U.S. ENVIRONMENTAL PROTECTION AGENCY
           NATIONAL EUTROPHICATION  SURVEY
                    WORKING PAPER SERIES
                                         REPORT
                                          ON
                                     OXBW RESEWOIR
                                   BAKER COUNTY, OREGON
                                   ADAMS GOUMY, IDAHO
                                       EPA REGION X
                                   WORKING PAPER No, 832
 CORVALLIS ENVIRONMENTAL RESEARCH LABORATORY - CORVALLIS, OREGON
                             and
ENVIRONMENTAL MONITORING & SUPPORT LABORATORY - LAS VEGAS, NEVADA

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                                    REPORT
                                      ON
                               OXBOW RESEfMHR
                             BAKER COUNTY, OREGON
                             ADAMS GOIMIY, IDAHO
                                 EPA REGION X
                            WORKING PAPER No, 832
         WITH THE COOPERATION OF THE
OREGON DEPARTMENT OF ENVIRONMENTAL QUALITY,
THE IDAHO DEPARTMENT OF HEALTH AND WELFARE,
       AND THE OREGON NATIONAL GUARD
                M«CH,  1978

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                               CONTENTS
  Foreword                                                i i



  List of Oregon Lakes and Reservoirs                     iv



  Lake or Reservoir Drainage Area Map                      v





  Secttons



  I,   Conclusions                                          1



 II .   Drainage Basin Characteristics                      4



III.   Water Quality Summary                               5



 IV.   Nutrient Loadings                                   9



  V.   Literature Reviewed            .                    13



 VI.   Appendices                                         14

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                                  11
                          FOREWORD
     The  National  Eutrophication Survey was initiated in 1972  in
 response to an Administration commitment to investigate the nation-
 wide threat of accelerated eutrophication to freshwater lakes and
 reservoirs.

 OBJECTIVES

     The  Survey was designed to develop, in conjunction with state
 environmental agencies, information on nutrient sources, concentrations,
 and  impact on selected freshwater lakes as a basis for formulating
 comprehensive and coordinated national, regional, and state management
 practices relating to point-source discharge reduction and non-point
 source pollution abatement in lake watersheds.

 ANALYTIC APPROACH

     The mathematical and statistical procedures selected for the
 Survey's eutrophication analysis are based on related concepts that:

        a.  A generalized representation or model relating
     sources, concentrations, and impacts can be constructed.

        b.  By applying measurements of relevant parameters
     associated with lake degradation, the generalized model
     can be transformed into an operational  representation of
     a lake, its drainage basin, and related nutrients.

        c.  With such a transformation, an assessment of the
     potential  for eutrophication control  can be made.

 LAKE ANALYSIS

     In this report,  the first stage of evaluation of lake and water-
 shed data collected from the study lake and its drainage basin is
 documented.   The report is formatted to provide state environmental
 agencies with  specific information for basin planning [§303(e)J, water
 quality criteria/standards review [§303(c)j,  clean lakes [§314(a,b)J,
and water quality monitoring [§106 and §305(b)] activities mandated
 by the Federal  Water Pollution Control  Act  Amendments of 1972.

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     Beyond the single lake analysis, broader based correlations
between nutrient concentrations (and loading) and trophic condi-
tion are being made to advance the rationale and data base for
refinement of nutrient water quality criteria for the Nation's
fresh water lakes.  Likewise, multivariate evaluations for the
relationships between land use, nutrient export, and trophic
condition, by lake class or use, are being developed to assist
in the formulation of planning guidelines and policies by EPA
and to augment plans implementation by the states.

ACKNOWLEDGEMENT

     The staff of the National Eutrophication Survey (Office of
Research & Development, U. S. Environmental Protection Agency)
expresses sincere appreciation to the Oregon Department of
Environmental Quality and the Idaho Department of Health and
Welfare for professional involvement and to the Oregon National
Guard for conducting the tributary sampling phase of the Survey.

     William H.  Young, Director; Harold L. Sawyer,  Administrator,
and the staff of the Water Quality Control Division of the Oregon
Department of Environmental Quality; and the staff of the Division
of Environment of the Idaho Department of Health and Welfare
provided invaluable lake documentation and counsel  during the
Survey, reviewed the preliminary reports, and provided critiques
most useful in the preparation of this Working Paper series.

     Brigadier General Richard A. Miller, the Adjutant General
of Oregon, and Project Officer Lt. Colonel John Mewha, who directed
the volunteer efforts of the Oregon National Guardsmen, are also
gratefully acknowledged for their assistance to the Survey.

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                                IV
                    NATIONAL EUTROPHICATION SURVEY

                     STUDY LAKES and RESERVOIRS

                           STATE OF OREGON


NAME                                         COUNTY

Brownlee                                     Baker, OR; Washington, ID

Diamond                                      Douglas

Hells Canyon                                 Baker, Wallowa, OR; Adams,
                                              Idaho, ID

Hills Creek                                  Lane

Owyh.ee                                       Malhuor

Oxbow                              .          Baker, OR; Adams, ID

Suttle                                       Jefferson

Waldo                                        Lane

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    11655
                          06A1/03A2
                                           outlet
  OXBOW  RESERVOIR



<8>  Tributary Sampling Site


X  Lake  Sampling Site





     1234
         1    ScaTe 2
                            3 Mi
                                              \02

                                                                        4455-
    Ore.
Map Location
                   3B1
                   •^^f




                J06A2
                      Dam
          '"••\ Brownlee

        ?•'•'']  Reservoir
                                                                        4450-

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                             OXBOW RESERVOIR
                             STORE! NO. 4106
I.  CONCLUSIONS
    A.  Trophic Condition:
            Survey data indicate Oxbow Reservoir is eutrophic.  It
        ranked sixteenth in overall trophic quality when the 21
        Oregon and Idaho lakes and reservoirs sampled in 1975 were
        compared using a combination of six water quality parameters*.
        Seventeen of the water bodies had less median total  phosphorus
        and dissolved orthophosphorus, all of the others had less
        median inorganic nitrogen, 13 had less mean chlorophyll a^,
        and 14 had greater mean Secchi disc transparency.  Some depression
        of dissolved oxygen with depth occurred at stations  1 and 2
        in August and September.
            Survey limnologists did not observe surface concentrations
        of algae; however, the relatively high chlorophyll  a^ concen-
        tration at station 2 in April is indicative of a near-bloom con-
        dition (see page 7).
    B.  Rate-Limiting Nutrient:
            The algal assay results are not considered representative of
        conditions in the reservoir at the time the samples  were collected
        (09/15/75).
            The reservoir data indicate phosphorus limitation in April
        but nitrogen limitation in August and September.
* See Appendix A.

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                                     2
    C.  Nutrient Controllability:
            1.  Point sources—No known point sources directly impacted
        Oxbow Reservoir during the sampling year.   However, those point
        sources contributing nutrients to upstream Brownlee Reservoir*
        probably affect Oxbow Reservoir as well, since 54% of the phos-
        phorus input to Brownlee Reservoir was not retained and entered
        Oxbow Reservoir.
            The sampling year phosphorus loading of 183.51 g/m2 is over
        20 times that proposed by Vollenweider (Vollenweider and Dillon,
        1974) as a eutrophic loading (see page 12).  Although Vollenweider's
        model may not be applicable to water bodies with short hydraulic
        retention times, the trophic condition of Oxbow Reservoir is
        evidence of excessive nutrient loads.  Any improvement in water
        quality would require minimization of the nutrient loads from
        both non-point sources and the point sources impacting upstream
        Brownlee Reservoir.
            2.  Non-point sources—As considered in this report, "non-point"
        sources include those contributing nutrients as a result of human
        activities (e.g., agricultural practices,  urbanization, extractive
        processes, etc.) as  well as natural sources (i.e., direct precipi-
        tation, leaf fall, wild birds and animals, etc.).
            The apparent non-point source phosphorus contribution accounted
        for all of the total phosphorus load during the sampling year.  How-
        ever, as stated above, part of this load is attributable to point
* Working Paper No.  827.

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                             3
sources further upstream.
    The Snake River contributed 99.0% of the total  phosphorus
load, and the Wildhorse River contributed 0.6%.   The ungaged
minor tributaries and immediate drainage contributed an esti-
mated 0.4%.

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II.   RESERVOIR AND DRAINAGE BASIN CHARACTERISTICS7

     A.   Morphometry  :

         1.   Surface area:   5.66 kilometers2.

         2.   Mean depth:   11.4 meters.

         3.   Maximum depth:  38.1  meters.

         4.   Volume:  64.758 x 106  m3.

         5.   Mean hydraulic retention  time:   1  day.

     B.   Tributary and Outlet:
         (See Appendix C  for flow data)
         1.   Tributaries -
             Name

             Snake River
             Wildhorse River
             Minor tributaries  &
              immediate drainage -
Drainage
area (km2)*

 188,033.9
     458.4

     312.9
                            Totals               188,805.2

         2.   Outlet -

             Snake River

     C.   Precipitation****:

         1.   Year of sampling:   27.0  centimeters.

         2.   Mean annual:   27.3  centimeters.
Mean flow
(m3/sec)*

 526.270
   4.920

   1.470

 532.660**
 188,810.9***   532.660
 t Table of metric equivalents—Appendix  B.
 tt McHugh, 1972;  Martin  and  Hanson,  1966.
 * For limits  of accuracy,  see  Working  Paper  No.  175,  "...Survey Methods,
   1973-1976".
 ** Sum of inflows adjusted to  equal  outflow.
 *** Includes  area of reservoir.
 **** See Working  Paper No. 175.

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                                       5
III.   WATER QUALITY SUMMARY
      Oxbow Reservoir 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
  a number of depths at three stations on  the reservoir (see map,  page v).
  iDuring each visit, a single depth-integrated (4.6 m to surface)  sample
  was composited from the stations for phytoplankton identification and
  enumeration; and during the September visit, a single 18.9-liter depth-
  integrated sample was collected from each of the stations for chlorophyll
  ^analysis.  The maximum depths sampled  were 29.3 meters at station 1,
  34.7 meters at station 2, and 12.5 meters at station 3.
      The sampling results are presented in full in Appendix D and are
  summarized in the following table.

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                             A. SUMMARY OF PHYSICAL AND
                                  CHEMICAL CHARACTERISTICS FOR
                                   STORET CODE 4106
                  OXBOH! RESERVOIR
PARAMETER

TEMP (C)

OISS OXY (MG/L)

CNDCTVY (MCROMO)

PH (STAND UNITS)

TOT ALK (MG/L)

TOT P (MG/L)

ORTHO P (MG/L)

N02+N03 (MG/L)

AMMONIA (MG/L)

KJEL N  (MG/L)

INORG N (MG/L)

TOTAL N (MG/L)

CHLRPYL A (UG/D

SECCHI  (METERS)
       1ST SAMPLING ( 4/

             3 SITES

     RANGE        MEAN

  6.9  -   7.6     7.3

 15.2  -  15.6    15.5

 237.  -  247.    240.

  8.4  -   8.5     8.5

 129.  -  134.    131.

0.074  - 0.087   0.080

0.024  - 0.051   0.036

0.640  - 0.660   0.645

0.040  - 0.060   0.052

0.300  - 0.500   0.385

0.680  - 0.720   0.697

0.940  - 1.150   1.030

 13.3  -  23.0    18.0

  0.5  -   0.8     0.7
                                               9/75)
2ND SAMPLING ( 8/ 4/75)

      3 SITES
                                                                                                          3RD SAMPLING  ( 9/15/75)

                                                                                                                3 SITES
MEDIAN
7.4
15.6
239.
8.4
131.
0.081
0.037
0.640
0.050
0.400
0.700
1.040
17.7
0.7
RANGE
17.7
2.8
233.
8.1
95.
0.036
0.012
0.160
0.020
0.200
0.180
0.460
3.4
0.4
- 23.9
9.2
- 281.
8.9
- 102.
- 0.057
- 0.043
- 0.360
- 0.040
- 0.300
- 0.380
- 0.660
8.7
3.2
MEAN
20.3
6.0
257.
8.4
99.
0.048
0.032
0.300
0.027
0.250
0.327
0.550
5.7
2.3
MEDIAN
20.3
5.8
261.
8.4
101.
0.050
0.034
0.300
0.030
0.250
0.335
0.540
5.0
3.2
RANGE
20.9
4.0
417.
8.0
151.
0.065
0.063
0.670
0.020
0.200
0.690
0.890
6.1
2.4
- 21.8
8.6
- 426.
8.2
- 171.
- 0.096
- 0.067
- 0.710
- 0.070
- 0.500
- 0.780
- 1.210
8.5
3.4
MEAN
21.2
4.9
420.
8.1
162.
0.074
0.065
0.691
0.023
0.269
0.714
0.960
7.2
2.7
MEDIAN
21.1
4.6
419.
8.1
166.
0.072
0.064
0.690
0.020
0.250
0.710
0.940
7.1
2.4

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B.
Biological  characteristics:
    1.
    Phytoplankton -
Sampling
Date
04/09/75





08/04/75


09/15/75


Domi nant
Genera
1. Stephanodiscus sp.
2. Asterionella sp/
3. Melosira sp.
4. Surirella sp.
5. Chroomonas (?) sp.
Other genera
Total
1 . Fragilaria sp'.
2. Stephanodiscus S£.
Total
1. Melosira SJD.
2. Cyclotella sp.
3. Cryptomonas sp.
Algal Units
„ per ml
5,621
300
257
'43
43
44
6,308
433
31
464
807
70
35
    2.   Chlorophyll  a_ -

        Sampling
        Date

        04/09/75
        08/04/75



        09/15/75
                                          Total
                          Station
                          Number

                             1
                             2
                             3

                             1
                             2
                             3

                             1
                             2
                             3
                                                       912
Chlorophyll  a
   13.3
   23.0
   17.7

    8.7
    5.0
    3.4

    7.1
    8.5
    6.1

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                                 8
C.   Limiting Nutrient Study:
        The algal  assay results are not considered representative
    of conditions  in the reservoir at the time the sample was  col-
    lected (09/15/75) due to  significant changes  in the nutrient
    levels in the  sample during shipment from the field to the
    laboratory.
        The reservoir data indicate phosphorus limitation in April
    and, nitrogen limitation in August and September.   The mean inor-
    ganic nitrogen/orthophosphorus ratios in April  were 14/1 or
    greater at'all  stations and were 12/1 or less at all  stations
    in August and  September.

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IV.   NUTRIENT LOADINGS
     (See Appendix E for data)
     For the determination of nutrient loadings,  the  Oregon  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 month of February when  two samples 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 provided by
 the Oregon District Office of  the U.S.  Geological  Survey for the
 tributary sites nearest the  reservoir.
     In this report, nutrient loads for sampled tributaries  were
 determined by using a modification of a U.S.  Geological Survey  com-
 puter program for calculating  stream loadings*.  Nutrient loads for
 unsampled "minor tributaries and immediate drainage"1 ("ZZ"  of U.S.G.S.)
 were estimated using the nutrient loads at station B-l, in  kg/kmVyear,
 and multiplying by the ZZ area in km2.
                         i
     No known wastewater treatment plants directly  impacted  Oxbow
 Reservoir during the sampling  year.'
 * See Working Paper No.  175.

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                                     10
    A,  Waste Sources:
        1.  Known municipal - None
        2.  Known industrial - None
    B.  Annual Total Phosphorus Loading - Average Year:
        1.  Inputs -
                                              kg P/          % of
            Source                            yr             total
            a.  Tributaries (non-point load) -
                Snake River                 1,023,210         98.5
                Wildhorse River                 9,075          0.9
            b.  Minor tributaries & immediate
                 drainage (non-point load) -    6,260          0.6
            c.  Known municipal STP's - None.
            d.  Septic tanks - None
            e.  Known industrial - None           -
            f.  Direct precipitation* -           100        < O.t.
                           Total            1,038,645        100.0
        2.,  Outputs -
            Reservoir outlet - Snake River    895,060
        3.  Net annual P accumulation - 143,585 kg.
* See Working Paper No. 175.

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                                     11
    C.  Annual  Total  Nitrogen Loading -  Average Year:
        1.   Inputs -
                                              kg N/          % of
            Source                            yr             total
            a.  Tributaries (non-point load) -
                Snake River                18,218,785         98.6
                Wildhorse River               151,760          0.8
            b.  Minor tributaries & immediate
                 drainage (non-point load)  -  103,570          0.6
            c.  Known municipal  STP's - None
            d.  Septic tanks - None
            e.  Known industrial  - None
            f.  Direct precipitation* -         6,110        < 0.1
                           Total            18,480,225        100.0
        2.   Outputs -
            Lake outlet - Snake River      25,222,530
        3.   Net annual N loss - 6,742,305 kg.
    D.   Non-point Nutrient Export by Subdrainage Area:
        Tributary                         kg P/km2/yr        kg N/km2/yr
        Snake River                            5                 97
        Wildhorse River                       20                331
* See Working Paper No. 175.

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                                     12
    E.  Yearly Loads:
            In the following table, the existing phosphorus loadings
        are compared to those proposed by Vollenweider (Vollenweider
        and Dillon, 1974).  Essentially, his "dangerous" loading is
        one at which the receiving water would become eutrophic or
        remain eutrophic; his "permissible" loading is that which
        would result in the receiving water remaining oligotrophic
        or becoming oligotrophic if morphometry permitted.   A meso-
        trophic loading would be considered one between "dangerous"
        and "permissible".
            Note that Vollenweider's model may not be applicable to
        water bodies with short hydraulic retention times.
                                   Total Phosphorus      Total Nitrogen
        	Total   Accumulated   Total   Accumulated
        grams/mVyr              183.51     25.37      3,265.1    loss*
        Vollenweider phosphorus loadings
         (g/m2/yr) based on mean depth and mean
         hydraulic retention time of Oxbow Reservoir:
            "Dangerous"  (eutrophic loading)             9.00
            "Permissible"  (oligotrophic loading)        4.50
* There was an apparent loss of nitrogen during the sampling year.   This
  may have been due to nitrogen fixation in the reservoir, solubilization
  of previously sedimented nitrogen, recharge with nitrogen-rich ground
  water, unsampled point sources discharging directly to the reservoir,
  or (probably) insufficient outlet sampling in relation to the very
  short hydraulic retention time of the reservoir.  Whatever the cause,
  a similar nitrogen loss has occurred at Shagawa Lake,  Minnesota,  which
  has been intensively studied by EPA's former National  Eutrophication and
  Lake Restoration Branch (Malueg et al., 1975).

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                                     13

V.  LITERATURE REVIEWED

    Malueg, Kenneth W., D.  Phillips Larsen, Donald W.  Schults,  and
        Howard T.  Mercier;  1975.   A six-year water, phosphorus, and
        nitrogen budget for Shagawa Lake, Minnesota.   Jour.  Environ.
        Qual., vol. 4, no.  2, pp.  236-242.

    Martin, R. A.  R.,  and Ronald L. Hanson, 1966.   Reservoirs  in the
        United States.  Water Supply Paper No.  1838,  U.S.  Geol. Surv.,
        Wash., DC.

    McHugh, Robert A., 1972.   Interim study of  some physical,  chemical,
        and biological properties  of selected Oregon  lakes.  OR Dept.
        of Environ. Qua!.,  Portland.

    Vollenweider,  R. A., and P.  J. Dillon,  1974.   The  application of
        the phosphorus loading concept to eutrophication research.
        Natl.  Res. Council  of Canada Publ.  No.  13690,  Canada Centre
        for Inland Waters,  Burlington, Ontario.

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VI.  APPENDICES
                                    14
                                   APPENDIX A
                                  LAKE RANKINGS

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  LAKE DATA TO BE USED IN BANKINGS

  LAKE
  CODE  LAKE NAME

  1601  AMERICAN FALLS RESERVOIR

  1603  CASCADE  LAKE

  1603  LAKE COEUR  D'ALENE

  1604  OWORSHAK  RESERVOIR

  1605  MAUSER

  1606   HAYOEN LAKE

  1607   ISLAND PARK RESERVOIR

  1608  LAKE LOWELL

  1609  MAGIC RESERVOIR

 I6lu  PALISADES RESERVOIR

 1611  LOWER PAYETTE

 1612  LOwfER TWIN LAKES

 1613  UPPER TWIN LAKES

 4101   8ROWNLEE  RESERVOIR

 4102   DIAMOND LAKE

 4103   HELLS CANYON RESERVOIR

 4104   HILLS CREEK  RESERVOIR

 4105   O'-VYHEE

 4106   OXBOW RESERVOIR

4107   SUTTLE LAKE

4108  WALDO LAKE
MEDIAN
TOTAL P
0.105
0.032
0.017
0.010
0.028
0.010
0.034
0.070
0.062
0.024
0.013
0.016
0.017
0.079
0.028
0.068
0.038
0.095
0.071
0.031
0.005
MEDIAN
INORG N
0.080
0.060
0.040
0.080
0.075
0.040
0.050
0.070
0.130
0.080
0.060
0.050
0.045
0.560
0.040
0.640
0.060
•0.425
0.690
0.04Q
0.040
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
428.133
294.500
429.111
435.200
480.417
425.555
95.000
-100.000
MEAN
CHLORA
15.379
8.081
10.391
2.420
11.112
2.787
9.322
25.389
7.322
2.067
4.600
2.318
34.962
16.207
7.300
18.722
2.333
3.350
10.311
9.167
0.350
15-
MIN DO
14.700
14.600
12.200
7.^00
14.800
11.800
12.800
14.600
14.700
12.800
9.600
13.600
8.200
14.500
6.800
12.400
7.400
13.200
12.200
6.800
6.800
MEu>I
OISS OKI
0.035
0.009
O.OOb
0.009
0.013
0.003
0.012
0.015
0.020
0.007
0.007
0.009
0.0 Of
0.0<+3
0.011
0.045
0.027
0.064
0.040
0.020
G.OG6

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PERCENT or LAKES WITH HIGHER VALUES  (NUMBER OF LAKES WITH HIGHER VALUES)
LAKE"
CODE  LAKE NAME
1601  AMERICAN FALLS RESERVOIR
1602  CASCADE LAKE
1603  LAKE COEUfi O'ALENE
1604  OWORSHAK RESERVOIR
1605  HAUSER
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
4ioi  BROWNLEE: RESERVOIR
4102  DIAMOND LAKE
4103  HELLS CANYON RESERVOIR
4104  KILLS CREEK RESERVOIR
410'5  OWYHEE
4106  OXBOW RESERVOIR
4107  SUTTLE LAKE
4108  WALOlPLAKE
MEDIAN
TOTAL P
0 ( 0) '
45 (
75 (
93 (
58 (
93 (
40 (
20 <
30 <
65 (
85 <
80 (
70 (
10 (
58 (
25 (
35 <
5 (
15 <
50 (
100 (
9)
15)
18)
ID
18)
8)
4)
6)
13)
17)
16)
14)
2)
11)
5)
7)
1)
3)
10)
20)
MEDIAN
INORG N
30 ( 5)
58 1
93 1
30 i
40 <
93 1
68 1
45 1
20 1
30 1
58 I
68 1
75 1
10 <
93 1
5 1
50 1
15 1
0 I
80 (
93 <
I 11)
; 17)
[ 5)
[ 8)
: 17)
! 13)
; 9)
! 4)
1 S)
I 11)
[ 13)
! 15)
I 2)
! 17)
[ 1)
I 10)
: 3)
; o)
[ 16)
! 17)
500-
MEAN SEC
10 ( 2)
35 (
55 <
40 (
70 (
85 (
50 (
5 (
45 (
75 (
90 (
60 (
65 (
25 (
80 <
20 (
15 (
0 (
30 (
95 (
100 (
7)
11)
8)
14)
17)
10)
1)
9)
15)
18)
12)
13)
5)
16)
4)
3)
0)
6)
19)
20)
MEAN
CHLORA
20 ( 4)
50
30
80
25
75
40
5
55
95
65
90
0
15
60
10
85
70
35
45
100
( 10)
( 6)
( 16)
( 5)
( 15)
< 8)
( 1)
< ID
< 19)
( 13)
( 18)
( 0)
( 3)
( 12)
( 2)
( 17)
( 14)
( 7)
( 9)
( 20)
15- MEDIAN
MIN 00 DISo OKTMO P
13 (2) 20 ( 4)
3 (
58 (
83 <
3 <
65 (
43 (
20 (
13 (
43 (
70 (
30 (
75 (
25 (
95 (
50 (
83 (
35 (
58 (
95 (
95 (
0)
11)
16)
0)
13)
8)
4)
2)
8)
14)
6)
15)
5)
18)
10)
16)
7)
ID
18)
18)
65 (
90 (
65 (
45 (
100 (
50 (
40 (
30 (
80 (
75 (
65 (
95 (
10 (
55 (
5 (
25 (
, 0 <
15 (
35 (
85 (
12)
18)
12)
9)
20)
10)
8)
6)
16)
15)
12)
19)
2)
11)
1)
5)
0)
3)
7)
17)
IND£X
NO
i
93 i
256
401
391
241
511
291
135
193
388
4-f3
393
380
*5
441
115
2*3
125
lo3
400
573

-------
LAKES RANKED BY INDEX NOS.
RANK  LAKE CODE  LAKE NAME
                                       INDEX  NO
 1   4103       WALDO  LAKE                 573
 2   1606       HAYOElM LAKE                511
 3   1611       LOWER  PAYETTE              443
 4   4102       DIAMOND LAKE               441
 5   1603       LAKE COEUR O'ALENE         401
 6   4107       SUTTLE LAKE                4CO
 7   1612       LOWER  TWIN LAKES           393
 s   1604       DW/ORSHAK RESERVOIR         391
 9   i6io       PALISADES RESERVOIR        388
10   1613       UPPER  TWIN LAKES           380
11   4104       HILLS  CREEK R£SERv6lR      293
12   1607       ISLAND PARK RESERVOIR      291
13   1602       CASCADE LAKE               ?56
14   1605       HAUSER                     241
15   1609       MAGIC  RESERVOIR            193
16   4106       OXBOW  RESERVOIR            153
17   1608       LAKE LOWELL                135
18   4105       OWYHEE  -                   125
19   4103       HELLS  CANYON RESERVOIR    '115
20   4101       8ROWNLEE RESERVOIR          95
21   1601       AMERICAN PALLS RESERVOIR    93

-------
    APPENDIX B





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 C
TRIBUTARY FLOW DATA

-------
                                   TRIdUTAkY FLOW  INFORMATION FOR OREGON
                                                                                           08/11/76
LAKE CODE 4106
                   ox BOW RESERVOIR
     TOTAL DRAINAGE AREA OF LAKE(SO KM)  188810.9


                                  FE8     MAR     APR
          SUB-DRAINAGE
TRIBUTARY  AREAfSQ KM)
                          JAN
                                                          MAY
                                         NORMALIZED FLOWS(CMS)
                                           JUN     JUL     AUG
   SEP
OCI
                   NOV
                           UEC
MEAN
4106A1
4106A2
4106H1
4106ZZ
          188810.9
          188033.9
             458.4
              89.1
597.V*  713.58  676.77  716.42  634.30  620.14  336.97  325.64  396.44   447.41   444.57   501.21  532.66
594.65 710.75 671.11 707.92
2.27 2.1> 5.10 6.51
0.42 0.51 0.68 0.79
614.48
15.57
2.41
600
15
1
.32
.57
.42
331.31
4.25
0.68
322.61
1.42
0.23
396.44
0.99
0.17
444.57
1.42
0.20
441
2
0
.74
.27
.23
498.38
1.42
0.23
526.27
4.92
0.66
SUMMARY
TOTAL DRAINAGE AREA OF LAKE =
SUM OF SUB-DRAINAGE AREAS =
188810
188581
.9
.4
TOTAL FLOW IN =
TOTAL FLOW OUT =
6401.
6410.
27
92



     MEAN MONTHLY FLOWS AND DAILY FLOWS(CMS)

TRIBUTARY   MONTH   YEAR    MEAN FLOW  DAY

4106A1
                                                   FLOW  DAY
                                              FLOW  DAY
FLOW
4106A2
10
11
1?
1
?
3
4
5
6
7
a
9
10
11
12
1
?
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
501.208
495.545
523.862
614.476
719.248
877.822
1268.595
1347.882
733.406
413.426
328.475
444.574
498.376
492.713
523.862
614.476
719.248
872.159
1260.100
1328.060
719.243
407.762
325.644
444.574
19
23
14
4
9
9
13
17
7

9
28
19
23
14
4
9
9
13
17
7

9
28
410.594
521.030
538.020
620.139 25
569.168 22
897.644
1155.327
82.119
744.733

311.485
430.416
410.594
521.030
538.020
617.307 25
569.168 22
889.149
1149.664
51.537
722.080

308.654
430.416



656.951
894.812










656.951
891.980








-------
                                   TRIBUTARY FLOW INFORMATION FOR OREGON
                                       08/11/76
LAKE CODE 4106     OX BOW RESERVOIR

     MEAN MONTHLY FLOWS AND DAILY FLOWS(CMS)

TRIBUTARY   MONTH   YEAR    MEAN FLOW  DAY

4106B1
10
11
12
1
?
3
4
5
6
7
8
9
74
74
74
75
75
75
75
75
75
75
75
75
FLOW  DAY
0.850
0.566
0.623
0.708
1.416
5.360
5.947
17.556
12.743
4.531
1.076
0.793
19
23
14
4
9
9
13
17
7

9
28
0.906
0.623
0.623
0.623
0.991
8.495
5.663
25.485
18.406

0.708
0.566



25
22







                  FLOW  DAY
                                                                    0.850
                                                                    1.189
                                    FLOW

-------
        APPENDIX D





PHYSICAL and CHEMICAL DATA

-------
STORET RETRIEVAL DATE 76/08/12
                                                                  410^01
                                                                 44 58 07.0 116 50 02.0 3
                                                                 OXBOW RESERVOIR
                                                                 41001   OREGON
                                                                                          130892
11EPALES 2111202
0064 FEET DEPTH CLASS 00
DATE
FROM
TO
75/04/09
75/08/04
75/09/15

DATE
FROM
TO
75/04/09



75/08/0*.





75/09/15





TIME DEPTH
OF
DAY FEET
10 00 0000
10 00 0005
10 00 0015
10 00 0035
10 00 0060
09 00 0000
09 00 0005
09 00 0015
09 00 0035
09 00 0070
09 00 0096
15 00 0000
15 00 0005
15 00 0015
15 00 0035
15 00 0065
15 00 0096

TIME DEPTH
OF
DAY FEET
10 00 0000
10 00 0005
10 00 0015
10 00 0035
10 00 0060
09 00 0000
09 00 0005
09 00 0015
09 00 0035
09 00 0070
09 00 0096
15 00 0000
15 00 0005
15 00 0015
15 00 0035
15 00 0065
15 00 0096
00010
WATER
TEMP
CENT
6.9
7.1
7.1
7.0
7.0
23.9
22.2
21.1
20.6
20.0
19.2
21.6
21.0
21.0
20.9
20.9
20.9
00665
PHOS-TOT

MG/L P
0.087
0.084
0.074
0.079
0.079
0.036
0.040
0.040
0.042
0.051
0.055
0.073
0.069
0.071
0.072
0.096
0.085
00300 00077 00094
00 TRANSP CNDUCTVY
SECCHI FIELD
MG/L INCHES MICROMHO
15.4 27
15.6
15.2
15.6
15.4
9.2 126
7.6
5.6
6.0
4.8
5.8
5.6 96
8.6
4.5
4.2
4.3
4.0
32217 00031
CHLRPHYL INCDT LT
A REMNING
UG/L PERCENT
13.3



8.7





7.1





247
239
239
240
243
281
275
269
265
249
241
426
419
417
417
417
420




00400
PH
SU
8.
8.
8.
8.
8.
a.
8.
8.
8.
8.
8.
8.
8.
8.
8.
8.
8.




SO
45
40
45
45
90
70
40
35
15
65
20
10
10
10
10
10




00410 00610 00625 00630 00671
T ALK NH3-N TOT KJEL N02&N03 PHOS-DIS
CAC03 TOTAL N N-TOTAL ORTHO
MG/L MG/L MG/L MG/L MG/L P
132
131
130
129
129
101
102
102
101
97
96
167
166
165
165
166
166




0.050
0.040
0.050
0.040
0.050
0.020
0.030
0.030
0.020
0.030
0.030
0.020K
0.020K
0.020K
0.020K
0.070
0.020K




0.400
0.400
0.400
0.400
0.400
0.300
0.300
0.300
0.200
0.200
0.300
0.200
0.200
0.200
0.200
0.500
0.200




0.650
0.640
0.640
0.640
0.640
0.160
0.240
0.280
0.300
0.320
0.350
0.690
0.700
0.700
0.710
0.710
0.710




0.033
0.037
0.042
0.039
0.040
0.012
0.019
0.027
0.029
0.034
0.037
0.067
0.065
0.066
0.066
0.066
0.067




K VALUE KNOWN TO BE
LESS THAN INDICATED

























































































































-------
STORE! RETRIEVAL DATE 76/08/12
                                                                   410602
                                                                  44 56 10.0 116 49 58.0 3
                                                                  OXttOw RESERVOIR
                                                                  41001   OREGON
                                                                                           130892
11EPALES
2111202
0094 FEET DEPTH CLASS 00

DATE
FROM
TO
75/04/09




75/08/04






75/09/15






DATE
FROM
TO

TIME DEPTH
OF
DAY FEET
10 25 0000
10 25 0005
10 25 0015
10 25 0050
10 25 0090
09 30 0000
09 30 0005
09 30 0015
09 30 0030
09 30 0060
09 30 0090
09 30 0114
15 20 0000
15 20 0005
15 20 0015
15 20 0035
15 20 0070
15 20 0101

TIME DEPTH
OF
DAY FEET
00010
WATER
TEMP
CENT
7.2
7.5
7.5
7.4
7.4
21.7
21.7
21.0
20.8
19.9
19.5
19.5
21.8
21.5
21.3
21.1
21.1
21.1
00665
PHOS-TOT

MG/L P
00300
DO

MG/L
15.6
15.6
15.6
15.4
15.6

8.0
4.4

3.0
2.8
7.0
5.3
5.2
5.1
4.9
4.6
4.5
32217
CHLRPHYL
A
UG/L
00077 00094
TRANSP CNDUCTVY
SECCHI FIELD
INCHES MICROMHO
30 239
239
238
239
239
126 273
275
270
265
257
247
247
96 423
423
419
418
418
419
00031
INCDT LT
REMNING
PERCENT
00400
PH

SU
8.
8.
8.
8.
8.
a.
8.
8.
8.
8.
8.
8.
8.
8.
8.
8.
8.
8.







50
50
50
45
45
60
60
40
35
20
10
55
20
20
20
10
10
00




00410
T ALK
CAC03
MG/L
129
130
129
134
132
101
101
100
97
99
99
101
165
166
169
169
171
154




00610
00625
NH3-N TOT KJEL
TOTAL
Mii/L
0.060
0.050
0.060
0.060
0.050
0.030
0.040
0.040
0.030
0.030
0.020
0.030
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K




N
MG/L
0.300
0.400
0.400
0.300
0.400
0.300
0.300
0.200K
0.200
0.200
0.200
0.200
0.200
0.200
0.200
0.300
0.300
0.400




00630
N02&N03
N-TOTAL
MG/L
0.650
0.640
0.650
0.660
0.650
0.280
0.270
0.300
0.330
0.330
0.340
0.300
0.690
0.690
0.690
0.670
0.690
0.690




00671
PHOS-DIS
OHTHO
MG/L P
0.041
0.044
0.051
0.033
0.028
0.034
0.037
0.039
0.036
0.035
0.035
0.030
0.063
0.063
0.063
0.064
0.065
0.067




K VALUF KNOWN TO BF
75/04/09




75/08/04






75/09/15





10 25 0000
10 25 0005
10 25 0015
10 25 0050
10 25 0090
09 30 0000
09 30 0005
09 30 0015
09 30 0030
09 30 0060
09 30 0090
09 30 0114
15 20 0000
15 20 0005
15 20 0015
15 20 0035
15 20 0070
15 20 0101
0.081
0.082
0.085
0.081
0.081
0.042
0.043
0.041
0.055
0.051
0.051
0.057
0.071
0.073
0.076
0.074
0.078
0.085
23.0




5.0






8.5



























































LESS THAN

















INDICATED








































































-------
STORET RETRIEVAL DATE 76/08/12
DATE
FROM
TO
75/04/09


75/08/04


75/09/15



TIME
OF
DAY
11 00
11 00
11 00
10 05
10 05
10 05
16 40
16 40
16 40
16 40
DEPTH

FEET
0000
0005
0015
0000
0005
0013
0000
0005
0017
0041
tfATER
TEMP
CENT
7.5
7.6
7.4
17.7
17.8
17.8
21.2
21.2
21.2
21.2
                                                                  410603
                                                                44  51  23.0  116 53  25.0  3
                                                                OXBOW  RESERVOIR
                                                                41001   OREGON
                                                                                          130892
                                                                 11EPALES              2111202
                                                                  0019  FEET   DEPTH   CLASS  00
00010
ATER
TEMP
CENT
7.5
7.6
7.4
17.7
17.8
17.8
21.2
21.2
21.2
21.2
00300
DO

MG/L
15.6
15.2
15.2
8.8
5.4
5.8
4.6
4.6
4.6
4.5
00077
TRANSP
SECCHI
INCHES
20


17


132



00094
CNDUCTVY
FIELD
M1CROMHO
237
237
238
233
235
233
420
420
421
419
00400
PH

SU
8.45
8.45
8.50
8.55
8.20
8.10
8.15
8.20
8.20
8.10
00410
T ALK
CAC03
MG/L
131
132
132
102
97
95
153
154
151
151
00610
NH3-N
TOTAL
MG/L
0.050
0.060
0.050
0.020
0.020
0.020
0.020K
0.020K
0.020K
0.020K
00625
TOT KJEL
N
MG/L
0.500
0.300
0.400
0.300
0.300
0.200
0.300
0.300
0.300
0.300
00630
N02«*N03
N-TOTAL
MG/L
0.650
0.640
0.640
0.280
0.360
0.360
0.680
0.680
0.680
0.680
00671
PHOS-OIS
ORTHO
MG/L P
0.024
0.029
0.026
0.025
0.042
0.043
0.063
0.063
0.064
0.063

DATE
FROM
TO
75/04/09


75/08/04


75/09/15




TIMF DEPTH
OF
DAY FEET
11 00 0000
11 00 0005
11 00 0015
10 05 0000
10 05 0005
10 05 0013
16 40 0000
16 40 0005
16 40 0017
16 40 0041
00665
PHOS-TOT

MG/L P
0.076
0.075
0.079
0.049
0.053
0.056
0.068
0.065
0.065
0.067
32217
CHLRPHYL
A
UG/L
17.7


3.4


6.1



00031
INCDT LT
REMNING
PERCENT










            K  VALUE KNOWN  TO BE
            LESS THAN INDICATED

-------
  APPENDIX E
TRIBUTARY DATA

-------
STOfiET RETRIEVAL DATE 76/08/12
  DATE   TIME DEPTH N02&N03
  FROM    OF
   TO    DAY  FEET

74/10/19 12 50
74/11/23 12 30
75/01/25 14 22
75/02/09 14 50
75/02/22 15 35
75/05/17 14 00
75/06/07 13 00
75/08/09
75/09/28 11 00
                                                                  4106A1
                                                                 44 58  30.0  116  51  15.0  4
                                                                 SNAKE  RIVER
                                                                 41       15  COPPERFIELO
                                                                 0/OX BOW  RESERVOIR       130892
                                                                 BRDG BELOW  OXBOW POWERHOUSE
                                                                 11EPALES              2111204
                                                                  0000  FEET   DEPTH   CLASS  00
0630
I&N03
OTAL
IG/L
0.800
0.960
0.810
0.750
0.720
0.070
0.055
0.300
0.620
00625
TOT KJEL
N
MG/L
1.400
0.400
0.500
1.100
0.400
0.750
1.300
1.850
0.500
00610
NH3-N
TOTAL
MG/L
0.055
0.035
0.056
0.072
0.044
0.030
0.030
0.050
0.025
00671
PHOS-DIS
ORTHO
MG/L P
0.065
0.050
0.016
0.024
0.016
0.010
0.010
0.030
0.050
00665
PHOS-TOT

MG/L P
0.075
0.050
0.030
0.050
0.040
0.090
0.060
0.060
0.070

-------
STORET RETRIEVAL OA1E 7b/6s/i3
  DATE   TIME DEPTH N02&N03
  FROM    OF
   TO    DAY  FEET
74/10/19
74/11/33
74/13/14
75/02/09
75/02/22
75/03/09
75/04/13
75/05/17
75/06/07
75/09/28
14 30
12 00
13 30
11 15
12 00
12 00
10 55
11 35
12 25
                                                                  4106A2
                                                                 44 50 45.0 116 53 45.0 4
                                                                 SNAKE RIVER
                                                                 41      15 COPPERFIELD
                                                                 T/OX BOW RESERVOIR       130892
                                                                 PVD HWY BRDG .4 MI N OF BROKNLEE 0AM
                                                                 11EPALES             2111204
                                                                  0000 FEET  DEPTH  CLASS 00
0630
&N03
OTAL
IG/L
0,800
0.950
0.990
0.760
0.720
0.825
0.500
0.060
0.050
0.640
00625
TOT KJEL
N
MG/L
0.600
0.400
0.700
0.600
0.400
1.100
1.850
1.630
0*550
1.000
00610
NH3-N
TOTAL
MG/L
0.065
0.075
0.060
0.056
0.056
0.044
0.055
0.045
0.040
0.045
00671
PHOS-DIS
ORTHO
MG/L P
0.060
0.045
0.045
0.016
0.016
0.024
0.020
0.015
0.010
0.060
00665
PHOS-TOT

MG/L P
0.070
0.045
0.050
0.050
0.040
0.070
0.080
0.080
0.050
0.090

-------
STORET RETRIEVAL DATE 76/08/12
  DATE   TIME DEPTH N02&N03
  FROM    OF
   TO    DAY  FEET
74/10/19
74/11/23
74/12/14
75/01/04
75/01/25
75/02/09
75/02/22
75/03/09
75/04/13
75/05/17
75/06/07
75/09/28
14 15
11 45
13 06
11 00
10 55
11 00
12 05
12 04
10 45
11 30
12 20
                                                                 410681
                                                                44 51 15.0 116 53 30.0 4
                                                                WlLDHORSE RIVER
                                                                41       15 COPPERFIELD
                                                                T/OX BOW RESERVOIR        130892
                                                                BRDG .4  MI N OF ADAMS/WASH  CO  LINE
                                                                11EPALES              2111204
                                                                 0000 FEET  DEPTH   CLASS  00
0630
&N03
OTAL
IG/L
0.040
0.016
0.056
0.096
0.088
0.152
0.232
0.297
0.105
0.070
o.oao
0.045
00625
TOT KJEL
N
MG/L
0.600
0.200
0.300
0.700
0.700
0.600
0.100
0.700
1.050
0.850
1.050
0.600
00610
NH3-N
TOTAL
MG/L
0.025
0.030
0.010
0.020
0.016
0.040
0.012
0.032
0.020
0.080
0.015
0.015
00671
PHOS-DIS
ORTHO
MG/L P
0.015
0.015
0.015
0.028
0.016
0.016
0.016
0.024
0.025
0.025
0.015
0.010
00665
PHOS-TOT

MG/L P
0.020
0.020
0.020
0.040
0.020
0.030
0.020
0.070
0.080

0.050
0.050

-------