U.S. ENVIRONMENTAL PROTECTION AGENCY
           NATIONAL EUTROPHICATION SURVEY
                    WORKING PAPER SERIES
                                           REPORT
                                            ON
                                       MAGIC RESERVOIR
                                    CAPIAS AND ELAINE COIMTIES
                                           IDAHO
                                        EPA REGION X
                                     WORKING PAPER No, 782
 CORVALLIS ENVIRONMENTAL RESEARCH LABORATORY - CORVALLIS, OREGON
                             and
ENVIRONMENTAL MONITORING & SUPPORT LABORATORY - LAS VEGAS, NEVADA

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                                 REPORT
                                   ON
                             MAGIC RESERVOIR
                        CAMAS AND ELAINE COUNTIES
                                  IDAHO
                              EPA REGION X
                          WORKING PAPER No,  782
     WITH THE COOPERATION OF THE
IDAHO DEPARTMENT OF HEALTH AND WELFARE
                AND THE
         IDAHO NATIONAL GUARD
              JULY, 1977

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          REPORT ON MAGIC RESERVOIR

      CAMAS AND BLAINE COUNTIES, IDAHO

                EPA REGION X


                     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.  782
     OFFICE OF RESEARCH AND DEVELOPMENT
    U.S. ENVIRONMENTAL PROTECTION AGENCY

                  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             5
III. Lake Water Quality Summary                          7
 IV. Nutrient Loadings                                  13
  V. Literature Reviewed                                20
 VI. Appendices                                         21

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                                  ii


                               FOREWORD
     The National EutropMcatlon Survey was Initiated  1n  1972  1n
response to an Administration commitment to Investigate the nation-
wide threat of accelerated eutrophlcation 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 nonpolnt source pollution abatement 1n lake water-
sheds.

ANALYTIC APPROACH

     The mathematical and statistical  procedures selected for  the
Survey's eutrophlcation 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 eutrophlcation 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
L§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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                                  m
     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 forivjlation 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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                                 IV
                    NATIONAL EUTROPHICATION SURVEY
                              STUDY LAKES
                            STATE OF IDAHO
LAKE NAME
American Falls Reservoir
Cascade Reservoir
Coeur d'Alene Lake
Dworshak Reservoir
Mauser Lake
Hayden Lake
Island Park Reservoir
Lake Lowell (Deer Flat Reservoir)
Magic Reservoir
Palisades Reservoir
Payette Lake
Lower Twin Lake
Upper Twin Lake
    COUNTY
Bannock, Bingham, Power
Valley
Benewah, Kootenai
Clearwater
Kootenai
Kootenai
Fremont
Canyon
Blaine, Camas
Bonneville (Lincoln in WY)
Valley
Kootenai
Kootenai

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     Sew.ui'' Treatment  Facility
Oj)   IrilxiUry  Sampling Site
X   I -iko 'Mimpl ing Si tc

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                  REPORT  ON  MAGIC  RESERVOIR,  IDAHO
                           STORE!  NO.  1609

I.    CONCLUSIONS
     A.    Trophic Condition:*
               Survey data indicate that Magic  Reservoir  is  eutrophic,
          i.e., nutrient  rich and  highly productive.   Whether  such
          nutrient enrichment is to be considered  beneficial or  dele-
          terious is determined by its actual or potential  impact
          upon designated beneficial  water  uses of  each lake.
               Chlorophyll a_ values in the  lake ranged from  1.3  yg/1
          in May to 27.3  yg/1 in September  with a mean of 7.3  yg/1.
          Potentials for  primary production as  measured by algal assay
          control yields  were high.  Lake water transparency was gen-
          erally good in  the summer and fall, but  low during spring
          sampling.  Of the 15 Idaho lakes  sampled  in 1975,  only 2  had
          higher median total phosphorus (0.062 mg/1), none  had  higher
          median inorganic nitrogen (0.130  mg/1),  and 1 had  higher
          median orthophosphorus  (0.020 mg/1) levels  than Magic  Reser-
          voir.
               Survey limnologists did not  report  any problem  algal
          blooms or macrophytes during their visits to the lake.  How-
          ever, other studies (C.  Falter, 1973) have  reported  bloom

          *See Appendix E.

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     conditions in midsummer of several  dominant species in the lake,
     and recommended restriction of nutrient supplies, particularly
     nitrates, to curtail  future summer  algal  growths.
B.    Rate-Limiting Nutrient:
          The algal assay results indicate that Magic Reservoir was
     limited by available phosphorus during spring sampling (05/15/75)
     and by available nitrogen during the fall  (09/17/75).   The
     reservoir data suggest nitrogen limitation at all three sampling
     times.
C.    Nutrient Controllability:
     1.    Point sources -
               During the sampling year, the listed point sources were
          calculated to contribute 21.5% of the total phosphorus load
          to Magic Reservoir.   The wastewater treatment plant at
          Ketchum contributed 15.2%, and two other facilities at Hailey
          and Mountain Meadows Mobile Home Park contributed 5.1% and
          1.2%, respectively.   However,  actual  annual contributions to
          Magic Reservoir from these plants are somewhat less than the
          calculated values as during May to October much of the Big
          Wood River is diverted for irrigation at Bellevue.  Further
          investigation is needed to determine  what percent of the
          loadings from the municipal  plants discharging to Big Wood
          River actually reach Magic Reservoir.

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                                                      2
          The present phosphorus loading of 2.58 g P/m /yr is twice
     that proposed by Vollenweider (1975) as a "eutrophic" loading.
     The loading data suggest that 90% reduction of contributions from
     the known point sources would still leave high nutrient inputs,
     and further reduction in nutrient contributions, including non-
     point, would probably be necessary to effect lake water quality
     improvement.  Examination of land use practices and identification
     of additional point sources may provide answers to further nutrient
     reductions.
2.   Nonpoint sources -
          Nonpoint sources, including precipitation, contributed 78.5%
     of the total phosphorus input during the sampling year.   The Big
     Wood River contributed 22.8%, Camas Creek contributed 45.0% and
     the ungaged minor tributaries and immediate drainage contributed
     an estimated 4.8%.
          The nutrient export rates of Poison Creek were substantially
     greater during the sampling year than the other gaged tributaries
     to Magic Reservoir (Section IV-D).  These inflated rates may be
     due to unidentified point sources rather than to nonpoint source
     inputs, but more extensive sampling would have to be done to
     determine the location and significance of these possible sources.

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II.   LAKE AND DRAINAGE BASIN CHARACTERISTICS
          Lake and drainage basin  characteristics  are  itemized  below.
     Lake morphometry data were provided  by Martin and Hansen  (1966)
     and U.S. Geological  Survey (USGS)  Water  Quality Records  (1972).
     Tributary flow data  were provided  by the Idaho District Office
     of the 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 es-
     timated by methods as outlined in  National  Eutrophication  Survey
     (NES) Working Paper  No. 175.   A table of metric/English conver-
     sions is included as Appendix A.
     A.    Lake Morphometry:
          1.    Surface area:   15.80
          2.    Mean depth:   15.0 meters.
          3.    Maximum depth:   ?
          4.    Volume:  236.213 x 106  m3.
          5.    Mean hydraulic  retention  time:   175  days.

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

1.    Tributaries -

                                   Drainage       Mean flow
     Name                          area(km?)       (m3/sec)

     A-2 Big Wood River              2,147.1          9.29
     C-l Camas Creek                 1,678.3          5.29
     D-l Poison Creek                   18.7          0.04
     E-l Rock Creek                    105.7          0.32

     Minor tributaries and
     immediate drainage -              178.4          0.48

               Totals                4,128.2         15.42

2.    Outlet - A-l Big Wood River     4,144.0         15.66

Precipitation:

1.    Year of sampling:  30.2 cm.
2.    Mean annual:  24.1 cm.

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III.  LAKE WATER QUALITY SUMMARY
          Magic Reservoir was  sampled  three  times  during  the  open-
     water season of 1975 by means  of  a  pontoon-equipped  Huey heli-
     copter.   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  enu-
     meration.  During the first and last visits,  18.9-liter  depth-
     integrated samples were composited  for  algal  assays.  Maximum
     depths sampled were 33.5  meters at  Station 01,  27.4  meters at
     Station  02,  and 15.2 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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MAGIC RESERVOIR
STOPET CODE 1*09
                                                     PHYSICAL AND CHEMICAL CHARACTERISTICS
(
(
f


(


(
PARAMETER
TEMPERATURE (OEG
0.-1.5 M DEPTH
MAX. DEPTH**

DISSOLVED OXYGEN
0.-1.5 M DEPTH
MAX DEPTH**
( 5/15/75
S««» = 3
M-o afiNGF. MEDIAN
CENT)
6
3

(«G/L)
6
3

10.6- 15.5
5.3- 5.7


8.4- 10.0
8.6- 8.6

11.9
5.5


9.1
*.6
)
«AX
DEPTH
RANGE
(METEKS)

0.0-
15.2-


0.0-
15.2-

1.5
33.5


1.5
33.5
N*

6
3


6
2
( 8/ 5/75
S««* = 3
RANGE MEDIAN

20.0- 21.2
11.6- 14.6


6.2- 8.2
0.3- 2.8

21.1
12.2


7.7
1.5
)
MAX
OEPTH
RANGE
(METERS)

0.0-
14.6-


0.0-
25.9-

1.5
31.4


1.5
31.4
N*

6
3


6
3
( 9/17/75 1
S»«« = 3
RANGE MEDIAN

17.4- 18.3
13.9- 17.4


7.0- 9.0
0.6- 7.6

17.5
15.5


7.6
1.4
»
MAX
DEPTH
RANGE
(METERS)

0.0- 1.5
7.0- 24.7


0.0- 1.5
7.0- 24.7
CONDUCTIVITY (UMHOS)
(

(






(










V


0.-1.5 M DEPTH
MAX DEPTH**
6
3
122.- 137.
116.- 122.
131.
117.
0.0-
15.2-
1.5
33.5
5
3
166.- 176.
150.- 166.
170.
161.
0.0-
14.6-
1.5
31.4
6
3
181.- 185.
171.- 183.
183.
181.
0.0- 1.5
7.0- 24.7
PH (STANDARD UNITS)
0.-1.5 M DEPTH
MAX DEPTH**
TOTAL ALKALINITY
0.-1.5 M DEPTH
MAX DEPTH**
TOTAL P (MG/L)
O.-l.'i M OEPTH
MAX DEPTH**
DISSOLVED ORTHO P
0.-1.5 M OEPTH
MAX DEPTH**
N02+N03 (MG/L)
0.-1.5 M OEPTH
MAX DEPTH**
AMMONIA (MG/L)
0.-1.5 M OEPTH
VAX DEPTH**
KJELOAHL N (MG/L)
0.-1.5 M DEPTH
^AX DEPTH**
6
3
(MG/L)
6
3

6
3
(MG/L)
6
3

6
3

6
3

6
3
7.1- 8.3
7.5- 7.9

66.- 90.
85.- 95.

0.083-0.115
O.OS1-0.135

0.025-0.051
0.034-0.050

0.320-0.430
0.460-0.500

0.040-0.060
0.050-0.070

0.500-1.100
0.400-0.600
8.0
7.5

81.
9?.

0.097
0.084

0.033
0.044

0.3R5
0.470

0.045
0.060

0.700
0.600
0.0-
15.2-

0.0-
15.2-

0.0-
15.2-

0.0-
15.2-

0.0-
15.2-

0.0-
15.2-

0.0-
15.2-
1.5
33.5

1.5
33.5

1.5
33.5

1.5
33.5

1.5
33.5

1.5
33.5

1.5
33.5
5
3

6
3

6
3

6
3

6
3

6
3

6
3
8.8- 8.9
7.4- 8.1

88.- 95.
96.- 104.

0.011-0.024
0.027-0.129

0.005-0.013
0.021-0.067

0.020-0.020
0. 1 10-0.240

0.020-0.030
0.050-0.150

0.200-0.200
0.200-0.400
8.8
7.7

94.
96.

0.013
0.129

0.011
0.029

0.020
0.200

0.020
0.060

0.200
0.300
0.0-
14.6-

0.0-
14.6-

0.0-
14.6-

0.0-
14.6-

0.0-
14.6-

0.0-
14.6-

0.0-
14.6-
1.5
31.4

1.5
31.4

1.5
31.4

1.5
31.4

1.5
31.4

1.5
31.4

1.5
31.4
6
3

6
3

6
3

6
3

6
3

6
3

6
3
8.4- 8.8
7.6- 8.6

106.- 116.
103.- 116.

0.033-0.058
0.041-0.289

0.005-0.010
0.004-0.165

0.020-0.020
0.020-0.100

0.020-0.020
0.020-0.330

0.200-0.400
0.200-0.600
8.5
7.7

115.
113.

0.038
0.145

0.006
0.085

0.020
0.020

0.020
0.080

0.250
0.400
0.0- 1.5
7.0- 24.7

0.0- 1.5
7.0- 24.7

0.0- 1.5
7.0- 24.7

0.0- 1.5
7.0- 24.7

0.0- 1.5
7.0- 24.7

0.0- 1.5
7.0- 24.7

0.0- 1.5
7.0- 24.7
SECCHI DISC
                           0.3-  0.9
                                        0.4
                                                               4.9-  4.9
                                                                            4.9
1.2-  2.7
                                                                                                                2.0
                         * N = NO. OF SAMPLES
                         «» MAXIMUM DEPTH SAMPLED AT EACH SITE
                         «** S = NO. OF SITES SAMPLED ON THIS DATE

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B.   Biological  Characteristics:

     1.    Phytoplankton -
          Sampling
          Date

          05/15/75
          08/05/75
          09/17/75
Dominant
Genera
1.
2.
3.
Stephanodiscus
Chroomonas
Cryptomonas

Other genera

     Total
1.
2.
3.
4.
5.
Chroomonas
Cryptomonas
Frag il aria
Asterionella
Anabaena
    Other genera

         Total

1.   Aphanizomenon
2.   Ceratium
3.   Chroomonas
4.   Melosira
5.   Cryptomonas

    Other genera

         Total
Algal
Units
per ml

 4,099
   592
    42
 4,733

   132
    75
    75
    56
    38

	56_

   432

 3,297
   230
   153
   153
    38
                                                             3,871

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2.   Chlorophyll a_ -
     Sampling                 Station              Chlorophyll  a_
     Date                     Number               (,'9/1)

     05/15/75                   01                      11.6
                                02                       2.6
                                03                       1.3

     08/05/75                   01                       2.1
                                02                       4.4
                                03                       2.2

     09/17/75                   01                      27.3
                                02                       7.2
                                03                       7.2

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                                10
C.   Limiting Nutrient Study:

     1.   Autoclavedj filtered,  and nutrient spiked  -

          a.   05/15/75
Spike (mg/1)
Control
0.05 P
0.05 P + 1.0
1.00 N
Ortho P
Cone. (mg/1)
0.025
0.075
N 0.075
0.025
Inorganic N
Cone. (mg/1 )
0.450
0.450
1.450
1.450
Maximum Yield
(mg/1 -dry wt. )
8.3
16.5
28.8
7.8
          b.   09/17/75

          Control            0.020          0.070            1.3
          0.05 P            0.070          0.070            1.1
          0.05 P + 1.0 N    0.070          1.070           15.3
          l.OON            0.020          1.070            2.6

     2.   Discussion -

               The control  yields of the assay alga,  Selenastrum

          capricornutum, indicate that the potential  primary pro-

          ductivity of Magic Reservoir was high at the time of both

          sample collections (05/15/75, 09/17/75).  In the May assay,

          a significant increase in yield occurred when phosphorus  was

          added alone and in combination with nitrogen, indicating

          phosphorus limitation.  The addition of only nitrogen  resulted

          in a yield which was not significantly greater than that  of

          the control.  In the September assay, the addition of  nitrogen

          alone produced a slight increase in yield over that of the

          control, suggesting nitrogen limitation at  that time.   The ad-

          dition of phosphorus alone did not result in a yield greater

          than that of the control.

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                       11
     The mean inorganic nitrogen to orthophosphorus (N/P)
ratios in the lake data were 13/1, <6/l,  and <3/l  in the
spring, summer, and fall, respectively,  suggesting primary
limitation by nitrogen (a mean N/P ratio  of 14/1  or greater
generally reflects phosphorus limitation).

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                                12
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),  ex-
     cept for the high runoff  months  of  June and July  when two sam-
     ples were collected.   Sampling 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 pro-
     vided 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  loadings indicated for
     tributaries 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/km2/yr, in Camas  Creek and Rock Creek
     at Stations C-l and E-l,  and  multiplying  the means  by the ZZ
     area in km?.

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                           13
     Monthly chemistry and flow data  for  the  Ketchum and
Hailey wastewater treatment plants, and nutrient  loads for
the Mountain Meadows Mobile Home Park plant were  ^ovided
by the Idaho Department of Health and Welfare (M.  Smith,
1976).

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                                     14
A.   Waste Sources:

     1.    Known municipal -
     Name

     Ketchum

     Hailey

     Mountain Meadows
      Mobile Home Park
Pop.*
Served
   300
         Treatment*
2,840t   Extended
          aeration
1,450    Extended
          aeration
         Extended
Mean Flow
(m3/d x IP3)

   4.383

   1.086

   0.114**
           aeration
Receiving
Water

Big Wood
 River
Big Wood
 River
Big Wood
 River
     2.   Known industrial - None
      *M. Smith, 1976.
     ^Estimated at 0.3785 m3/capita/day.
      tFlow and nutrient loadings from Ketchum - Sun Valley plant also
       include an estimated 6,260 peak winter nonresidents and 4,440 peak
       summer nonresidents.

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                                15
B.   Annual Total Phosphorus Loading - Average Year:

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

          a.   Tributaries (nonpoint load) -

               A-2 Big Wood River              9,310         22.8
               C-l Camas Creek                18,335         45.0
               D-l Poison Creek                  915          2.3
               E-l Rock Creek                  1,180          2.9

          b.   Minor tributaries and immediate
               drainage (nonpoint load) -      1,960          4.8

          c.   Known municipal STP's -

               Ketchum                         6,195         15.2
               Hailey                          2,080          5.1
               Mountain Meadows Mobile           495          1.2
                Home Park

          d.   Septic tanks* -                     5         <0.1

          e.   Known industrial - None

          f.   Direct precipitation** -          275          0.7

                              Totals          40,750        100.0

     2.    Output - A-l Big Wood River         16,845

     3.    Net annual P accumulation -         23,905
      *Estimate based on 31  lakeshore residences (summer use only)
     **Estimated (see NES Working Paper No.  175).

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                                16
C..   Annual Total Nitrogen Loading - Average Year:

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

          a.   Tributaries (nonpoint load) -

               A-2 Big Wood River            178,555         43.7
               C-l Camas Creek               139,530         34.1
               D-l Poison Creek               11,160          2.7
               E-l Rock Creek                 12,485          3.1

          b.   Minor tributaries and immediate
               drainage (nonpoint load) s     17,840          4.4

          c.   Known municipal STP's -

               Ketchum                        24,325          5.9
               Hailey                          7,020          1.7
               Mountain Meadows Mobile           910          0.2
                Home Park

          d.   Septic tanks* -                   110         <0.1

          e.   Known industrial - None

          f.   Direct precipitation** -       17,060          4.2

                              Totals         408,995        100.0

     2.    Output - A-l Big Wood River        359,260

     3.    Net annual fl accumulation -         49,735
      *Estimate based on 31 lakeshore residences (summer use only)
     **Estimated (see NES Working Paper No. 175).

-------
                                 17
D.   Mean Annual Nonpoint Nutrient Export by Subdrainage Area:
     Tributary                          kg P/km^/yr    kg N/km^/yr
     Big Wood River                           4             83
     Camas Creek                             11             83
     Poison Creek                            49            597
     Rock Creek                              11            118
E.   Mean Nutrient Concentrations in Ungaged Streams:
                                        Mean Total  P   Mean Total  N
     Tributary                             (mg/1)          (mg/1)
     B-l Lava Creek   *                    0.053          0.577
     F-l Camp Creek                        0.071          0.688
          Nutrient levels for these ungaged tributaries to Magic
     Reservoir are in line with those found in Big  Wood River and
     Camas Creek, but somewhat lower than those found  in the other
     two gaged tributaries to the lake.

-------
                                18
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 water 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
                               (g/m2/yr)
     Estimated loading for Magic Reservoir                        2.58
     Vollenweider's "eutrophic" loading                           1.08
     Vollenweider's "oligotrophic" loading                        0.54

-------
                                 19
V.   LITERATURE REVIEWED

     Falter, C. Michael.  1973.   Limnology of Magic Reservoir,
       Big Wood River, Idaho.   University of Idaho, Moscow,  Idaho.
       Submitted to:  U.S.  Army Corps of Engineers, Wall^  Walla
       District, Idaho.

     Martin, R. 0.  R. and Ronald L.  Hansen.   1966.   Reservoirs
       in the United States.   U.S.G.S.  Water-Supply Paper  1838.
       U.S. Gov't Printing  Office,  Washington, D.C.

     Smith, Michael  A.  1976.   Personal communication (sewage
       treatment plant information).   Idaho  Department of  Health
       and Welfare,  Division  of Environment.   Boise, Idaho.

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

     U.S. Geological Survey.   1972.   Water Resources Data  for
       Idaho, Part  1.  U.S. Department of the Interior, Surface
       Water Records, Boise,  Idaho.

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

-------
                                 20





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

-------
                                        TRIBUTARY FLOW INFORMATION FOR IDAHO

     LAKE CODE 1609     MAGIC RES.

          TOTAL ORAINAGF AREA OF LAKECSO KM)   4144.0
                                                        08/23/76
               SUB-DRAINAGE
     TRIBUTARY  AREA4
3.40
0.54
0.0
0.17
0.17
0.99
2.75
1.13
0.006
0.23
0.23
15.66
9.29
5.29
0.035
0.32
0.48
                                 SUMMARY
                             TOTAL DRAINAGE AREA OF LAKE =
                             SUM OF SUB-DRAINAGE AREAS   =
                       4144.0
                       4144.1
                            TOTAL FLOW
                            TOTAL FLOW
                         IN
                         OUT
185.14
187.34
          MEAN MONTHLY FLOWS AND DAILY FLOWS(CMS)

     TRIBUTARY   MONTH   YEAR    MEAN FLOW  DAY

     1609A1
     1609A2
10
11
12
1
2
3
4
5
6
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
                 FLOW  DAY
                   FLOW  DAY
                       FLOW
4.134
1.472
0.204
0.195
0.207
0.227
25.598
41.258
58.531
44.911
28.798
21.776
3.030
3.766
2.917
1.699
1.699
2.464
4.474
23.361
40.550
37.548
5.918
2.435
19
16
14
18
17
15
12
17
7
5
14
20
19
16
14
18
17
15
12
17
7
5
14
20
0.244
2.945
0.195
0.195
0.207
0.218
40.776
102.507
79.004 21
63.430 19
30.582
21.577
2.294
3.483
3.115
1.699
1.812
2.379
3.058
43.891
64.846 21
51.253 19
6.456
2.350








45.873
30.582










28.883
35.396



-------
                                   TRIBUTARY FLOW INFORMATION  FOR  IDAHO
                                                                                          08/23/76
LAKE CODE 1609
MAGIC RES.
     MEAN MONTHLY FLOWS AND DAILY FLOWS(CMS)

TRIBUTARY   MONTH   YEAR    MEAN FLOW  DAY

1609C1
1609D1
1609E1
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
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
74
74
74
75
75
75
75
75
75
75
75
75
                                FLOW  DAY
FLOW  DAY
FLOW
0.249
0.566
0.566
0.566
0.793
1.557
21.776
41.484
8.099
2.633
0.241
0.269
0.0
0.0
0.0
0.0
0.0
0.008
0.147
0.280
0.054
0.017
0.0
0.0
0.127
0.176
0.176
0.176
0.198
0.261
0.708
0.906
0.481
0.311
0.127
0.133
19
16
14
18
17
15
12
17
7
5
14
20
19
1*
14
18
17
15
1?
19
7
5
10
20
11
16
14
18
17
15
1?
17
7
•S
14
20
0.224
0.680
0.566
0.651
0.765
1.388
2.492
47.572
10.336
4.106
0.156
0.340
0.0
0.0
0.0
0.0
0.0
0.006
0.014
0.252
0.068
0.025
0.0
0.0
0.125
0.190
0.176
0.187
0.198
0.249
0.311
0.963
0.538
0.368
0.108
0.144








21
19










21

14









21
19


                                                                    5.947
                                                                    7.221
                                                                    0.040

                                                                    0.0
                                                                    0.425
                                                                    0.311

-------
        APPENDIX C



PHYSICAL AND CHEMICAL DATA

-------
STORtT RETRIEVAL DATE 76/08/35
NATL EUTROPHICATION SURVEY
EPA-LAS VEGAS
 160903
43 18 42.0 114 23  37.0  3
MAGIC RESERVOIR
16013   IDAHO
                                                                                            130691
                                                                  11EPALES              2111202
                                                                   0055 FEET  DEPTH   CLASS 00
DATE
FROM
TO
75/05/15




75/08/05




75/09/17




DATE
FROM
TO
75/05/15




75/08/05




75/09/17



TIME DEPTH
OF
DAY FEET
15 10 0000
15 10 0005
15 10 0015
15 10 0030
15 10 0050
07 45 0000
07 45 0005
07 45 0015
07 45 0030
07 45 0048
10 55 0000
10 55 0005
10 55 0015
10 55 0023

TIME DEPTH
OF
DAY FEET
15 10 0000
15 10 0005
15 10 0015
15 10 0030
15 10 0050
07 45 0000
07 45 0005
07 45 0015
07 45 0030
07 45 0048
10 55 0000
10 55 0005
10 55 0015
10 55 0023
00010
MATER
TEMP
CENT
15.5
10.6
7.4
6.1
5.7
21.1
21.2
20.6
16.9
14.6
17.4
17.4
17.5
17.4
00665
PHOS-TOT

MG/L P
0.115
0.096
0.082
0.083
0.081
0.013
0.011
0.013
0.027
0.027
0.033
0.033
0.038
0.041
00300
DO
MG/L
8.
8.
8.
9.
8.
7.
7.
7.
5.

7.
7.
7.
7.
32217
00077 00094
TRANSP CNDUCTVY
SECCHI FIELD
INCHES MICROMHO
8 12
4
8
2
6
4 192
4
2
8

6 108
6
8
6
00031
133
137
118
117
117
168

171
195
166
183
185
187
183

00400 00410
PH T ALK
CAC03
su
8.00
7.90
7.60
7.80
7.50

8.90
8.90
8.20
8.10
8.40
8.50
8.60
8.60

MG/L
66
82
82
83
85
93
94
94
111
104
115
116
117
116

00610 00625 00630 00671
NH3-N TOT KJEL N02&N03 PHOS-OIS
TOTAL N N-TOTAL ORTHO
MG/L
0.060
0.050
0.040
0.030
0.050
0.030
0.020
0.020
0.040
0.050
0.020K
0.020K
0.020K
0.020K

MG/L
0.900
0.600
0.400
0.400
0.400
0.200K
0.200K
0.200K
0.200K
0.200K
0.400
0.400
0.200
0.200K

M6/L
0.320
0.380
0.480
0.500
0.500 ,
0.020K
0.020K
0.020K
0.060
0.110
0.020K
0.020K
0.020K
0.020K

MG/L P
0.035
0.032
0.035
0.034
0.034,
0.013
0.011
0.011
0.018
0.021
0.010
0.006
0.005
0.004

CHLRPHYL INCDT LT
A
UG/L
1.




2.




REMNING
PERCENT
3




2
























































































7.2



























     K VALUE KNOWN TO BE LESS
          THAN INDICATED

-------
STORET RETRIEVAL DATE 76/08/35
NflTt EUTROPHICATIOM SURVEY
EPA-LAS  VEGAS

DATE
FROM
TO
75/05/15






75/08/05






75/09/17








TIME DEPTH
OF
DAY
14
14
14
14
14
14
14
08
08
08
08
08
08
08
11
11
11
11
11
11


FEET
00
00
00
00
00
00
00
45
45
45
45
45
45
45
20
20
20
20
20
20
0000
0005
0015
0025
0050
0080
0110
0000
0005
0020
0035
0055
0075
0103
0000
0005
0015
0030
0050
0081
00010
HATER
TEMP
CENT
12.3
11.1
9.8
8.1
6.1
5.8
5.5
21.2
21.1
20.6
16.8
U.O
12.8
11.6
18.3
18.3
18.3
18.3
18.2
13.9
 160901
43 15 28.0 lift 21
MAGIC RESERVOIR
16013   IDAHO
37.0 3
                                                                                             130691
                                                                   HEPALES              2111202
                                                                    0114 FEET  DEPTH   CLASS 00
00300
00

MG/L
9.3
10.0
10. 3
9.6
9.2
8.8
8.6
8.0
6.2
6.4
6.2
4.6
0.6
0.3
8.6
9.0
8.6
9.0
9.0
0.6
00077 00094
TRANSP CNDUCTVY
<=ECCHI FIELD
INCHES WICROMHO
36 132
129
129
136
121
121
122
192 166
170
166
171
161
162
161
48 183
181
183
183
183
171
00400
PH

su
8.30
8.10
8.00
7.50
8.00
7.30
7.90
8.80
8. BO
8.00
8.00
7.80
7.50
7.40
8.80
8.85
8.85
8.90
8.55
7.70
00410
T ALK
CAC03
MG/L
90
87
90
91
91
93
92
88
88
89
91
91
94
96
114
115
115
100
100
103
00610
NH3=N
TOTAL
MG/L
0.060
0.040
0.030
0.040
0.040
0.040
0.070
0.030
0.020
0.030
0.020
0.020
0.150
0.150.
0.020K
0.020K
0.020K
0.020K
0.050
0.330
00625
TOT KJEL
N
MG/L
1.100
0.600
0.600
0.500
0.400
0.400
0.600
0.200
0.200
0.200K
0.200
0.200K
0.400
0.400
0.200K
0.200
0.600
0.400
0.600
0.600
00630
N026.N03
N-TOTAL
MG/L
0.370
0.420
0.410
0.430
0.470
0.470
0.460.
0.020
0.020K
0.020K
0.040
0.1SO
0.200
0.200,
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
00671
PKOS-DIS
ORTHO
KG/L P
0.027
0.025
0.034
0.026
0.051
0.045
0.050
0.008
0.005
0.004
0.006
0.020
0.063
0.067
0.005
0.007
0.006
0.014
0.030
0.165
       K VALUE KNOWN TO BE LESS
            THAN INDICATED

-------
NATL EUTROPHICATION SURVEY
EPA-LAS VEGAS
                                    160901
                                   43  15  28.0  11* 21
                                   MAGIC  RESEHVOIR
                                   16013    IDAHO
                                                                 11EPALES
                                                                  0114  FEET
                                           27.0 3
                                                                                          130691
                                               DEPTH
                                              2111202
                                            CCflSS 00
                      00665
  DATE   TIME DEPTH PHOS-TOT
  FROM    OF
   TO    DftY  FEET   MG/L P
75/05/15






75/08/05






75/09/17





14
14
14
14
14
14
14
08
08
08
08
08
08
08
11
11
11
11
11
11
00
00
00
00
00
00
00
45
45
45
45
45
45
45
20
20
20
20
20
20
0000
0005
0015
0025
0050
0080
0110
0000
0005
0020
0035
0055
0075
0103
0000
0005
0015
0030
0050
0081
0.098
0 = 083
0.076
0.075
0.075
0.076
0.135
0.024
0.021
0.018
0.032
0.039
0.119
0.129
0.053
0.058
0.050
0.066
0.089
0.289
  32217
CHLRPHVL
   A
  UG/L

    Ilo6
  00031
INCDT LT
REMN1NG
PERCENT
                                   2.1
                                  27.3

-------
STORET RETRIEVAL DATE 76/08/25
NATL EUTROPHICATION SURVEY
EPA-LAS VEGAS
  DATE   TIME DEPTH
  FROM    OF
   TO    DAY  FEET
75/05/15 14
         14
         14
         14
         14
         14
75/08/05 08
         08
         08
         08
         08
         08
75/09/17 09
         09
         09
         09
         09
         09
35 0000
35 0005
35 0015
35 0030
35 0060
35 0090
20 0000
20 0005
20 0015
20 0033
20 0055
20 0085
50 0000
50 0005
50 0015
50 0030
50 0045
50 0068
 00010
WATER
 TEMP
 CENT

   11.6
   12.8
    9.5
    6.1
    5.5
    5.3
   21.1
   20.0
   20.9
   17.0
   14.1
   12.2
   17.6
   17.5
   17.6
   17.5
   17.0
   15.5
                                                       160903
                                                      43  17  05.0  114 22 28.0 3
                                                      MAGIC  RESERVOIR
                                                      16013    IDAHO
                                                                                            130691
11EPALES

00300
DO

MG/L
9.6
8.9
9.0
9.2
9.2
8.6
8.0
8.2
7.8
6.0
3.0
2.8
7.2
7.0
7.2
7.2
6.0
1.4

00077 00094
TRANSP CNOUCTVY
«:ECCHI FIELD
INCHES MICROMHO
14 122
126
120
118
117
116
192 176
172
172
164
152
150
183
183
183
183
189
181
009-
00400
PH

SU
8.00
7.10
7.70
7.50
7.40
7.50
8.80
8.80
8.70
8.00
7.70
7.70
8.40
8.50
8.50
8.45
8.15
7.65
t FEET OEf
00410
T ALK
CAC03
MG/L
72
79
88
92
92
95
94
95
96
104
95
96
106
109
110
111
114
113
2111202
>TM CLiSS
00610
NH3-N
TOTAL
MG/L
0.040
0.040
0.040
0.050
0.040
0.060
0.020
0.020
0.030
0.030
0.050
0.060.
0.020K
0.020K
0.020K
0.020K
0.020K
0.080
CO
00625
TOT KJEL
N
MG/L
0.800
0.500
0.500
0.500
0.500
0.600
0.200K
0.200K
0.200K
0.200K
0.200
0.300
0.200
0.300
0.200
0.200
0.200
0.400

00630
N02S.N03
N-TOTAL
MG/L
0.390
0.430
0.490
0.500
0.490
0.470
0.020K
0.020K
0.020K
0.020
0.180
0.240,
0.020K
0.020K
0.020K
0.020K
0.040
0.100

00671
PHOS-DIS
OHTHO
MG/L P
0.048
0.051
0.034
0.033
0.034
0.044
0.011
0.011
0.011
0.013
0.024
0.029
0.006
0.005
0.005
0.006
0.014
0.085
DATE
FROM
TO
75/05/15





75/08/05





75/09/17





00665 32217 00031
TIME DEPTH PHOS-TOT CHLRPHYL INCDT LT
OF A REMNING
DAY FEET
14
14
14
14
14
14
08
03
08
08
08
08
09
09
09
09
09
09
35
35
35
35
35
35
20
20
20
20
20
20
50
50
50
50
50
50
0000
0005
0015
0030
0060
0090
0000
0005
0015
0033
0055
0085
0000
0005
0015
0030
0045
0068
MG/L P
n.
0.
0.
0,
0.
0.
0.
0,
0,
0.
0,
0.
0,
0,
0,
0,
0,
0.
,103
,089
,079
,076
,076
,084
,014
,011
,017
.020
.108
.129
,039
,038
.040
.033
.044
.145
UG/L PERCENT
2.6





4.4





7.2





                                                               K VALUE KNOWN TO BE LESS
                                                                   THAN INDICATED

-------
STORET RETRIEVAL DATE 76/08/25
NATL EUTROPHICATION SURVEY
EPA-LAS VEGAS
 160903
43 18 42.0 114 23  37.0  3
MAGIC RESERVOIR
16013   IDAHO
                                                                                            130691
                                                                  11EPALES              2111202
                                                                   0055 FEET  DEPTH   CLASS 00
DATE
FROM
TO
75/05/15




75/08/05




75/09/17




DATE
FROM
TO
75/05/15




75/08/05




75/09/17



TIME DEPTH
OF
DAY FEET
15 10 0000
15 10 0005
15 10 0015
15 10 0030
15 10 0050
07 45 0000
07 45 0005
07 45 0015
07 45 0030
07 45 0048
10 55 0000
10 55 0005
10 55 0015
10 55 0023

TIME DEPTH
OF
DAY FEET
15 10 0000
15 10 0005
15 10 0015
15 10 0030
15 10 0050
07 45 0000
07 45 0005
07 45 0015
07 45 0030
07 45 0048
10 55 0000
10 55 0005
10 55 0015
10 55 0023
00010
WATER
TEMP
CENT
15.5
10.6
7.4
6.1
5.7
21.1
21.2
20.6
16.9
14.6
17.4
17.4
17.5
17.4
00665
PHOS-TOT

MG/L P
0.115
0.096
0.082
0.083
0.081
0.013
0.011
0.013
0.027
0.027
0.033
0.033
0.038
0.041
00300 00077 00094
DO TRANSP CNDUCTVY
SECCHI FIELD
MG/L INCHES MICROMHO
8.6 12
8.4
8.8
9.2
8.6
7.4 192
7.4
7.2
5.8

7.6 108
7.6
7.8
7.6
32217 00031
CHLRPHYL INCDT LT
A REMNING
UG/L PERCENT
1.3




2.2




7.2



133
137
118
117
117
168

171
195
166
183
185
187
183


















00400 00410
PH T ALK
CAC03
SU
8.00
7.90
7.60
7.80
7.50

8.90
8.90
8.20
8.10
8.40
8.50
8.60
8.60


















MG/L
66
B2
82
83
85
93
94
94
111
104
115
116
117
116


















00610 00625 00630 00671
NH3-N TOT KJEL N02&N03 PHOS-DIS
TOTAL N N-TOTAL ORTHO
MG/L
0
0
0
0
0
0
0
0
0
0
0
0
0
0


















.060
.050
.040
.030
.050
.030
.020
.020
.040
.050
.020K
.020K
.020K
.020K


















MG/L
0.900
0.600
0.400
0.400
0.400
0.200K
0.200K
0.200K
0.200K
0.200K
0.400
0.400
0.200
0.200K


















MG/L
0.320
0.380
0.4*0
0.500
0.500 .
0.020K
0.020K
0.020K
0.060
0.110
0.020K
0.020K
0.020K
0.020K


















MG/L P
0.035
0.032
0.035
0.034
0.034^
0.013
0.011
0.011
0.018
0.021.
0.010
0.006
0.005
0.004


















      K VALUE KNOWN TO BE LESS
          THAN INDICATED

-------
       APPENDIX D

TRIBUTARY AND WASTEWATER
  TREATMENT PLANT DATA

-------
STORET RETRIEVAL DATE 76/08/35
NATL EUTROPHICATION SURVEY
EPA- LAS VEGAS
  DATE   TIME DEPTH
  FROM    OF
   TO    DAY  FEET

75/04/12
75/05/17
75/06/07
75/06/31 10 45
75/07/05 13 30
75/07/19 08 00
75/08/14 17 30
75/09/20 12 30
 1609A1
43 15 05.0 114 21 30.0 4
BIG WOOD RIVER
16      15 BELLEVUE
0/MAGIC RESERVOIR        130691
8NK BELO MAGIC DAM ON DRT RD
11EPALES             2111204
 0000 FEET  DEPTH  CLASS 00
0630
!&N03
OTAL
IG/L
0.105
0.315
0.280
0.005
0.005
0.005
0.110
0.035
00625
TOT KJEL
N
MG/L
1.000
0.450
0.737
0.700
0.500
0.900
0.250
0.600
00610
NH3-N
TOTAL
MG/L
0.025
0.015
0.030
0.020
0.015
0.025
0.015
0.045
00671
PHOS-DIS
ORTHO
MG/L P
0.015
0.020
0.025
0.005
0.010
0.007
0.020
0.015
00665
PHOS-TOT

MG/L P
0.020
0.050
0.045
0.030
0.030
0.020
0.030
0.040

-------
STORET RETRIEVAL DATE 76/08/35
NATL EUTROPHICATION SURVEY
EPA- LAS VEGAS
  DATE   TIME DEPTH N02&.N03
  FROM    OF
   TO    DAY  FEET
74/10/19
74/11/16
74/12/14
75/01/18
75/02/17
75/03/15
75/04/12
75/05/17
75/06/07
75/06/21
75/07/05
75/07/19
75/08/14
75/09/20
09
10
12
11
16
11



13
11
11
18
10
10
00
30
45
00
15



30
31
00
30
00
 1609A2
43 19 45.0 114 31 30.0 4
BIG MOOD RIVER
16      15 8ELLEVUE
T/MAGIC RESERVOIR         130691
SURGING BRDG 600 FT S OF  RT  68 JCT
11EPALES             3111304
 OOQQ FEET  DEPTH  CLASS  00
0630
S,N03
OTAL
G/L
0.112
0.088
0.168
0.380
0.272
0.280
0.180
0.315
0.160
0.150
0.105
0.145
0.065
0.055
00625
TOT KJEL
N
MG/L
0.500
0.300
0.200
0.500
0.900
0.300
1.300
0.600

0.300
0.475
0.850
0.350
0.100
00610
NH3-N
TOTAL
MG/L
0.015
0.010
0.035
0.030
0.034
0.050
0.125
0.025
0.030
0.020
0.020
0.025
0.015
0.015
00671
PHOS-DIS
ORTHO
MG/L P
0.005
0.005
0.010
0.015
0.008
0.010
0.015
0.040
0.030
0.015
0.020
0.015
0.010
0.010
00665
PHOS-TOT

MG/L P
0.015
0.010K
0.020
0.015
0.020
0.030
0.030
0.060

0.080
0.140
0.040
0.070
0.070
    K VALUE KNOWN TO BE LESS
        THAN INDICATED

-------
NATL EUTROPHICATION SURVEY
EPA- LAS VEGAS
                      00630
  DATE   TIME DEPTH N02S.N03
  FROM    OF        N-TOTAL
   TO    DAY  FEET    MG/L
75/03/15 08 30
75/05/17
75/06/07
75/06/21 11 30
0.020
0.005
0.005
0.005
  00625
TOT KJEL
   N
  MG/L

   0.500

   0.450
   0.750
                                           1609B1
                                          43 17 45.0 114 26 00.0 4
                                          LAVA CREEK
                                          16      15 BELLEVUE
                                          T/MAGIC  RESERVOIR        130691
                                          UNMPRVD  RO XING 2.5 M NW OF MAGIC RESORT
                                          11EPALES             211120*
                                           oooo FEET  DEPTH  CLASS oo
 00610
NH3-N
TOTAL
 MG/L

  0.020
  0.015
  0.020
  0.020
  00671
PHOS-DIS
 ORTHO
 MG/L P

   0.065
   0.045
   0.010
   0.010
  00665
PHOS-TOT

 MG/L P

   0.100

   0.040
   0.020

-------
STORET RETRIEVAL DATE 76/08/35
NATL EUTROPHICATION SURVEY
EPA- LAS VEGAS
  DATE   TIME DEPTH N02&N03
  FROM    OF
   TO    DAY  FEET
74/10/19
74/11/16
74/12/14
75/01/18
75/02/17
75/03/15
75/04/12
75/05/17
75/06/07
75/06/21
75/07/05
75/07/19
75/08/14
75/09/20
11
09
13
10
10
10



09
12
09
17

00
00
30
45
00
15



00
00
00
45

 1609C1
43 19 59.0 11* 32 27.0 4
CAMUS CREEK
16      15 BLAINE
T/MAGIC RESERVOIR        130692
MACON SHEEP BRDG END RD .8 M S HKY 68 JT
11EPALES             2111204
 COOC FEET  DEPTH.  CLASS 00
0630
&N03
OTAL
IG/L
1.560
0.600
0.736
0.820
0.820
0.450
0.350
0.220
0.115
0.170
0.180
0.230
1.720
1.250
00625
TOT KJEL
N
MG/L
0.300
0.200
0.800
0.500
1.200
0.350
2.200
0.350
1.200
0.650
0.500
0.400
1.200
0.300
00610
NH3-N
TOTAL
MG/L
0.055
0.010
0.055
0.113
0.128
0.050
0.090
0.040
0.030
0.030
0.015
0.010
0.015
0.020
00671
PHOS-DIS
ORTHO
MG/L P
0.025
0.020
0.030.
0.035
0.080
0.050
0.045
0.050
0.045
0.035
0.045
0.035
0.025
0.020
00665
PHOS-TOT

MG/L P
0.035
0.030
0.070
0.040
0.098
0.080
0.080
0.100
0.230
0.070
0.070
0.060
0.060
0.050

-------
NA L I'J'1 K0i"'i L'.A , Ux
EPA- LAS VEGAS
  DATE   TIME DEPTH N02S.N03
  FROM    OF
   TO    DAY  FEET

75/03/15 10 45
75/04/12
75/05/19
75/06/07
75/06/21 12 00
75/07/05 09 20
43 20 38.0 114 25 00.0 4
POISON CREEK
16      15 BELLEWUE
T/MAGIC RESERVOIR         130691
UNMPRVD RO XING 1 MI N« HOT  SPRNGS LNDNG
11EPALES             2111204
 0000 FEET  DEPTH  CLASS  00
0630
S.N03
OTAL
G/L
0.115
0.260
0.195
0.025
0.015
0.020
00625
TOT KJEL
N
MG/L
0.200
1.600
0.900
0.550
0.450
0.650
00610
NH3-N
TOTAL
MG/L
0.010
0.113
0.035
0.020
0.030
0.025
00671
PHOS-DIS
ORTHO
MG/L P
0.045
0.115
0.060
0.055
0.045
0.070
00665
PHOS-TOT

MG/L P
0.050
0.160
0.080
0.100
0.050
0.110

-------
STORET RETRIEVAL DATE 76/08/25
NATL EUTROPHICATION SURVEY
EPA- LAS VEGAS
                      00630     00625     00610     00671
  DATE   TIME DEPTH N02S.N03   TOT KJEL   NH3-N    PHOS-DIS
  FROM    OF        N-TOTAL      N       TOTAL     ORTHO
   TO    DAY  FEET    MG/L      MG/L      MG/L     MG/L P
                       0.088     0.200     0.015     0.015
                       0.480     0.300     0.010     0.040
                       0.650     0.400     0.020     0.035
                       0.600     0.400.     0.035     0.040
                       0.504     0.900     0.032     0.040
                       0.375     0.400     0.010     0.045
                       0.450     1.700     0.100     0.055
                       0.550     0.400     0.015     0.065
                       0.260     1.100     0.030     0.060
                       0.230     1.050     0.025     0.055
                       0.430     0.800     0.035     0.090
                       0.170     1.550     0.030     0.085
                       0.035     0.800     0.015     0.055
                       0.120     1.300     0.135     0.065
74/10/19
74/11/16
74/12/14
75/01/18
75/02/17
75/03/15
75/04/12
75/05/17
75/06/07
75/06/21
75/07/05
75/07/19
75/08/14
75/09/20
09
09
14
11
10
11



12
14
10
18
10
35
45
10
30
30
00



01
30
00
30
30
      1609E1
     43 20 05.0 114 21 30.0 4
     ROCK CREEK
     16      15 BELLEVUE
     T/HAGIC RESERVOIR        130691
     RT 68 BRDG 5.3 MI W OF RT 93 JCT
     11EPALES       _     2111204
      0000 FEET  DEPTH  CL»55 00
  00665
PHOS-TOT

 MG/L P

   0.025
   0.040
   0.070
   0.080
   0.050
   0.100
   0.260
   0.110
   0.120
   0.080
   0.120
   0.130
   0.080
   0.090

-------
STORET RETRIEVAL DATE 76/08/35
NATL EUTROPHICATION SURVEY
EPA- LAS VEGAS
  DATE   TIME DEPTH N02S.N03
  FROM    OF
   TO    DAY  FEET
74/10/19
74/11/16
74/12/14
75/01/18
75/02/17
75/03/15
75/04/12
75/05/17
75/06/07
75/06/21
75/07/05
75/07/19
75/08/14
75/09/20
10
09
13
10
11
10



14
10
12
19
11
40
15
45
30
30
00



00
02
00
00
00
 1609F1
43 30 23.0 114 28 35.0 4
CAMP CREEK
16      15 8ELLEVUE
T/MAGIC RESERVOIR        130691
HWY 68 9RDG 10 MI ¥ OF US HXY 93 JCT
11EPALES             2111204
 0000 FEET  DEPTH  CLASS 00
0630
S.N03
OTAL
IG/L
0.184
0.152
0.168
0.144
0.136
0.140
0.125
0.390
0.055
0.035
0.020
0.035
0.050
0.120
00625
TOT KJEL
N
MG/L
0.400
0.300
0.400
0.700
0.300
0.300
1.300
1.500
0.800
0.300
0.450
0.400
0.425
0.300
00610
NH3-N
TOTAL
MG/L
0.035
0.015
0.020
0.025
0.024
0.010
0.040
0.020
0.025
0.030
0.015
0.015
0.015
0.060
00671
PHOS-DIS
ORTHO
MG/L P
0.037
0.040
0.030
0.035
0.032
0.030

0.050
0.055
0.045
0.085
0.060
0.055
0.040
00665
PHOS-TOT

MG/L P
0.070
0.040
0.050

0.078
0.060


0.090
0.070
0.100
0.070
0.092
0.060

-------
                            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 ranking, 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 depth, in inches, is subtracted from 500.
Similarly, minimum dissolved oxygen values are subtracted from 15
to create table entries.

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

LAKE
CODE  LAKE NAME

1601  AMERICAN FALLS RESERVOIR

1602  CASCADE LAKE

1603  LAKE COEUR O'ALENE

1604  DWOHSHAK RESERVOIR

1605  MAUSER

1606  HAYDEN LAKE

1607  ISLAND PARK RESERVOIR

1608  LAKE LOWELL

1609  MAGIC RESERVOIR

1610  PALISADES RESERVOIR

1611  LOWER PAYETTE

1612  LOWER TWIN LAKES

1613  UPPER TWIN LAKES
MEDIAN
TOTAL P
0.105
0.032
0.017
0.010
0.02S
0.010
0.034
0.070
0.062
0.024
0.013
0.016
0.017
MEDIAN
INORG N
0.030
0.060
0.040
0.080
0.075
0.040
0.050
0.070
0.130
0.080
0.060
0.050
0.045
500-
MEAN SEC
463.800
415.067
380.348
401.866
366.286
243.500
391.778
477.111
400.750
345.428
234.000
370.000
369.143
MEAN
CHLORA
15.379
8.031
10.391
2.420
11.112
2.787
9.322
25.389
7.322
2.067
4.600
2.318
4.986
15-
MIN DO
14.700
14.800
12.200
7.400
14.800 "
11.800
12.800
14.600
14.700
12.800
9.600
13.600
8.200
MEDI,
DISS ORTI
0.035
0.009
0.005
0.009
0.013
0.003
0.012
0.015
0.020
0.007
0.007
0.009
0.004

-------
PERCENT or LAKES WITH HIGHER VALUES (NUMBER or LAKES WITH HIGHER VALUES)

LAKE                                   MEDIAN     MEDIAN      500-          MEAN         15-         MEDIAN
CODE  LAKE NAME                        TOTAL P    INORG N    MEAN SEC      CHLORA       MIN DO    OISS ORTHO P

1601  AMERICAN FALLS RESERVOIR          0(0)    17 (  1)     8(1)     8(1)     21 <  2)      0(0)

1602  CASCADE LAKE                     33  (4)    54 (  6)     17  (  2)    42  (  5)      4 (  0)     50 (  5)

1603  LAKE COEUR D'ALENE               67  (8)    96 ( 11)     50  (6)    25  <  3)     67 C  8)     83 ( 10)

1604  DWORSHAK RESERVOIR               96  ( ID    17 (  1)     25  (  3)    83  <  10)    100 ( 12)     50 (  5)

1605  HAUSER                           42  (  5)    33 (  4)     75  (  9)    17  (  2)      4 (  0)     25 (  3)

1606  KAYDEN LAKE                      96  ( 11)    96 ( 11)     92  (  11)    75  (  9)     75 (  9)    100 ( 12)

1607  ISLAND PARK RESERVOIR            25  (3)    71 (  8)     42  (5)    33  (  4)     54 (6)     33 (  4)

1608  LAKE LOWELL                       8  (  1>    42 (  5)     0(0)     0(0)     33 (  4)     17 (  2)

1609  MAGIC RESERVOIR                  17  (  2)     0(0)     33  (  4)    50  (  6)     21 <  2)      8 (  1)

1610  PALISADES RESERVOIR              50  (6)    17 (  1)     83  (  10)    100  (  12)     54 (6)     75 (  9)

1611  LOWER PAYETTE                    83  ( 10)    54 <  6)    100  (  12)    67  (8)     83 ( 10)     67 (  8)

1612  LO*ER TWIN LAKES                 75  (  9)    71 (  8) .    58  (  7)    92  (  11)     42 (5)     50 (  5)

1613  UPPER TWIN LAKES                 58  (7)    83 ( 10)     67  (8)    58  (   7)     92 ( 11)     92 ( 11)

-------