings for unsampled "minor tributaries  and  imme-

     diate drainage" ("ZZ" of USGS) were estimated  by  using the mean

     annual nutrient loads, in kg/km^/yr, in Harrison  Bayou,  Kitchen

     Creek, and Monterey Lake outlet at Stations C-l,  D-l, and L-l,

     and multiplying the means by the ZZ area in km^.

          The operators of the Jefferson and Mooringsport  wastewater

     treatment plants provided monthly effluent  samples  and corres-

     ponding flow data.

-------
                                                15
A.   Waste Sources:

     1.   Known municipal -


     Name

     Jefferson

     Mooringsport
Population               Mean Flow     Receiving
Served*      Treatment*  (m3/d x IP3)  Water
 2,866

   850
     2.   Known industrial -


     Name                   Product
     Longhorn
     Ordnance Plant
Ammunition
Stabilization  2.116
pond
Trickling
filter
Treatment

Trickling
fi1ter
  0.246
Black Cypress
Bayou
Caddo Lake
                         Mean Flow     Receiving
                         (m3/d x IP3)  Hater
Unknown
Caddo Lake
     *Sewage treatment plant questionnaires.

-------
                                 16
Annual Total Phosphorus Loading - Average Year:

1.    Inputs  -
                                                       % of
      Source                             kg P/yr        total

      a.    Tributaries  (nonpoint load) -

           C-l  Harrison Bayou             2,655          2.7
           D-l  Kitchen Creek                860          0.9
           J-l  Cypress Bayou             72,560         74.7
           L-l  Monterey Lake Outlet      10,200         10.5

      b.    Minor  tributaries and immediate
           drainage  (nonpoint  load) -     4,815          5.0

      c.    Known  municipal  STP's -

           Jefferson                      2,930          3.0
           Mooringsport                     485          0.5

      d.    Septic tanks* -                  260          0.3

      e.    Known  industrial -

           Longhorn Ordnance Plant      Unknown          —

      f.    Direct precipitation** -       2.310          2.4

                     Totals             97,075        100.0

2.    Output  -

           A-l  Willow Pass  Creek        103,390
               (Twelvemile  Bayou)

3.    Net  annual  P export*** -            6,315
  *Estimate based on 58 lakeside residences, 1  state park,  and 130 camps.
 **Estimated (see NES Working Paper No.  175).
***Export probably due to unknown sources and/or sampling error.

-------
                                   17
C.   Annual Total Nitrogen Loading - Average Year:

     1.   Inputs -
                                                            % of
          Source                             kg N/yr        total

          a.   Tributaries (nonpoint load) -

               C-l Harrison Bayou             21,710         1.5
               D-l Kitchen Creek              14,310         1.0
               J-l Cypress Bayou           1,052,130        72.6
               L-l Monterey Lake Outlet      147,470        10.2

          b.   Minor tributaries and immediate
               drainage (nonpoint load) -     55,230         3.8

          c.   Known municipal STP's -

               Jefferson                       4,880         0.3
               Mooringsport                    1,500         0.1

          d.   Septic tanks* -                 9,795         0.7

          e.   Known industrial -

               Longhorn Ordnance Plant       Unknown         —

          f.   Direct precipitation** -      142,605         9.8

                         Totals            1,449,630       100.0

     2.   Outputs -

               A-l Willow Pass Creek       1,775,590
                   (Twelvemile Bayou)

     3.   Net annual  N export*** -           325,960
       *Estimate based on 58 lakeside residences,  1  state park,  and
        130 camps.
      **Estimated (see NES Working Paper No.  175).
     ***Export probably due to unknown sources and/or sampling error.

-------
                                      18
D.   Mean Annual Nonpoint Nutrient Export by Subdrainage Area:

     Tributary                          kg P/km2/yr    kg N/km^/yr
     Harrison Bayou
     Kitchen Creek
     Cypress Bayou
     Monterey Lake Outlet
    24
    10
    13
    11
     Mean Nutrient Concentration in Ungaged Streams:


     Tributary
Mean Total P
  (mg/1)
     B-l Tete Bayou
     E-l Mill Creek
     F-l James Bayou
     G-l Hunts Creek
     H-l Tiger Branch
     K-l Saunders Branch
  0.086
  0.038
  0.044
  0.046
  0.056
  0.062
   192
   161
   190
   162
Mean Total
  (mg/1)

  0.943
  0.598
  0.657
  1.050
  0.985
  0.637
          Nutrient levels for the above ungaged tributaries are all

     comparable to those levels in the measured tributaries entering

     Caddo Lake.

-------
                                  19
F.    Yearly Loadings:
          In the following table, the existing phosphorus annual
     loading is compared to the relationship proposed by Vollenweider
     (1975).  Essentially, his "eutrophic" loading is that at which
     the receiving waters would become eutrophic or remain eutrophic;
     his "oligotrophic" loading is that which would result in the
     receiving water remaining oligotrophic or becoming oligotrophic
     if morphometry permitted.  A "mesotrophic" loading would be
     considered one between "eutrophic" and "oligotrophic".
          Note that Vollenweider's model may not apply to lakes with
     short hydraulic retention times or in which light penetration  is
     severely restricted by high concentrations of suspended solids
     in the surface waters.
                             Total  Yearly
                          Phosphorus  Loading
                               (q/m2/yr)
     Estimated loading for Caddo Lake                            0.73
     Vollenweider's  "eutrophic"  loading                          0.74
     Vollenweider's  "oligotrophic"  loading                       0.37

-------
                                     20
V.   LITERATURE REVIEWED

     Ketelle, Martha J. and Paul  D. Uttormark.   1971.   Problem Lakes
       in the United States.  U.S. Environmental  Protection Agency
       Project #16010 EHR.  University of Wisconsin, Madison,  Wisconsin.

     Shampine, W. J.  1971.  Chemical, Biological, and Physical  Data  for
       the Major Lakes and Reservoirs in Louisiana.   Louisiana Dept.  of
       Public Works, #5.  Baton Rouge, Louisiana.

     U.S. Environmental Protection Agency.  1975.  National Eutrophication
       Survey Methods 1973-1976.   Working Paper No.  175.   National
       Environmental Research Center, Las Vegas,  Nevada,  and Pacific
       Northwest Environmental Research Laboratory,  Corvallis, Oregon.

     Vollenweider, R. A.  1975.  Input-Output Models With Special
       Reference to the Phosphorus Loading Concept in Limnology.
       Schweiz. Z. Hydrol.  37:53-84.

-------
                                21






VI.  APPENDICES
                             APPENDIX  A



                         CONVERSION FACTORS

-------
                CONVERSION FACTORS





Hectares x 2.471 = acres



Kilometers x 0.621/I = miles



Motors x 3.281 = feet



Cubic motors x 0.107 x 10"  -  acre/feet.



Square kilometers x 0.38C1 ~ square miles



Cubic motors/sec x 35.315 - cubic feet/sec



Centimeters x 0.3937 :: inches



Kilograms x 2.205 ~- pounds



       ms/square kilor.istcr x 5.711 ~ Ibs/square mile

-------
    APPENDIX B



TRIBUTARY FLOW DATA

-------
                                    TRIBUTARY  FLOW  INFORMATION  FOR  LOUISIANA
                                                                                           04/11/77
LA
-------
                                   TRIBUTARY FLOW INFORMATION FOR LOUISIANA
                                                                                          04/11/77
LAKE COOE 2206     CAOOO LAKE




     MEAN MONTHLY FLO*S AND OAILY FLOWS(CMS)




TRIBUTARY   MONTH   YEAR    MEAN FLOw  DAY




2206J1
2206L1
FLOW  DAY
                  FLOW  DAY
FLOW
6
7
8
9
10
11
12
1
2
3
6
7
8
9
10
11
12
1
2
3
4
74
74
74
74
74
74
74
75
75
75
74
74
74
74
74
74
74
75
75
75
75
184.060
4.474
2.294
79.287
35.113
185.759
135.921
84.951
211. 810
101.657
30.299
0.736
0.368
13.026
6.881
36.529
22.370
9.911
44.457
25.542
11.836
o
6
8
7
7
1
7
6
6
24
8
6
10
7
5
10
6
11
8
7
19
211.810
7.192
1.161
29.733
54.935
62.580
176.697
105.905
654.119 22
131.956
34.547
1.133
0.249
4.729
8.212 18
12.884
26.051
17.103
143.850 22
20.813 22
16.933








72.774





3.851



20.586
26.250


-------
        APPENDIX C



PHYSICAL AND CHEMICAL DATA

-------
                 IG-'-I
  DATE
  FDQV
   TO
TI.vE OEPT-!
 OF
DA/  FEcT
74/03/23 10  10  0000
         10  10  OOuS
74/05/31 14  45  OOon
         14  45  0002
74/08/26 09  20  0000
         09  20  0004
74/11/11 09  50  0001!
         09  50  000=3
  DATF.   TIME DEPTH
  FKOM    OF
   TO    DAY  FEET

74/03/23 10 10  0000
         10 10  000s.
74/05/31 I* 45  0000
         14 45  0002
74/18/26 09 20  0000
74/11/11 09 50  0000
         09 50  0 0') S
0 d 0 i 0
wAl tP
TtM>
Ct-iT
lh.0
15. ft
27.6
27.6
29.6
29.6
16.2
16.3
00665
HOS-TOT

M(3/L P
0.055
0.054
0.055
0.056

0.056
0.075
0 0300
DO

MG/L

7.4

7.2
3.6

4.d
t .*
32217
CHLKPHYL
A
UG/L
4.4

2.-J.1

IS. 6
2.4

00 u / 7 0009"
TKCMS^ CNDUCTVY
ctCCnI rIELO
li-iC'nr.S MIC^UMhu
42 9*
94
42 13°
139
33 137
138
SO 61
61
00031
INCDT LT
RF.MNlNG
HEKCENT







32 42 04.0 0^4 0* ib.O
CAiJUu LA'E
4* I £ » 4S
1 lt>!
3
0 0 " 0 '.i
•J <-1
St'
h.20
6.2t;
7.40
7.40
7.20
5.34
5.31
•UtS 2111
0009
0 0 » i 0 00610
r ALK NH3-N
CAC03 TOTAL
M.J/L MG/L
1'JK 0.040
1 0 x 0.060
13 0.0*0
17 0.060
10 0.040
10 0.060
1202
Fftf OE^
U0623
TOT ^jtL
N
MG/L
0.600
0.600
0.700
O.SOO
O.bOO
0.600
T-
00630
NO?f.N03
N-TOTAL
MG/L
0.070
0.080
0.050
o.uo
0.020K
0.020

00671
PHOS-DIS
OWTHO
MG/L C
0.016
0.020
0.020
0.012
0.013
0.017
       K VALUE KNOWN TO BE LESS THAN
               INDICATED

-------
STO^-ET SETrtlEVAL
NATl.
                       fr./ul/ln
                                                                     <• o0 7'jc
                                                                    5 c  •• 1  U 1 . 0 0 -T 4 03 0 D . n
                                                                    i 1 tf^LtS
                                                                    j

DaTE
F -> Q i.'
TO
74/03/23

74/06/03

74/08/26

74/H/ll


TI-.
OF

>E

DAY
10
10
11
11
09
09
10
10
35
35
00
00
40
40
10
10

OEt-l«

FEE!
000 "i
0005
0 0 0 ;i
000-3
oooo
0006
0000
ooos
! I. J I
* a i E -
TC.MI-
ct^\
16
16
26
26
29
29
16
Ib
i'



.6
.5
.b
.3
.2
.2
. _•*
.<*
1)030(1 ou;. ff ufi'j-<.
00 Tr^i-JbP C.-tOuCTvr
5 i C C « I F I F L 0
M'J/L I'«C-tS ^lC40f"-iu
48 91
9.4 9^
30 190
?.o lab
3.6 30 134
3.6 134
7.0 3d 6 u
7.2 SH
•j •') -
*"n

su
6
6
H
7
7
7
C,
5
Ou



.70
.70
.45
.90
.20
.20
.4b
."5
 U U <. 1 'J

CAC03
 «G/L
                                                                                        U009
                                                                                                    DE-1
 00»>10
Nrij-N    TOT KJEL
TOTAL       N
                                                                               10K
                                                                               !•*
                                                                               11
                                                                               11
            0.040
            0.040
            0.040
            0.030
            0.060
            0.050
            0.700
            0. fOO
            O.rtOO
            0. ^00
            0. /OO
            O.SOO
  00630
N02J.N03
N-TQTflL
  MG/L

   0.030
   0.040
   0.020
   0.020K
   0.020
   0.030
                                                                                                                    00*71
OKTiO
MG/L P

  0.013
  0.016
  0.007
  0.009
  0.016
  0.019
                                 32217      00031
  DATE   TIME  DEPTH pr,o?-rOT  CHLRPHYL   INCDT  LT

   TO    DAY   FEET    cui/L P     UG/L     PEHCENr
74/03/23  10  3S  0000    O.OS1       a.7
          10  35  OOO'i    0.050
74/06/03  11  00  0000    0.049      28.1
          11  00  0001                          SO.O
          11  00  0004                           i.o
          11  01  000*    U.0b2
74/OH/26  09  40  0000               20.5
74/11/11  10  10  0000    o.06r       2.5
          10  10  000^    O.Oo?
    K VALUE KNOWN TO BE LESS THAN
             INDICATED

-------
STO'-iT
NATL  F.
E P A - L A S
                                     <• o 0 7 0 3
                                    3?  41  38.0 0v4  01  4 b. 0

DATE
F-'0«
TO
74/03/23

74/05/31

74/08/26

74/H/ll


TI>,
OF
QAV
10
10
14
14
09
09
09
09

E C


>EPT--i

•'i ij U 1 l)
*' 4 T 1 4
TtMP
FEtT Cc.^T
45
45
30
30
55
55
30
30
000"
OOu*
001)0
0003
0000
0005
Ouor.
000^
17.5
17.4
27. >4
27.9
3U.4
30.4
16.d
16. b
0 0300
 00

MG/L
                                      7.2

                                      6.6
                                      6.0
                                      5.4
                                      5.2
                                      5.*
                                             00077
                                                      FIELD
                                            IiNCntS
               3b

               36
16V
169
222
222
261
261
 96
 99
llt'r-ALES
3
0 0 4 o u 0 0 <* 1 0
2111202 '
0010 KEtT UEt'TM
OOblO 00^2^^ 00630
P>H 1 iLK Nrl3-N TOf KJEL

SIJ
6.40
6.25
7.20
7.40
7.10
7.10
5.43
S.35
CAC03
Mb/L.
21
!•*
10K
10^


10K
1QK
TOTAL
MG/L
0.060
0.050
0.060
0.050


o.oso
0.330
N
MG/L
0. ^00
o. too
0.900
0.700


O.rtOO
0.900
N02&N03
N-TOTAL
MG/L
0.050
0.050
0.060
0.050


0.020K
0.020
00671
PHOS-OIS
0«T«0
MG/L p
0.016
0.013
0.010
0.012


0.012
0.015

DATE
FOOM
TO
74/03/23

74/05/31

74/08/26
74/11/11


TIME DEPTH
OF
i)AY FEET
10 45 0000
10 45 0006
14 30 0000
14 30 0003
09 55 0000
09 30 0000
09 30 OOOS
006^5
PHOS-TOT

MG/L P
0.035
0.039
0.051
0.0*0

u.O^e
(i.C7v
32217
CHLRHHYL
A
UG/L
b.4

3M.1

11.3
7.1

00031
INCOT LT
^Fl-iNlNG
PERCENT







      K VALUE KNOWN TO BE LESS TKAM
               INDICATED

-------
STOPdT Pc.T = i:. v
                     t'  t h / 0 1 / 1%
                                                                      <»6070<*
                                                                    3c  tj  £3.0 O'jJ Sr 19.
                                                                    CADOO
  DATE    Tl-'t
  FROM     Of1
   TO     OAT   FEET

74/03/23  10  55 0000
          10  55 0005
74/06/03  11  15 OOOn
          11  15 0004
74/08/26  10  10 0000
74/11/11  10  30 0000
          10  30 OOU5

D'.OIO
MtE*
TE.IP
CtNT
17.0
16.9
26.3
25.9
28.8
17.2
17.2

00300
DO

MG/L

9.*

7.2
7.0
8.4
8.4

i.i >077
T i 4 N' b> v
StCChI
INCntS
4B

29

24
50


oofl--
C.>jDUCTvY
FIELD
MICwOMhG
10«
109
17<*
iai
130
109
109
3
0 0 <» 0 0
f*f

:•>"
7.40
^.80
6.2U
7.55
7.20
6.43
n.34

00<*10
T ALK
CACOJ
MG/L
\*
\*
10
10

Ifo
lu
0009
00610
NnJ-N
TUTAL
MG/L
0.020
0.020
0.040
0.040

0.030
0.030
FEtT uEPTH
00^ ^5
TOT K.jtL
N
MG/L
0.600
O.*500
0. 700
0.600

0.800
0.600
00630
N02&N03
N-TOTAL
MG/L
0.030
0.020
0.030
0.040

0.020K
0.020
00671
PHOS-OIS
OPTrtO
MG/L P
0.008
0.007
0.006
0.006

0.008
0.009
                        00665
   DATE    TIME DEPTH PHOS-TOT
   FROM     OF
    TO     OAV  FEET   MG/L  P
74/03/23

74/06/03



74/OB/26
74/11/11

10
10
11
11
11
11
1"
10
10
55
55
15
15
15
15
10
30
30
0000
0005
0000
0 0 0 1
0004
0005
0000
oooo
0005
0
0
0


0

0
0
.045
.039
.051


.050

.043
.047
10.

95.



25.
11.

1

0



0
9

  32217      U0031
CHLRPHYL   INC01  LT
   A       RE.-1NI.NG
  UG/L     PERCENT
                                               so.o
                                                1.0
      K VALUE KNOWN TO BE LESS THAN
              INDICATED

-------
STO-tT  RETrUtVAL  IJATE
NATL  ElJTHOPr-ICATIl>i S
EPA-LAS
                    7 <-./<) 1/1-j
 480705
3d <*1  40. u
CAODO  LA / 43.0

DATE
FPO'-'
TO
74/03/23

74/06/03

74/03/26

74/11/11


DATE
FHQ'i
TO
74/03/23

74/06/03



74/08/26
74/11/11


TI'-'E OEPT*-
OF
DAY FEET
11 15 0000
11 15 OOOS
11 30 0000
11 30 0005
10 25 0000
10 25 0005
10 50 0000
10 SO 0005

TIME DEPTH
Of
DAY FEET
11 IS 0000
11 15 OOOS
11 30 0000
11 30 0001
11 30 0004
11 30 OOO^i
10 25 0000
10 50 0000
10 50 0005
0 0 0 1 0
«ATtP
Tf-lf-
Ct. :JT
16.9
16.6
27.2
26.4
29.4
24.4
16.7
16. a
00665
HHOS-TOT

MG/L K
0.038
0.038
0.046


0.051

0.057
0.0*8
0 0 300
00

MG/L

H.6

7.0
6.0
5.4
7.6
7.4
32217
CHLRHHYL
4
UG/L
10.9

16.9



27.6
6.0

u (i o 7 ;
T H A N S °
^ECCnl
iNOtS
42

4b

22

37

00031
INCOT LT
^FMNlNG
PEKCtlNT



50.0
1.0




0 0044
CMDUCTVr
FIELD
MIOOK^G
106
108
18b
186
12t>
132
71
vo













                                                                0(1400
                                                                 Si!

                                                                  6.^0

                                                                  7.85
                                                                  7.JS
                                                                  7.20
                                                                  7.10
                                                                  5.71
                                                                  b.tol
tS

0 0 <* 1 U
T AI_^
CAC03
MG/L


U
11
11
10K
16
211!
ooov
00610
TOTAL
MG/L
0.020
0.04U
0.040
0.040
0.060
0.030
12i)
-------
                  OATt 76/01/16
EPA-LAS VEGAS
 •*8t'706
32 42 20.0  095  55  14.0
CAtfuO LAKE
DATE
FPO*
Tn
74/03/23

74/06/03

74/08/26

74/11/11


DATE
FROM
TO
74/03/23

74/06/03


74/08/26
74/11/11

TIME
OF
DAY
11
11
11
11
10
10
11
11

25
25
40
40
40
40
on
on

TIME
OF
DAY
11
11
11
11
11
10
11
11


25
25
40
40
40
40
00
on
DEPTn
FEET
0000
000^
ooon
0005
0000
0005
ooon
OOO1-.

DEPTH

FEET
ooon
0005
0000
0001
0005
0000
0000
OOOS
n o o 1 0
WATE*
TE.MP
CENT
16.9
16.8
27.5
26.7
28.9
29.9
17.0
16.9
00665
PHOS-TOT

Mu/L P
0.035
0.042
0.051

0.056

0.056
0.069
11EHALES 2111202
J 000V FEET uE
00300 IMI0/7 0009*. 00400 00410 00610 00623
DO TRANSP CNDUC1VT Ph T ALr* NM3-N TOT KJEL
SECCHI FIELD CACOS TOTAL N
MG/L INCHES MICHOMHO so MG/L MO/L MG/L

8.

7.
6.
5.
8.
H.
32217
37 ID* 7.20
8 105 6.90
24 201 7.30
0 199 7.80
0 20 134 7.10
0 134 7.10
2 46 97 6.09
0 97 S.88
00031
10 0.040 0.600
10 0.040 0.600
11 0.050 0.800
10 0.030 0.700


15 0.030 0.700
12 0.040 0.600

CHLRPHYL INCOT LT
A
UG/L
11.

25.


22.
H.

REMNlNfi
PEKCENT
0

3
50.0
1.0
4
0











                                                                                                          00630     00671
                                                                                                        N02J.N03   PHOS-OIS
                                                                                                        N-TOTAL    OHT40
                                                                                                          MG/L     MG/L P
                                                                                                           0.030
                                                                                                           0.030
                                                                                                           0.020
                                                                                                           0.020
                                                                                                           0.020K
                                                                                                           0.020
                                                  O.OOfi
                                                  0.003
                                                  0.007
                                                  0.006
                                                  0.011
                                                  0.017
     K. VALUE KNOWN TO BE LESS THAN
             INDICATED

-------
       APPENDIX D

TRIBUTARY AND WASTEWATER
  TREATMENT PLANT DATA

-------
STCRST SET&IE^Al  CATc 75/11/28
NATL EUTROPI-ICiTIGN
ERA- LAS  VfGiS
HATE
FRO*
TO
74/06/09
74/07/C6
74/08/06
74/09/07
74/IC/C5
74/11/01
74/12/07
75/01/06
75/02/06
75/02/24
75/03/24
TTPE f
CF
CAY f
09 20
12 45
13 37
12 00
CS 50
15 10
CE 1C
CS 30
09 45
C£ 45
09 20
               F6F.T
 2206AI
32 42 2C.O OS3  55  00. C
hlLLCn PASS C-,ri*
22      15 ViC'JKiNGSPC'U
G/CiOCC LiKs
CiCOO LiK- SP!LL«AV  .25  f:  A3CVS BLACK B
                      211120*
                     CCOO FthT  DcPTH
C0630
NC26NC3
N-TCTAL
MG/L
0.012
0.012
0.012
O.J23
0.032
0.024
0.008
0.016
0.024
0.016
0.016
CC625
T'JT KJtL
N
fG/L
0.700
1.200
C.800
0.750
1.100
C.8CO
0.600
C.400
C.500
0.650
2.000
CC61C
NH2-N
TCTAL
f-G/L
C.020
0.025
0.015
0.02C
C.035
C.C4C
0.015
0.016
C.C24
0.024
C.040
00671
FHGS-Di S
ORTl-G
NG/L P
0.01C
0.015
O.OC5
C.C05
0.0 1'C
C.C1C
C.015
C.01C
C.03C
0.016
0.016
00665
FHCS-TGT

fC/L F
C.C55
0.110
0.075
C.C40
0.030
C.040
C.050
C.030
C.C40
0.060
0.040

-------
STO&F.T PSTRI6VAL  DATE  75/li/2f
NATL EUTFCFHCATICN  SURV-Y
EPA- LAS VtGAS
                                                          220631
                                                         32 40 40.0 094 01  40.C
                                                         TtTr EAYfA
                                                         22       7.5  POTTERS  PT
                                                         T/CACCC
                                                                                 ? N't SV. SI HW 169 JCT
                                                                                        2111204
                                                                                       0000 CECT  DEPTH
DATE
F'Ulf    ("F
 TO    DAY
             00630
     HEPTH NC2GN23
           N -TOTAL
     FSfiT    MG/L
                                 00625
                               TCT KJEL
                                  N
                                 NG/L
                                         CC610
TCTAL
 MC-/L
         OC671
       PHOS-CIS
        CRTHC
        MC/L  F
                              CC665
                            FhCS-TCT

                             HG/L  P
74/06/08
74/07/06
74/08/08
74/09/07
74/10/07
74/11/01
74/12/07
75/01/06
75/02/06
75/02/24
75/03/24
12 20
12 15
12 53
12 30
10 50
14 5C
09 41
1C CC
OS 15
C9 00
C? 5C
                      0.036
                      0.012
                      0.013
                      0.068
                      0.324
                      0. C20
                      O.C24
                      0.016
                      0.016
                      0.016
                      0.024
C.800
C.800
1.100
1.100
0.900
1.300
C.700
0.900
C.400
0.400
1.700
0.040
0.015
0.040
C.165
0.050
C.165
C.020
0.032
0.032
0.024
0.032
            0.025
            O.C25
            0.045
            C.035
            0.030
            0.020
            C.C15
            0.015
            0.032
            C.Olt
            0.024
0.095
C.090
0.160
0.115
C.130
0.130
C.C60
C.040
0.040
C.C40
0.050

-------
STDRFT RETFIEVAL  DATE  75/11/2S
N4TL EUTSOPHCAT10N  S(j*Vi'Y
EPA- LAS VEGAS
 220fcCi
II 39 45.C  0<54  07  25. C
hA^ISCi 5AYGU
22      7.5 .F.CTTCRS  FT
T/CADCO LAKE
2N03Y ?C 3SCG 1.25 Mi  W ST  H'«Y 2457 JCT
ii^PALtS              2H1204
•V                    CCOC FccT  OcPTH
OATE
PROP
TO
74/06/08
74/07/06
74/08/08
7W09/C7
74/10/07
74/11/01
74/12/C7
75/01/06
75/02/Ofc
75/02/24
75/03/24
75/04/C5
TTHt r.tPTl
TF
CAY FfEET
11

10
1C
11
12
12
11
11
11
11
1C
02

55
15
45
30
44
35
CC
CC
45
35
00650 CC625
- NC2&NC3 TCT KJ?L
N-TGTAL N
MG/L
0.
C.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
044
140
116
084
032
032
OCS
048
016
016
024
010
KG/L
0.
C.
0.
0.
C.
C.
1.
C.
0.
C.
1.
1.
500
500
300
300
400
SCO
200
400
300
600
000
300
CC61C 00671 00665
M-2-N PHCS-CIS PI-CS-T-T
TCT4L CFTH:
fG/L
0
0
0
0
C
C
C
C
0
0
C
0
.035
.025
.015
.045
.030
.C25
.020
.C24
.024
.032
.032
.020
MG/L F
0.035
C.050
0.065
C.09C
0.055
0.065
0.04C
0.015
0.032
O.C24
C.C24
0.015
NG/L P
0
0
C
0
0
C
0
C
C
0
C
0
.095
.120
.100
.140
.090
.210
.110
.C40
.C50
.060
.060
.020

-------
     l PtTMfcVAL CATC 75/11/22
N4TL FUTRQPHCATION SIRVeY
£04- LAS VtGAS
 2206C1
22 46 45.C C?4 05 22.C
K IT C H : Cs C S c ? K
22      7.5 SMITH. AM:
T/C4DCC LAKE
2NL3Y Rf EhCG 2.25 Mi S ST HWY 49  JCT
       S             2111204
                    OCOC FS:T  C^PTH
DATT
FRJ^
rn
74/06/09
74/07/Ot
74/08/08
74/09/07
74/10/07
74/11/01
74/12/C7
75/01/06
75/02/C6
75/02/24
75/03/24
Til";
OF
CAY
11 25
13 5C
11 45
11 CC
1C 25
13 15
1C 54
11 00
1C 3C
1C CC
10 55
              FE£T
00630
NC2CNC3
N-TCTAL
MG/L
0.032
0.068
0.040
0.060
0.024
0.032
0.003
0.024
0.016
0.024
0.043
OC625
TCT KjcL
N
NG/L
0.600
C.500
0.900
0.500
C. 300
0.700
C.600
C.400
0.800
C.300
0.800
CC61C
M-3-N
TCT..ML
^G/L
0.036
0.025
C.C70
C.055
C.G15
C.C45
0.020
C.C24
0.040
c.oee
C.C48
00671
PHCS-CIS
3J5TI-0
MG/L P
0.016
G.025
C.02C
0.015
C.010
C.G2C
C.010
C.C1C
0.016
c.ooe
c.ou
00665
FHGS-TGT

*G/L P
0.045
0.060
C.C65
0.025
0.025
C.C70
0.030
C.C20
C.020
0.020
C.040

-------
STGRfT KcTRIcVAL  CATt  75/11/26
NiATL tUTRCPHICATICN  SIPV£Y
tPA- LAS  VEGAS
 2206E1
32 50 50.0 094 07  20. C
22
                                                                           7.
2MCHY -O 6POG 3  Ml
UlPALrS
                     c  ST  H*Y
                      211UCH
                     0000  fc-i-T
                                                                                                  ?  JC T

                                                                                                   CcPTh
CATF
F^HI*
TO
74/06/08
74/07/06
74/08/10
74/09/07
74/1C/05
74/10/18
74/11/01
74/12/06
75/02/08
75/02/22
75/03/22
75/04/05
75/04/19
00630 00625
TIME OEPTH iMij2£*;03 TOT KJSL
CF N -TOTAL N
CA1
14
12
1C
10
C^
14
13
12
11
11
1C
12
13
r FEcT
25
50
5C
35
3C
30
00
CC
50
3C
30
39
40
MG/L
0.044
0.080
0.052
0.048
0.024
0.024
0.024
O.OC8
0.016
0.003
0.009
0.005
0.035
h'G/L
0.700
0.400
C.700
0.400
0.300
C. 500
0.600
0.700
C.6CO
0.400
0.550
0.300
1.250
C061C OC671 CC665
Nt-3-N FHCS-CIS PhCS-TOT
TCTAL CSTH'J
fG/L
C.C25
0.025
0.100
0.030
0.045
C.C55
C.025
0.027
0.024
0.024
0.018
C.015
C.090
KG/L f
C.C2C
C.020
C.C4C
C.C15
0.010
C.Ci.5
0.015
0.010
0.006
0.008
O.C05
C.C10
0.015
fC/l P
C.C65
C.CfcO
0.060
C.C30
0.040
C.030
C.C40
0.040
C.020
0.045
0.030
C.C10
0.030

-------
STfi^FT PC-TRI6VAL  DATfc  75/11/26
NATL eUTSOPHICATIGN  SLRVLY
PPA- 1.4S  VEGAS
 2206F1
32 51 15.C CS4 06  40.C
JAMiS E4YQU
22       7.5  TP;r.S
T/CACC-j  LAKE
2NOt}Y or eacC 4 MI NE ST  hWY  4S JC T
11_PAL=3              2111204
4                    CCOC  reel  DzPTh
TATF
TO
74/06/08
74/07/06
74/08/10
74/09/07
74/10/05
74/10/18
74/ll/lC
74/12/06
75/01/11
75/02/08
75/02/22
75/03/06
75/03/22
75/04/05
75/04/1S
00630 CC625
TIKT TdPTI- NC2CNC3 TCT KJfL
OF N-TOTAL N
CAY FE£T
14
12
10
Cc.
OS
10
11
13
ce
14
09
11
11
09
1C
35
45
40
25
15
40
CC
00
3C
5C
30
05
30
30
5C
MG/L
0.
0.
0.
0.
0.
0.
096
080
008
044
040
024
0.012
0.
0.
0.
0.
0.
0.
0.
0.
008
008
008
008
016
009
015
035
^G/L
0.
C.
1.
0.
C.
0.
C.
C.
0.
C.
0.
C.
C.
0.
1.
500
600
600
500
400
400
500
800
300
650
400
900
500
350
050
CC61C 00671 00605
NhB-N PHOS-CIS PHGS-TGT
1UAL GRTHO
PG/L
0.
C.
C.
0.
C.
C.
0.
C.
0.
0.
0.
0.
C.
C.
C.
030
020
025
040
C25
055
035
C65
016
016
024
032
C16
CIS
050
MG/L
0.
0.
C.
C.
0.
C.
0.
C.
0.
C.
C.
0.
0.
0.
0.
F
020
020
QIC
020
015
020
015
015
010
016
016
008
010
015
020
fG/L F
C.C50
O.C65
C.120
0.035
0.040
C.C35
0.040
C.032
C.C30
0.025
C.C50
0.060
0.030
0.015
C.040

-------
STfUET RETRIEVAL  OATfc  75/11/26
NATL EUTROPI-ICATICN  SlJ*V"Y
SPA- LAS  VEGAS
                          2206G1
                         •2  51  5C.C C94 C3 45.C
                         rUNTS  C«rcK
                         22       7.5 IR::S
                         T/CACCO  LAKH
                         2Nu*Y  »C cPOG ^ M T w 'jc VIVIAN
                         II-:P*L = S             2HiiO't
                         4                    OCOC r^i:l  OcPTH
                       00630     CC625
  OATfc    TIME  CcPTI-  NC2CH03   TCT KJ2L
  FROM    u=         N-TGTAL      f\
   TO     DAY   F5ET     MG/L       KG/I
 CC61C     OC671      C0665
M-2-N    FHOS-CIS   Pt-CS-TjT
TCTAL     CRTI-;
 t-G/L     MG/L F     ^G/L  f
74/06/08
74/07/06
74/08/10
74/09/07
74/10/05
74/10/18
74/11/10
74/12/06
75/01/11
75/02/08
75/02/22
75/03/22
75/04/05
75/04/19
14
12
10
09
ce
09
1C
14
07
OS
ce
1C
08
10
50
3 5
30
10
3C
30
CC
00
3C
25
40
3C
30
30
0.028
0.080
0 .044
0.048
0.048
0.040
0.012
0.008
0.003
O.Olfc
0.024
0.018
0.020
0.055
1.900
2.70C
0.950
0.600
C.400
0.700
l.CCO
C.700
0.800
1.1 CO
0.500
0.650
C.450
1.800
C.040
C.240
C.065
0.032
C.02C
C.C25
0.035
C.C2C
0.024
0.048
C.048
0.033
C.Q3C
0.115
0.025

C.C3C
0.015
0.015
C.C15
0.015
C.G20
0.015
c.ooe
0.016
0.010
0.015
0.020
C.033

C.100
0.033
0.045
O.C45
0.060
C.C60
C.C40
0.030
C.C40
0.040
0.015
C.C50

-------
STGSFT RfcTSlFVil  GiT?  75/11/28
N4TL EUTROPhlCA IIGN  SURVEY
fP4- L*S VC-G«S
                                                                  22061-1
                                                                 32 47 15.3 093 58
                                                                 T IG.-:r\ 8".£NCH
                                                                 22      la VIVIAN
                                                                       ; LAK.:
                                                                      ST hwY I 5.5
                                                                 11 :?«i -s
                                                                  i.O
                                                                  :  s  CITY ct
                                                                    21 11204
                                                                   CCCC  rr^T
                                                                                                   TP^  V!V!

                                                                                                   Cc?Th
OiTc
F i? 0 f
 TO
               FEET
  C0630     CC625      CC610      00671     OQtt5
NC2CNC3   TO I KJF-L    NH3-N     FHCS-CIS  FHCS-T3T
N-TGTiL      N        TCTAL      bRThF
  ,«G/L      PG/L       K-/L      HC-/L F    ^C-/L F
74/06/09  09  40
74/C7/C6  12  CC
74/08/08  12  13
74/09/07  11  35
74/10/C7  1C  15
74/11/01  12  40
74/12/07  1C  20
75/01/06  1C  30
75/02/06  10  00
75/02/22  C?  2C
75/03/24  10  20
                      0.040
                      0.016
                      0.008
                      0.06d
                      O.Olt
                      0.032
                      0.008
                      O.OC3
                      0.039
                      0.008
                      0.024
             i.200
             0.900
             1.200
             1.400
             C.5CO
             1.400
             0.600
             C.900
             C.800
             0.700
             1.000
C.060
0.030
C.025
0.185
0.020
C.075
0.025
C.040
0.048
0.024
C.C48
0.021
0.015
0.015
O.C25
0.005
C.C25
0.015
C.01C
C.C06
0.008
c.oce
C.115
0.065
C.07!>
O.C75
0.020
C.100
C.C40
C.020
C.030
0.050
C.030

-------
STOScT RETRIEVAL  CATF 75/11/26
NiTL EUTPCPHC4TICN SURVcY
£OA- US  VEGAS
D-'. TC-
F311C
TO
74/06/CE
74/07/06
74/08/08
74/09/07
74/10/07
74/11/01
74/12/07
75/01/06
75/02/06
75/02/22
75/03/24
nyr
OF
C«Y
1C CC

11 20
1C 35
11 15
13 OC
12 15
12 30
11 CC
10 30
11 25
               rftT
 2206J1
12 41  5C.O  OS4 11 20.C
CYPSESS  E4YCL
i2  .     HAP.AlSJN OC
T/CACCC  LiKc
BSCr,  5T  I-*Y  43 2.25 ,«! NW  CP  KA'NACK
llrPiLtS              2111204
4                    0000 ?S.cT   O.PTH
00630
iSC2£Nu3
N-TOTAL
PG/L
0.072
0.012
0.004
0.05t
0.056
0.040
0.024
0.048
O.Olt
0.032
0.016
00625
TCT K.J;L
N
^G/L
C.5CO
0.800
0.600
C.950
0.500
0.400
C.500
0.700
C.900
0.600
1.100
CC61C
M-3-N
TC1AL
XC-/L
0.040
C.C15
0.010
C.110
0.025
0.045
C.01C
0.040
C.024
C.C32
C.032
OC671
FhCS-CiS
CRTH:
MG/L ' P

C.020
' 0.005K
0.020
C.C1E
C.030
C.C20
C.02C
0.016
C.Clt
0.016
CC665
PhCS-TjT

^G/L F
0.025
0.080
C.C50
0.055
C.C35
0.07C
0.050
0.045
0.060
C.C60
C.040
          K VALUE KNOWN TO BE LESS THAN
                   INDICATED

-------
      T  R^-TnlcVAL  CAT-.-  75/11/23
NATL  EUT3TPHICaTION  SURVEY
.'PA-  LAS  VfCAS
 2206K1
32 4C 43.0 094 01  40.0
SAUNDtAS  bnA,Y_H
2£       7.5 FCTT:?S  FT
T/CAOCi.  LAKJ
2;o.:.Y :•;•:  e?.cc- o.=  ^!  v>
D-iTF
FRCI»
TO
74/06/08
74/07/C6
74/09/07
74/10/C7
74/11/01
74/12/07
75/01 /Ct
75/02/06
75/02/24
75/03/24
T 1 v r f
CF
CAY 'r
11 15
1C 45
1C 30
12 30
12 20
12 50
11 3C
11 15
11 15
12 1C
             r CtPTh

0063C
NC2END3
N











-TOTAL
MG/L
0.043
0.116
0.064
0.024
0.024
0.024
0.016
0.040
0.040
0.032
CC625
TOT KJ3L
N
^G/L
0.500K
C.7CO
C.300
0.200
C.300
0.700
0.500
C.200
0.350
1.600
CC61C
NI-3-N
TCTAL
^G/L
C.03C
0.015
C.C20
0.005
0.015
C.C2C
0.032
C.C24
0.029
C.032
00671
FHCS-CI S
GPTHC
MG/L F
C.035
0.045
C.C45
0.035
C.025
C.C15
0.020
C.016
0.017
0.024
00665
PhCS-T^T

f-G/L P
C.I 00
0.075
C.C65
O.C60
0.120
C.C50
0.050
0.030
C.030
0.040
                       v> CF ST P
                       211120^
                      CCCO FtcT
                                                                                                        DcFTH
          K VALUE KNOWN TO BE LESS THAN
                   INDICATED

-------
STflSET PETPIcVAt GATE 75/ll/2t
NATL EUTRGPHCATICN SURVbY
EPA- LAS  VtGiS
 2206L1
32 48  27.0  CS4 Cl 59.C
fG'NTtS-Y  LAKE  OUTUrT
22       7.5 TR-'.-S
I/CADCC  LAKE
BNK UM'VFRCV£C ? C XING S bC  16
USPALcS              211120^
4                    0000 FtiT
Oiff-
FKL!*
TC
74/C6/C8
74/07/06
74/08/10
74/09/07
74/10/05
74/10/18
74/11/10
74/12/06
75/01/11
75/02/08
75/02/22
75/03/07
75/03/22
75/04/1?
00630 00625
ITVf CcPTI- NC2CN03 TCT KJ6L
(.••F N-TCTAL N
C*1
13
13
11
14
10
14
12
15
13
10
1C
11
13
14
1 FC-ET
45
20
10
30
30
40
00
00
00
40
30
3C
30
50
MC/L
0.112
0.020
0.020
0.048
0.024
0.032
0.012
0.016
0.008
0.008
0.008
0.008
0.009
0.020
fG/L
C.500
c.aoo
0.600
C.500
0.400
0.400
0.600
0.600
C.600
C.300
1.000
C.7CO
0.500
0.850
CC61C CC671 CC665
M-2-N fHCS-CiS PI-CS-IJT
KTAL CPTHC
fC/L
C.040
C.C15
0.070
0.035
0.015
0.015
C.G20
C.025
0.016
C.C16
0.040
0.016
0.015
0.035
MG/L P
0.020
C.02C
0.005K
0.015
C.C15
0.010
0.015
C.010
0.010
o.oce
0.008
0.016
o.cc?
0.015
PG/1 P
0.060
O.C70
0.035
0.040
O.C35
0.032
0.050
C.040
0.030
C.C30
C.C60
0.050
C.C30
0.040
                                                                                                     JjPTh
    __   K VALUE KNOWN TO BE LESS THAN
                  INDICATED

-------
ST03ET RETRIEVAL DATE 75/11/28
NATL EUTROPHCATION SURVEY
EPA- LAS  VEGAS
 2206XA           PC2206XA
22 47 C5.0 CS4  2C  CC. C
                                                                                           TX
P002866
                                                                    22       7.5
                                                                    T/CADDJ  LAK£
                                                                    BLACK  CYPStSS  BAYOU
DATE
Tu
74/10/15
74/11/15
74/12/02
75/C1/18
75/02/05
75/03/12
75/04/05
75/05/13
75/06/C4
75/07/03
75/08/10
00630
TIKC CtPTt- NG2CN03
OF N-TGTAL
DAY FPET
09
14
14
12
10
09
11
16
CS
14
13
30
3C
00
50
30
00
CC
30
CO
CC
00
MG/L
0.280
0.320
0.320
0.160
0.160
0.080
0.050
0.150
0.100
0.1CO
0.150
00625
TCT KJcL
N
MG/L
5.600
6.4CO
6.600
10.500
1.700
13.000
14. SCO
6.500
5.000
9.200
6.200
lU'PALES 2141204
4 . CCOC FctT
CC61C OC671 00665 50051 50053
NH2-N FHQS-CIS PhCS-TOT FLCh CCNCU1T
TCTAL CPTH3 RAT; FLCh-MGC
PG/L
C.590
0.720
C.860
2.200
C.360
2.6CC
4.800
C.2CO
0.050K
C.130
0.325
MG/L P
6.200
4.40C
4.2CO
4.500
0.245
4.SOO
5.100
2.SOC
2.500
5.100
6.70C
fG/L f IKST fGC MCNTHLY
6
4
5
5
C
5
5
3
7
6
7
.600
.700
.500
.500
.520
.900
.900
.600
.200
.000
.200
0.30C
0.350
0.300
0.400
1.400
0.35C
0.300
1.400
i.eoc
0.400
0. 200
C
0
0
C
0
C
C
1
1
0
0
.3CO
.300
.300
.300
.400
.350
.3CO
.400
.800
.400
.SCO
                                                                                                     DEPTH
    	   K VALUE KNOWN TO BE LESS THAN
                  INDICATED

-------
STC=9T  PETFIcVAL CiTc 75/11/28
N.ATL  EUTVTPl-ICATtCM Sl=V:EY
   -  LiS  V£C-£S
 220621           T?2iC621
32 41 15.0  092  57 2C.C
y-CIirtl NGSP'T-r T
22       la  MC-- I \GSPCRT
C/CACCC  laK-
PCCC650
00630 00625
P;iTF TIM? DcPTH NG2£iN03 TOT KJtL
F«r>|k (.1 N -TOTAL N
TO
74/09/06
CPIT)-
74/09/06
74/10/07
CP( T)-
74/10/07
74/11/05
C P ( T ) -
74/11/05
74/12/05
cpm-
74/12/05
75/01/05
CP(T)-
75/01/05
75/02/05
CP(T)-
75/02/05
75/03/05
C P ( T ) -
75/03/05
75/04/06
CP(T)-
75/04/06
75/05/05
CP(T) -
75/05/05

11

16
11

16
11

16
11

16
11

16
11

16
11

16
11

It
11

16
V FEET
00

CC
00

cc
00

cc
00

cc
00

cc
00

cc
00

cc
00

cc
00

oc
MG/L fG/i

0.040 28


0.400 34


1.120 7


0.880 12


0.640 12


0.640 8


0.720 8


2.640 17


0.400 15


.000


.000


.900


.000


.000


.000


.600


.500


.000

CC61C
TCT4L
!»C/L

15.000


16.000


2.500


7.60C


4.400


2.600


2.880


1.100


2.500

OC671
FHCS-:;S
O'f Tt-
yc-/L

1C.


?.


c.


3.


1.


1.


C.


C.


c.

o
F

000


780


915


30C


55C


200


71C


44C


77C

CADDO LiKi
ilc°4L £S
CC665 50051
Ft-CS-TOT FLCW

NC-/L P

12. £00


12.000


2.000


4.400


3.300


4.400


1.7CO


6.400


2.0CO

3A1
INST

C.


C.


C.


0.


c.


c.


c.


0.


c.

,:
fGC

C6C


C6C


C6C


C6C


C6C


C6C


C6C


C6C


C6C

OJO
5CC53
CCNOUIT
rL•:^^-^GC
."CNTHLY

C.C65


C.C65


C.C65


C.C65


C.C65


C.C65


C.C65


C.C65


C.C65


-------
         APPENDIX E

PARAMETRIC RANKINGS OF LAKES
   SAMPLED BY NES IN 1974

STATES OF LOUISIANA AND TEXAS

-------
LAKE DATA TO BE USED IN RANKINGS
LAKE
CODE  LAKE NAME

2301  ANACOCO LAKE

2202  RRUIN LAKE

2203  LAKE 8ISTINE4U

2204  BLACK SAYOU

2205  9UNDICK LAKE

2207  COCODRIE LAKE

2208  COTILE LAKE

2209  CONCOROIA LAKE

2210  CROSS LAKE

2211  D'ARBONNE LAKE

2212  FALSE RIVER LAKE

2213  INDIAN CREEK

2214  SALINE LAKE

2215  TURKEY CREEK LAKE

2216  LAKE VERRET

2217  LAKE VERNON

2219  BLACK LAKE

2220  COCODRIE

4807  CADDO LAKE
MEDIAN
TOTAL P
0.031
0.057
0.061
0.046
0.157
0.090
0.037
0.076
0.057
0.038
0.062
0.031
0.111
0.176
0.163
0.018
0.077
0.106
0.049
MEDIAN
INORG N
0.080
0.250
0.100
0.090
0.135
0.400
0.100
0.080
0.060
0.100
0.130
0.150
0.350
0.170
0.100
0.120
0.150
0.050
0.070
500-
MEAN SEC
455.833
450.333
458.000
453.417
469.667 ,
479.000
442.333
468.333
475.250
458.250
442.500
458.333
493.000
477.833
481.428
436.667
454.000
478.333
463.562
MEAN
CHLORA
8.700
16.350
12.933
17.818
20.467
35.300
12.650
32.950
38.385
6.800
24.550
21.467
15.333
21.967
62.028
4.900
12.733
33.433
20.125
15-
MIN 00
10.400
15.000
13.200
12.200
10.600
7.700
14.000
14.800
11.400
13.200
14.900
14.800
9.600
14.600
12.000
14.400
11.600
11.800
10.000
MEDIAN
DISS ORTHO °
0.007
0.012
0.018
0.009
0.073
0.026
0.011
0.009
0.010
0.011
0.023
0.010
0.025
0.033
0.056
0.007
0.015
0.014
0.008

-------
PERCENT OF LAKES WITH HIGHER VALUES (NUMBEK OF LAKES WITH HIGHER VALUES)
LAKE
CODE  LAKE NAME
2201  ANACOCO LAKE
3202  BRUIN LAKE.
2203  LAKE BISTINE»U
2204  SLACK BAYOU
2205  flllNDICK LAKE
2207  COCODRIE LAKE
2208  COTILE LAKE
2209  CONCORDIA LAKE
2210  CROSS LAKE
2211  D'ARBONNE LAKE
2212  FALSE RIVER LAKE
2213  INDIAN CREEK
2214  SALINE LAKE
2215  TURKEY CREEK LAKE
2216  LAKE VERRET
2217  LAKE VERNON
2219  BLACK LAKE
2220  COCODRIE
4807  CAOOO LAKE
MEDIAN
TOTAL P
92
61
50
72
11
28
83
44
56
78
33
92
17
0
6
100
39
22
67
{ 16)
( 11)
( 9)
( 13)
( 2)
( 5)
( 15)
( 8)
( 10)
( 14)
( 6)
( 16)
( 3)
( 0)
( 1)
( 18)
( 7)
( 4)
( 12)
MEDIAN
INORG N
83 (
11 (
58 (
72 (
33 (
0 (
58 (
83 (
83 (
58 (
39 (
28 (
6 (
17 (
58 (
44 (
22 (
100 (
94 (
14)
2)
9)
13)
6)
0)
9)
14)
14)
9)
7)
5)
1)
3)
9)
8)
4)
18]
17)
500-
McAN SEC
67
83
61
78
33
11
94
39
28
56
89
50
0
22
6
100
72
17
44
( 12)
( 15)
( 11)
( 14)
( 6)
( 2)
( 17)
( 7)
( 5)
( 10)
< 16)
( 9)
( 0)
( 4)
( 1)
( 18)
( 13)
( 3)
( 8)
MEAN
CHLORA
89 (
61 (
72 (
56 (
44 (
11 (
83 (
22 (
6 (
94 (
28 (
39 (
67 <
33 (
0 (
100 (
78 (
17 (
50 (
16)
11)
13)
10)
8)
2)
15)
4)
1)
17)
5)
7)
12)
6)
0)
18)
14)
3)
9)
15-
MIN DO
83
0
42
50
78
100
33
14
72
42
6
14
94
22
56
28
67
61
89
( 15)
( 0)
( 7)
( 9)
( 14)
( 18)
( 6)
( 2)
( 13)
( 7)
( 1)
( 2)
( 17)
( 4)
( 10)
( 5)
( 12)
( 11)
( 16)
MEDIAN
OISS ORTHO P
94 (
50 (
33 (
81 (
0 (
17 (
61 (
81 (
69 (
56 (
28 (
69 (
22 (
11 (
6 (
100 (
39 (
44 (
89 (
17)
9)
* )
14)
0)
3)
11)
14)
12)
10)
5)
12)
4)
2)
1)
18)
7)
8)
16)

-------