U.S. ENVIRONMENTAL PROTECTION AGENCY
           NATIONAL EUTROPHICATION SURVEY
                    WORKING PAPER SERIES
                                         REPORT
                                          ON
                                       LAKE LOWELL
                                      CANYON COUNTY
                                          IDAHO
                                      EPA REGION X
                                   WORKING PAPER No, 783
 CORVALLIS ENVIRONMENTAL RESEARCH LABORATORY - CORVALLIS, OREGON
                             and
ENVIRONMENTAL MONITORING & SUPPORT LABORATORY - LAS VEGAS, NEVADA

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                                 REPORT
                                   ON
                               LAKE LOWELL
                              CANYON COUNTY
                                  IDAHO
                              EPA REGION X
                          WORKING PAPER No, 783
     WITH THE COOPERATION OF THE
IDAHO DEPARTMENT OF HEALTH AND WELFARE
                AND THE
         IDAHO NATIONAL GUARD
              JULY, 1977

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                               CONTENTS

                                                       Page
Foreword                                                i i
List of Idaho Study Lakes                               iv
Lake and Drainage Area Map                               v
Sections
  I. Conclusions                                         1
 II. Lake and Drainage Basin Characteristics             3
III. Lake Water Quality Summary                          5
 IV. Nutrient Loadings                                  11
  V. Literature Reviewed                                16
 VI. Appendices                                         17

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                                  11
                               FOREWORD
     The National Eutrophicatlon 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 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.

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                                  TM
     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 Idaho Department of Health
and Welfare for professional involvement, to the Idaho National
Guard for conducting the tributary sampling phase of the Survey,
and to those Idaho wastewater treatment plant operators who pro-
vided effluent samples and flow data.

     The staff of the State of Idaho Department of Health and
Welfare, Division of Environment, provided invaluable lake docu-
mentation and counsel during the Survey, reviewed the preliminary
reports and provided critiques most useful in the preparation of
this Working Paper Series.

     Major General James S. Brooks, Adjutant General of Idaho, and
Project Officer Major Vestal L. Baker, who directed the volunteer
efforts of the Idaho National Guardsmen, are also gratefully
acknowledged for their assistance to the Survey.

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                    NATIONAL EUTROPHICATION SURVEY
                              STUDY LAKES
                            STATE OF IDAHO
LAKE NAME
American Falls Reservoir
Cascade Reservoir
Coeur d'Alene Lake
Dworshak Reservoir
Hauser Lake
Hayden Lake
Island Park Reservoir
Lake Lowell (Deer Flat Reservoir)
Magic Reservoir
Palisades Reservoir
Payette Lake
Lower Twin Lake
Upper Twin Lake
    COUNTY
Bannock9 Binghams Power
Valley
Benewahj Kootenai
Clearwater
Kootenai
Kootenai
Fremont
Canyon
Blaines Camas
Bonnevilie (Lincoln in WY)
Valley
Kootenai
Kootenai

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LAKE LOWELL (DEER FLAT)
      Tributary Sanpling Site
   X  La>:e Sa-Tipling Site
      Land Subject to Inundation

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                     REPORT ON LAKE LOWELL,  IDAHO
                            STORE! NO.  1608
I.    CONCLUSIONS
     A.    Trophic Condition:*
               Survey data indicate that Lake  Lowell  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.
               Chlorophyll a_ values in  the lake  ranged from 16.0  yg/1
          to 39.2 yg/1  with a mean of 25.4 yg/1.   Potential for primary
          productivity as  measured by algal  assay control yield was
          moderate; however, it should  be noted  that  significant  nutrient
          losses occurred  in assay samples prior to analysis  and  the
          results may not  be representative  of growth responses in  the
          lake.   Of the 13 Idaho lakes  sampled in 1975,  only  1 had
          higher median total  phosphorus levels  (0.070), 5 had higher
          median inorganic nitrogen values (0.070), and  2 had higher
          median orthophosphorus levels (0.015)  than  Lake Lowell.
               Survey limnologists  reported  severe algal  blooms and
          macrophyte growths during August and September visits to  the
          lake.

     *See  Appendix E.

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B.   Rate-Limiting Nutrient:
          The algal assay results indicate that Lake Lowell  was limited
     by available phosphorus.  Lake data suggest nitrogen  limitation
     during the spring (04/08/75) and summer (08/01/75) samplings and
     phosphorus limitation during the fall (09/17/75).
C.   Nutrient Controllability:
     1.   Point sources -
               There were no known point sources impacting Lowell Lake
          during the sampling year.
                                                                      2
               The present calculated phosphorus loading of C.8";  g P/m /yr
          is greater than that proposed by Vollenweider (1975) as a
          "eutrophic" loading.  Unless the nonpoint phosphorus load can
          be reduced, Lake Lowell can be expected to exhibit progressive
          symptoms of eutr.ophi cation.
     2.   Nonpoint sources -
               All of the phosphorus entering Lake Lowell  apparently came
          from nonpoint sources, primarily agricultural runoff into the
          drainage canals.  New York Canal contributed  91.8% of the total
          phosphorus input into the lake and Unnamed Canal (C-l)  contri-
          buted 6.0%.  A study of land use practices in the  drainage area is
          needed to determine whether any significant reduction of non-
          point phosphorus inputs can be accomplished.

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II.   LAKE AND DRAINAGE BASIN CHARACTERISTICS:
          Lake and drainage basin characteristics  are itemized below.
     Lake surface area, mean depth and volume  were provided by Martin
     and Hanson (1966).  Maximum depth was  estimated on  the basis  of
     National Eutrophication Survey (NES) data.  Tributary flow data
     were provided by the Idaho District Office  of the U.S. Geological
     Survey (USGS).  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 NES  Working Paper
     No. 175.  A table of metric/English conversions is  included in
     Appendix A.
     A.    Lake Morphometry:
          1.   Surface area:  39.80 km .
          2.   Mean depth:  5.9 meters.
          3.   Maximum depth:  12.2 meters.
          4.   Volume:  234.486 x 106 m3.
          5.   Mean hydraulic retention time:   262 days.

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

     1.    Tributaries -

                                        Drainage,      Mean flow
          Name
L/luiiiu^^n      i iwwi i  i i wn
area (km )*    (m^/sec)
          C-l Unnamed Canal               	           0.42
          D-l New York Canal              	           9.74

          Minor tributaries and
          immediate drainage -            	           	
                    Totals                	          10.16

     2.   Outlets -

          A-l Deer Flat Low Line Canal    	           9.74
          B-l Deer Flat at Nampa Canal    	           0.60

                    Totals                	          10.34

C.   Precipitation:

     1.   Year of sampling:  29.4 cm.
     2.   Mean annual:   27.4 cm.
tributaries are canals with no associated drainage areas.

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III.  LAKE WATER QUALITY SUMMARY
          Lake Lowell  was  sampled  three times  during  the  open-water
     season of 1975 by means  of a  pontoon-equipped  Huey helicopter.
     Each time, samples for physical  and chemical parameters were
     collected from three  stations  on the lake and  from a number of
     depths at each station (see map, page v).   During each visit,
     depth-integrated  samples were  collected from each station  for
     chlorophyll  ^analysis and phytoplankton  identification and
     enumeration.   During  the first and last visits.,  18.9-liter
     depth-integrated  samples were  composited  for algal assays.  Maxi-
     mum depths sampled were  4.3 meters at Station  01, 11.0 meters
     at Station 02, and 7.3 meters  at Station  03.   For a  more detailed
     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.

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LA"F LOWELL
STOuET CODE l^Oft
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6
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(MR /I.)
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PHYSICAI AND CHEMICAL CHARACTERISTICS
( S/ 1X75 )
MAX
S*»* = 3 DEPTH
^ANGE
'^sj r^« PANGE MEDIAN IMETEHS)

l.D
11.0

1.5
11.0

6
3

6
3

17.7-
16.3-

7.4-
7.0-

20.7
17.7

15.0
'7.8

18.5
17.5

9.9
7.8

0.0-
4.0-

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RANGE
(METERS)

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TOTAL ALKALINITY
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TOTAL P (MO/L)
O.-l. 5 M DEPTH
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DISSOLVED ORTHQ P
O.-l. 5 M DEPTH
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0,6
                  * N = NO, OF Si
                  ** MAXIMUM DEPTH SAILED AT FACH SITE
                  *»* s = NO. OF STTES SAMPLED ON THIS DATE

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B.   Biological  Characteristics:

     1.    Phytoplankton -
          Sampling
          Date

          04/08/75
          08/01/75
          09/16/75
Dominant
Genera

1.   Fragilaria
2.   Asterionella
3.   Melosira
4.   Stephanodiscus
5.   Synedra

    Other genera

         Total

1.   Apham'zomenon
2.   MeTosira
3.   Fragilaria
4.   Stephanodiscus
5.   Chroomonas

    Other genera

         Total

1.   Melosira
2.   Aphani zomenon
3.   Ankistrodesmus
4.   Cosmarium
5.   Oocystis

    Other genera

         Total
Algal
Units
per ml

 9,120
 5,267
   636
   600
   141

   390

16,154

 59622
   861
   208
   124
    84

   306

 7,205

 5,126
   267
   160
   107
   107

   107

 5,874

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2.   Chlorophyll a. -
     Sampling                 Station             Chlorophyll
     Date                     Number              (yg/1)
     04/08/75                   01                     28.1
                                02               '      26.8
                                03                     25.9

     08/01/75                   01                     28.3
                                02                     25.4
                                03                     20.9

     09/16/75                   01                     39.2
                                02                     17.9
                                03                     16.0

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C.   Limiting Nutrient Study:

     1.    Autoclaved,  filtered,  and nutrient  spiked  -

     a.    04/08/75
          Spike (mg/1)

          Control
          0.05 P
          0.05 P + 1.0  N
          1.00 N

          09/16/75
Ortho P
Cone, (mg/1)

  0.010
  0.060
  0.060
  0.010
          Spike (mg/1)

          Control
          0.05 P
          0.05 P  + 1.0  N
          1.00 N
Ortho P
Cone, (mq/1)

  0.020
  0.070
  0.070
  0.020
Inorganic N
Cone, (mg/1)

  0.072
  0.072
  1.072
  1.072
Inorganic N
Cone, (mg/1)

  0.425
  0.425
  1.425
  1.425
Maximum Yield
(mg/1-dry wt.)

     0.4
     2.3
     7.8
     0.4
Maximum Yield
(mg/1-dry wt.)

     1.0
    14.6
    18.6
     1.0

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                                  10
2.   Discussion -
          The control  yields  of the assay  alga,  Selenastrum  capri-
     cornutum, indicate that  the potential  for primary  production in
     Lake Lowell  was moderate at the times  of  assay  sample collection
     (04/08/75; 09/16/75).   In both assays,  addition of phosphorus
     alone and in combination with nitrogen  caused a significant
     increase in  yield over that of the  control,  indicating  phosphorus
     limitation.   The addition of nitrogen  alone  did not result in an
     increase over that of  the control.  However, it should  be noted
     that there were substantial  changes in  nutrient levels  between
     the collection and assay of the water  samples.   Therefore, the
     assay may not accurately reflect the  nutrient limitation situation
     in the lake  at the time  of collection.
          The mean inorganic  nitrogen to orthophosphorus (N/P) ratios
     in the lake  data were  3/1, 4/1, and 20/1  in  the spring, summer,
     and fall  respectively, suggesting nitrogen  limitation in the spring
     and summer and phosphorus limitation  in the  fall (a mean N/P ratio
     of 14/1  or greater generally reflects  phosphorus limitation).

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                                 n
IV.   NUTRIENT LOADINGS
     (See Appendix D for data)
          For the determination  of nutrient  loadings,  the  Idaho National
     Guard collected monthly  near-surface  grab samples from each of the
     tributary sites indicated on  the map  (page  v), except for the high
     runoff months of June  and July when two samples were collected.  Samp-
     ling was begun in  October 1974, and was completed in September 1975.
          Through an interagency agreement,  stream flow estimates for the
     year of sampling and a "normalized" or  average year were provided by
     the Idaho District Office 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 tributaries
     are those measured minus known point  source loads, if any.

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                                  12
A.   Waste Sources:
     1.   Known municipal - None
     2.   Known industrial - None
B.   Annual Total Phosphorus Loading - Average Year:
     1.   Inputs -
                                                            % of
          Source                             kg P/yr        total
          a.   Tributaries (nonpoint load) -
               C-l Unnamed Canal              1,925          6.0
               D-l New York Canal            29,470         91.8
          b.   Minor tributaries and immediate
               drainage (nonpoint load) -     	         	
          c.   Known municipal STP's - None
          d.   Septic tanks* -                   10         <0.1
          e.   Known industrial - None
          f.   Direct precipitation** -         695          2.2
                              Totals         32,100        100.0%
     2.   Outputs -
          A-l Deer Flat Low Line Canal       15,780
          B-l Deer Flat Nampa Canal           2,415
                              Totals         18,195
     3.   Net annual P accumulation -        13,905
    *Estimate based on 32 lakeshore residences.
   **Estimated (See NES Working Paper No.  175).

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                                  13
C.   Annual Total Nitrogen Loading - Average Year:

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

          a.   Tributaries (nonpoint load) -

               C-l Unnamed Canal              42,530         15.1
               D-l New York Canal            196,660         69.6

          b.   Minor tributaries and immediate
               drainage (nonpoint load) -     	         	
          c.   Known municipal STP's - None

          d.   Septic tanks* -                   340         0.1

          e.   Known industrial - None

          f.   Direct precipitation** -       42.970        15.2

                              Totals         282,500       100.0%

     2.   Outputs -

          A-l Deer Flat Low Line Canal       275,170
          B-l Deer Flat Nampa Canal           29,330

                              Totals         304,500

     3.   Net annual N export*** -            22,000
    *Estimate based on 32 lakeshore residences.
   **Estimated (See NES Working Paper No. 175).
  ***Export probably due to unknown sources and/or sampling error.

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                                  14
D.   Mean Nutrient Concentrations in Ungaged Streams:
                                        Mean Total P   Mean Total
     Tributary                             (mg/1)         (mg/1)
     E-l Unnamed Canal                     <0.083         1.806

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                                  15
E.    Yearly Loadings:
          In the following table, the existing phosphorus 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 be applicable to water
     bodies with very  short retention times or in which light penetration
     is severely restricted from high concentrations of suspended solids
     in the surface waters.
                             Total  Yearly
                          Phosphorus Loading
                               (g/m?/yr)
     Estimated loading for Lake Lowell                           0.81
     Vollenweider's "eutrophic" loading                          0.56
     Vollenwieder's "oligotrophic" loading                       0.28

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                                  16
V.   LITERATURE

     Martin, R.O.R.  and Ronald L.  Hanson.   1966.   Reservoirs in the U.S.
       Geological Survey Water Supply, Paper No.  1838.   U.S. Government
       Printing Office, Washington, D.C.

     U.S. Environmental Protection Agency.   1965.   National  Eutrophica-
       tion 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. Hydro!.  37:53-84.

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                                 17





VI.  APPENDICES
                          APPENDIX  A



                      CONVERSION FACTORS

-------
                CONVERSION FACTORS





Hectares x 2.471 = acres



Kilometers x 0.6214 = miles



Meters x 3.281 = feet



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 B



TRIBUTARY FLOW DATA

-------
                                   TRI3UTA&Y FLOW  INFORMATION FOR  IDAHO

LAKE CODE 1608     LAKE LOWELL

     TOTAL DRAINAGE AREA OF LAKF
                                                                           OP./23/76
                                              n.o
          SUB-DRAINAGE
TRIBUTARY  AREAtSG KM)
                                                 NORMALIZED FLOWS(CMS)
1 ft 0 * 4 1
1608C1
160P01
160977
0.0
0.0
n.o
o.o
JAN
"I. 11 3
0.0
0.0
4.67
0.0
FEB
0.057
0.0
0.0
10.36
0.0
MAP
0 . 5 6 6
0.0
0.0
7.05
0.0
APR
i 0 . 5 0 6
0.31 1
0.283
17.81
0.0
MAY
18.916
1.21P
0.765
16.79
0.0
JUN
21.7*7
1.303
0.963
17.33
0.0
JUL AUG
25.117 22.087 1
1.812 1.586
1.189 1.189
9.29 8.21
0.0 0.0
S.EP
2.205
0.765
0.566
14.72
0.0
OCT
4.36!
0.085
0.085
6.88
0.0
NOV
0.255
0.0
0.0
0.74
0.0
DEC
0*142
0.0
0.0
3.45
0.0
MEAN
0^595
0.423
9.74
n.o
SUMMARr
TOTAL
SUM OF
DRAINAGE AREA OF LAKE =
SUB-DRAINAGE AREAS =
0.
n.
0
0
TOTAL FLOW
TOTAL FLOW
IN =
OUT =
0.0
245.51



     MEAN MONTHLY FLOWS AND DAILY FLOWS
TRIBUTARY
1608A1
            MONTH
                    YE AD
                            MEAN FLOW  DAY
                                    FLOW  DAY
                                                                     FLOW  DAY
                                                                                       FLO»
1608B1
10
11
12
1
2
3
4
5
^
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
74
74
74
75
75
75
75
75
75
75
75
75
74
74
74
75
75
75
75
75
75
75
75
75
0.0
0.0
0.0
0.0
0.0
0.0
3.964
19.086
21.80*
26.590
22.399
15.801
0.0
0.0
0.0
0.0
0.0
0.0
0.051
0.521
1.056
1.382
1.017
0.674
2P
17
14
19
16
16
19
16
6
11
17
14
20
17
14
19
16
If
10
16
6
11
17
14
0.0
0.0
0.0
0.0
0.0
0.0
6.796
22.880
22.512 27
28.175 27
25.344
16.367
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.821
1.076 27
1.472 25
1.331
0.765








16.367
24.636










0.793
1 . 246



-------
                                   TRIBUTARY FLOW INFORMATION FOR IDAHO                    08/33/76

LAKE CODE 1608     LAKE LOWFLL                                                    .

     MEAN MONTHLY FLOWS AND DAILY FLOWS(CMS)

TRIBUTARY   MONTH   YEAR    MEAN FLOW  DAY         FLOW  DAY         FLOW  DAY          FLOW

1608C1       10      74
             11      74
             12      74
              1      75
              2      75
              3      75
              4      75
              5      75
              6      75
              7      75         1.366   11        1.642   12         1.784   25         1.0*8
              8      75
              9      75
1608D1       10      74
             11      74
             12      74
              1      75
              2      75
              3      75
              4      75
              5      75
              6      75
              7      75
              8      75
              9      75
0.088
0.0
0.0
0.0
0.0
0.0
0.088
0.660
1.110
1.266
1.119
0.660
17.273
10.336
0.0
0.0
3.341
13.960
15.263
16.254
18.349
11.497
8.523
12.799
20
17
14
19
16
16
19
16
6
11
17
14
20
17
14
10
16
16
19
16
6
11
17
14
0.0
0.0
0.0
0.0
0.0
0.0
0.0
1.133
0.991 27
1.642 12
1.076
0.311
0.0
29.308
0.0
0.0
0.0
27.467
28.600
18.944
20.388 27
7.249 25
8.184
7.759








1.104
1.784










20.303
11.412



-------
        APPENDIX C



PHYSICAL AND CHEMICAL DATA

-------
STORET RETRIEVAL DATE
N'ATL EUTROPHICATIO^ SURVEV
EPA-LAS VEGAS
 160801
43 32 01.0 116 37 23.0  3
LAKE LOWELL
16027   IDAHO
                                                                                           130791
11EPALES 211
0018 FEET DEPTH CLASS

DATE
FPQM
TO
75/04/08



75/08/01


75/09/16



DATE
FROM
TO
75/04/OR



75/08/01


75/09/16




TIME DEPTH
OF
DAY
10
10
10
10
18
18
IB
14
14
14


FEET
35 0000
35 0005
35 0010
35 0014
15 0000
15 0005
15 0013
15 0000
15 0005
15 0010

TIME DEPTH
OF
DAY
10
10
10
10
18
18
18
14
14
14

FEET
35 0000
35 0005
35 0010
35 0014
15 0000
15 0005
15 0013
15 0000
15 0005
15 0010
00010
•WATER
TEMP
CENT
4.6
4.6
4.5
4.6
20.7
18.5
17.7
17.8
17.1
16.8
00665
PHOS-TOT

MG/L P
0.041
0.044
0.047
0.049
0.174
0.072
0.058
0.080
0.081
0.073
00300
DO

MG/L
11.
13.
13.
12.
15.
8.
7.
9.
6.
7.
32217




0
0
0
8
0
2
8
0
2
2

CHLRPHYL
A
UG/L
28.



28.


39.




1



3


2


00077 00094
TRANSP CNDUCTVY
CECCHI FIELD
INCHES MICROMHO
42 151
150
150
151
4 203
203
195
24 301
301
345
00031
IMCDT LT
REMNING
PERCENT










00400
PH

SLl
8.80
8.80
8.80
8.80
9.60
9.40
9.35
8.70
8.70
&.80














00410
T ALK
CAC03
MG/L
88
87
89
88
82
85
86
108
111
121














00610
NH3-N
TOTAL
MG/L
0.030
0.030
0.030
O.Q30
0.040
0.040
0.070
0.030
0.080
0.040














1202
OC

00625
TOT
N
KJEL

MG/L
0
0
0
0
1
0
0
0
0
0














.600
.600
.600
.500
.500
.800
.600
.500
.600
.500














                                                                                                        00630      00671
                                                                                                     N02&N03    PHOS-DIS
                                                                                                     N-TOTAL     ORTHO
                                                                                                        MG/L
                                                                                                         0.030
                                                                                                         0.020K
                                                                                                         0.020K
                                                                                                         0.040
                                                                                                         0.020K
                                                                                                         0.020K
                                                                                                         0.020
                                                                                                         0.180
                                                                                                         0.200
                                                                                                         0.400
                                                 0.025
                                                 0.027
                                                 0.015
                                                 0.030
                                                 0.020
                                                 0.026
                                                 0.0.19
                                                 0.011
                                                 0.008
                                                 0.009
      K VALUE KNOWN TO BE LESS
           THAN INDICATED

-------
STO°ET RETRIEVAL OflTB  76/nq/>5
NATL EUTROPHICATIOH  SURVEY
EPA-LAS VEGAS
DATE
FROM
 TO
         TIME DEPTH
          OF
         DAY  FEET
75/04/0* 11 00 0000
         11 00 0005
         11 00 0015
         11 00 0036
75/08/01 18 45 0000
         18 45 0005
         18 45 0015
         18 45 0033
75/09/16 14 40 0000
         14 40 0005
         14 40 0015
         14 40 0026
                       onoio
                       TEMP
                       CENT
                          4.7
                          4.7
                          4.6
                         18.5
                         17.7
                         17.5
                         16.3
                         19.9
                         18.3
                         15.9
                         15.3
                                                                   16-0802
                                                                  43 33 22..0 116 39 22.0 3
                                                                  LAKE LOWELL
                                                                  16027   IDAHO
                                                                                            130791
11EPALES
211
C040 FEET DEPTH CLASS
00300
DO

MG/L
13.0
12.6
12.6
12.4
12.2
8.0
7.8
7.0
10.4
8.8
0.4
7.4
00077
TRANSP
<=ECCHI
INCHES
36



22



24



00094
CNOUCTVY
FIELD
MICHOMHO
152
152
152
152
200
200
197
208
286
281
307
302
00400
PH

Stl
8.90
8.90
8.80
8.80
9.45
9.40
9.30
9.20
9.25
9.15
8.10
9.20
00410
T ALK
C«C03
MG/L
87
86
85
85
87
89
90
91
103
106
125
130
00610
NH3-N
TOTAL
MG/L
0.030
0.040
0.040
0.050
0.030
0..050
0,060
0.130
0.040
0.060
0.520
0.060
1202
on
00625
TOT KJFCL
N
MG/L
0.600
0.500
0.500
0.600
1.300
0.800
0.500
0.700
O.«00
0.600
0.900
0.800
  00630     00671
N02&N03   PHOS-OIS
M-TOTAL    OPTHO
  MG/L     MG/L °
                                                                                                       0.020
                                                                                                       0.020K
                                                                                                       0.020K
                                                                                                       0.0.20K
                                                                                                       0..020
                                                                                                       0.020
                                                                                                       0.030
                                                                                                       0.040
                                                                                                       0.100
                                                                                                       0.100
                                                                                                       O.?60
                                                                                                       0.100
             0.02?
             0.006
             0.022
             0.019
             0.010
             0.012
             0.016
             0.021
             0.009
             0.010
             0.031
             0.010
  DATE    TIME DEPTH
  FROM     OF
    TO     DAY  FEET

 75/04/08 11  00 0000
          11  00 0005
          11  00 0015
          11  00 0036
 75/08/01 18  45 0000
          18  45 0005
          18  45 0015
          18  45 0033
 75/09/16 14  40 0000
          14  40 0005
          14  40 0015
          14  40 0026
'0665
iS-TOT

i/L P
0.048
0.050
0.063
0.279
0.127
0.068
0.049
0.083
0.084
0.065
0.095
0.096
32217
CHLRPHYL
A
UG/L
26.8



25.4



17.9



00031
INCOT LT
PFMNING
PERCENT












          R VALUE KNOWN TO BE LESS
               THAN INDICATED

-------
       PETPjEv/iL OATE
NATL
EPA-LAS VEGAS
 160803
43 35 03.0 116 43  40.0  3
LAKE LOWELL
16027   IDAHO
                                                                                            1307Q1
                                                                  11EPALES              2111202
                                                                   0027 FEET  DEPTH   CLASS 00
DATE
F30W
TO
75/04/08



75/08/01


75/09/16



DATE
FROM
TO
75/04/08



75/08/01


75/09/16


TIME
OF
DEPTH
DAY FEET
11 25
11 25
11 25
11 25
19 20
19 20
19 20
15 05
15 05
15 05

TIME
OF
DAY
11 25
11 25
11 25
11 25
19 20
19 20
19 20
15 05
15 05
15 05
0000
"005
0015
0024
0000
0005
0016
0000
0005
0011

DEPTH

FEET
0000
0005
0015
0024
0000
0005
0016
0000
0005
0011
00010
WATE3
TEMP
CENT
4.6
4.6
4.5
4.5
18.7
17.9
17.5
20.7
19.3
17.4
00665
PHOS-TOT

MG/L P
0.059
0.055
0.053
0.049
0.088
0.073
0.053
0.074
0.096
0.084
00300
DO
MG/L
13.
13.
12.
13.
11.
7.
7.
9.
8.
9.
32217
00077 00094
TRANSP CNDUCTVY
<;ECCHT FIELD
INCHES MICPOMHO
0 18
0
8
0
6 24
4
8
8 12
1
5
00031
157
157
156
155
197
199
204
258
247
241

00400 00410
PH T ALK
CAC03
Stl
8
8
8
P
9
9
8
9
9
9


.90
.90
.85
.90
.65
.00
.70
.10
.15
.30

MG/L
90
90
91
90
87
92
90
103
96
97

00610 00625
NH3-N TOT KJEL
TOTAL N
MG/L
0.050
0.030
0.040
0.040
0.040
0.070
0.120
0.070
0.030
0.040

MG/L
0.400
0.400
0.600
o.soo
0.700
0.700
0.600
0.700
0.800
0.800

CHLRPHYL INCDT LT
A
UG/L
25.



20.


16.


PFMNING
PERCENT
9



9


0










































































                                                                                                        00630      00671
                                                                                                      N02S.N03    PHOS-DIS
                                                                                                      N-TOTAL     ORTnO
                                                                                                        MG/L      MG/L P
                                                                                                         0.020
                                                                                                         0.020*
                                                                                                         0.020K
                                                                                                         0.020K
                                                                                                         0.020K
                                                                                                         0.020
                                                                                                         0.030
                                                                                                         0.100
                                                                                                         0.020K
                                                                                                         0.020K
                                                  0.010
                                                  0.016
                                                  0.011
                                                  0.033
                                                  0.033
                                                  0.033
                                                  0.012
                                                  0.013
                                                  0.011
                                                  0.013
       K VALUE KNOWN TO BE LESS
           THAN INDICATED

-------
       APPENDIX D

TRIBUTARY AND WASTEWATER
  TREATMENT PLANT DATA

-------
STORET RETRIEVAL DATE 76/08/25
MATt F.UTROPHICATION SURVEY
EPA- LAS VEGAS
 1608A1
43 35 22.0 lift 44 42.0 4
DEER FLT LOW LINE CANAL
16      7.5 LAKE LOWELL
0/LAKE LOWELL            1307Q1
HOOOLEY 90 RRDG 1.6 MI Sw OF HWY 55
11EPALES             2111304
 0000 FEET  DEPTH  CLASS 00

DATE
FROM
TO
75/35/16
75/06/06
75/06/27
75/07/11
75/07/27
75/08/17
75/09/14

TIME DEPTH
OF
OAY FEET
16 00
16 30
16 05
15 05
15 30
15 37
15 42
00630
NO?(sN03
N-TOTAL
MG/L
0.005
3.600
0.105
0.195
0.105
0.155
0.230
006?5
TOT KJEL
N
MG/L
0.700
0.550
0.650
0.400
0.150
0.200
0.400
00610
NH3-N
TOTAL
MG/L
0.020
0.050
0.025
0.017
0.035
0.010
0.010
00671
PHOS-OIS
ORTHO
MG/L P
0.015
0.050
0.025
0.075
0.035
0.035
0.060
00665
PHOS-TOT

MG/L P
0.050
0.060
0.030
0.100
0.050
0.060
0.070

-------
STCPET RETRIEVAL 0-ATE .7e/op/?5
NATL EUTROPHICATION SURVEY
EPA- LAS VEGA?
  DATE   TIME PERT* N02S.N03
  FROM    OF
   TO    DAY  FEET

75/05/16 16 35
75/06/06 16 00
75/06/27 16 35
75/07/11 16 10
75/07/25 16 10
75/08/17 15 05
75/09/14 13 05
 1608B1
43 33 40.0 116 38 52.0 4
DEER FLT AT NAMPA CANAL
16      7.5 LAKE LOWELL
0/LAKE LOWELL             1307Q1
LK LOWELL AVE 5.2 MI SE OF QFaTH  CORNER
11EPALES             2111204
 0000 FEET  DEPTH  CLASS  00
0630
S.N03
OTAL
G/L
0.005
3.700
0.110
0.3RO
0.105
0.155
0.440
00635
TOT KJEL
N
MG/L
0.450
0.400
0.350
0.600
0.200
0.200
0.400
00610
MH3-N
TOTAL
MG/L
0.015
0.060
0.010
0.030
0.025
0.010
0.010
00671
PHOS-DIS
ORTHO
MG/L P
0.010
0.045
0.030
0.110
0.035
0.035
0.120
00665
PHOS-TOT

MG/L P
0.030
0.060
0.030
0.170
0.050
0.060
0.150

-------
STQPET RETRIEVAL DATE 76/08/25
NATL FUTPOPHICATION ?URVEY
EPA- |_AS VEGAS
 1608C1
43 31 27.0  116  38 04.0 4
UNNAMED CANAL
16      7.5  LAKE LO*ELL
T/LAKE LOWELL             1307Q1
LK SHORE DPV EtRDG 4 MI SE OF LKVIEw  SCK
11EPALES              2111204
 0000 FEET   DEPTH  CLASS 00

DATE
FRQM
TO
74/10/20
75/04/19
7?/05/16
75/06/06
75/06/27
75/07/11
75/07/12
75/07/25
75/08/17
75/09/14

TIME DEPTH
OF
DAY FEET
14 10
n9 45
14 30
14 30
15 10
13 55
14 00
14 32
14 05
14 52
00*30
00625
N02sN03 TOT KJEL
N-TOTAL
MG/L
0.008
0.360
0.140
0.390
0.250
3.450
4.000
0.145
3.300
0.230
N
MG/L
0.200
1.250
0.600
0.500
0.400
0.500
1 .300
0.250
0.550
0.300
00610
NH3-M
TOTAL
MG/L
0.015
0.035
0.015
0.025
0.005K
0.095
0.135
0.015
0.075
0.015
00671
PHOS-DIS
ORTHO
VG/L P
0.005
0.015
0.035
0.060
0.045
0.070
0.010
0.025
0.060
0.065
00665
PHOS-TOT

MG/L P
0.010
0.030
0.100
0.100
0.080
0.075
0.030
0.040
0.080
0.070
     K VALUE KNOWN TO BE  LESS
         THAN INDICATED

-------
STOPET RETRIEVAL  DATE  76/0«/25
MATl. FUTPQPHICATIO*  SURVF.V
EPA- LAS VEGAS
 160001
43 30 36.0  116  34  44.0 4
NEb YORK CANAL
16      7.5  NAMPA
T/LAKE LOWELL
LK SHORE DRV BRDG  .3 MI
11EPALES
 0000 FEET   DEPTH
                                                                                              130791
                                                                                            K  OF  H»Y 45
                                                                                         2111204
                                                                                       CLASS  00
DATE
TO
74/10/20
74/11/17
75/03/16
75/04/19
75/05/16
75/06/06
75/06/27
75/07/11
75/07/25
75/08/17
75/09/14
00630 00625
TIME DEPTH N02S.N03 TOT KjEL
OF N-TOTAL N
DAY FF.ET
13
14
09
08
13
14
13
13
13
13
12
10
00
30
45
35
05
35
05
20
15
35
MG/L
1.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
160
192
105
170
170
130
110
360
105
170
250
MG/L
0.
0.
0.
0.
1.
0.
0.
0.
0.
0.
0.
500
200
250
600
750
300
350
700
250
250
300
00610 00671 00665
NN3-N PHOS-DIS PHOS-TOT
TOTAL ORTHQ
MG/L
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
020
025
015
020
025
030
010
035
020
020
010
MG/L
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
P
025
015
005K
010
055
036
035
110
045
050
065
MG/L P
0.025
0.030
0.020
0.040
0.140
0.070
0.070
0.190
0.080
0.060
0.070
     K VALUE KNOWN TO BE LESS
         THAN INDICATED

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       RETOIEVAL DATE 76/0»/25
NATL FUTROPnlCATIO* SURVEY
EPA- LAS VEGAS
DATE
FROM
TO
74/10/20
74/11/17
75/03/16
75/04/19
75/05/16
75/06/06-
75/06/27
75/07/11
75/07/25
75/08/17
75/09/14
TIME
OF
HAV
13
13
09
09
13
13
13
13
13
12
12


40
1^
10
05
15
45
20
30
10
55
£0
              FEET
 160RD2
43 30 33.0 116 34 35.0 4
NEw YORK CANAL
16      7.5 NAMPA
T/L&«E LOHFLL            130791
RNK FRM DRT «D 3.2 MI S OF NAMPA
11EPALES             3111204
 0000 FEET  DEPTH  CLASS 00
0630

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STO"ET RETRIEVAL  DATE 76/08/25
MATL FUTP.OPHICATION  SURVEY
EPA- LAS VEGAS
 1608E1
43 34 02.0  116  44 30.0 4
UNNAMED CANAL
16      7.5  LAKE LOWELL
T/LAKE LOWELL              1307Q1
BNK FRM LKSHORE DR 3.5 MI NW  LKVIFw SCHL
11EPALES              ?111?04
 0000 FEET   DEPTH  CLASS  00

DATE
FROM
TO
74/10/20
75/04/19
75/05/16
75/06/06
75/06/27
75/07/11
75/07/25
75/08/17
75/09/14


00630
TIME DEPTH N02iiN03
OF
DAY
14
10
15
15
14
14
14
14
14

FEET
45
15
15
10
20
23
57
45
3"
N-TOTAL
MG/L
0.024
0.175
0.155
0.115
3.300
0.525
3.300
0.060
3.300
00625
TOT KJEL
N
MG/L
0.400
0.650
1.050
0.200
0.900
0.500
O.SOO
0.250
0.850
00610
NH3-N
TOTAL
MG/L
0.025
0.010
0.017
0.015
0.075
0.020
0.0<50
0.025
0.075
00671
PhOS-DIS
ORTHO
MG/L P
0.005
0.035
0.008
0.031
0.065
0.115
0.070
0.055
0.090
00665
PHOS-TOT

MG/L P
0.010
-0.170
OoOlOK
0.060
0.080
0.170
0.070
0.090
0.090
   K VALUE KNOWN TO BE LESS
        THAN INDICATED

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                            APPENDIX E

                   PARAMETRIC RANKINGS OF LAKES
                      SAMPLED BY NES IN 1975

                          STATE OF IDAHO
     Mean or median values for six of the key parameters  evaluated
in establishing the trophic conditions of Idaho lakes sampled  are
presented to allow direct comparison of the ranking9  by parameter,
of each lake relative to the others.  Median total  phosphorus,, median
inorganic nitrogen and median dissolved orthophosphorus levels are
expressed in mg/1. Chlorophyll a_ values are expressed in  yg/1.
To maintain consistent rank order with the preceding  parameters,
the mean Secchi disc depth9 in inches, is subtracted  from 500.
Similarlys minimum dissolved oxygen values are subtracted from 15
to create table entries.

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LAKE DATA TO BE USED IN RANKINGS

LAKE
CODE  LAKE NAME

1601  AMERICAN FALLS RESERVOIR

1602  CASCADE LAKE

1603  LAKE COEUR D'ALENE

1604  DWORSHAK RESERVOIR

1605  HAUSER

1606  HAYDEN LAKE

1607  ISLAND PARK RESERVOIR

1608  LAKE LOWELL

1609  MAGIC RESERVOIR

1610  PALISADES RESERVOIR

1611  LOtfER PAYETTE

1612  LOWER TWIN LAKES

1613  UPPER TWIN LAKES
MEDIAN
TOTAL P
0*105
Oc032
©00I7
o.oie
©0028
OoOIg
0o©34
"Os ©7©
Oo062
0o©24
©9013
©o©U
©0017
MEDIAN 500~
INORG N MEAN SEC
Oe©80 463.800
0«060 415.067
Oc©40 3800348
60680 4010866
00075 366028G
0e©4© 243.500
00©50 391.778
©8o7e «77 ,m
0ol30 400o750
00©8© 34S0428
0e©6© 234e0@©
0o©5@ 37©o0@©
00©45 369oi^3
MEAN
CHLORA
15.379
8.081
16.391
2.420 .
lloliS
2«787
9»322
250389
7o322
2.067
4o6@§
2o3J8
4.986
15-
MIN 00
14.700
14.800
12.200
7.400
14o800 '
1U800
12.800
14.600
14.700
12^800
9o60©
13o600
8o200
MEDI;
OISS ORTI
0.035
0.009
@o005
0*009
000i3
0e003
©eoi2
00015
0c020
0.007
©0©07
0.009
Oe>004

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PERCENT OF LAKES WITH HIGHER VALUES (DUMBER OF  LAKES  WITH  HIGHER  VALUES)
LAKE
CODE  LAKE NAME
1601  AMERICAN FALLS RESERVOIR
1602  CASCADE LAKE
1603  LAKE COEUR D'ALENE
1604  OwfOWSHAK RESERVOIR
1605  MAUSER
16©fc  NAYDEN LAKE
1607  ISLAND PARK RESERVOIR
1608  LAKE LOWELL
1609  MAGIC RESERVOIR
161©  PALISADES RESERVOIR
1611  LOWER PAYETTE
1612  LOWER TOIN LAKES
1613  UPPER TWIN LAKES
MEDIAN
TOTAL P
e c
33 C
67 i
96 C
42 (
96' i
25 1
8 (
17 C
50 (
83 <
75 C
58 (
0)
4)
8>
11)
S)
111
3)
1»
2)
6*
10)
9)
7)
MEDIAN 500- MEAN 15-
INORG H MEAN SEC CHLORA MIN DO
17 <
54 <
96 «
17 .<
33 C
96 C
71 C
42 «
0 «
17 t
54 (
71 (
83 <
1)
6)
11)
1>
4)
11)
8)
5>
©)
1).
&)
m .
i©)
8 (' 1) . 8 ( 1> 21 ( 2)
17 C 2) 4g « 5) 4 ( 0)
SQ « 6) 25 C 3) 67 ( 8)
25 ( 3) 83 ( 10) 106 C 1%)
75 C 9) 17 ( 2» . 4 { 6)
92 ( 111 15 t 91' . 7S C 9)
42 C SS 33 < 41 54 C 6>
0 C ©S © ( @J 33 C 4)
33 < 4) S© 46) 21 4 2*
83 C 10) ' !©@ ( 12J> 54 « 6S
10a < 12> 67 C 8) S3 < 10)
SB C 7J 92 C IU 42 i S)
67 (8) 58 C 71 9g 1 li>
MEDIAN
PISS ORTHO
0
SO
83
50
25
100
33
17
8
75
67
SO
92
( 0)
( 5)
( 10)
C 5)
i 3)
C 12)
( 4)
{ 2)
< 1)
( 9)
4 §)
( 5)
C il>

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