10343500  SAGEHEN CREEK NEAR TRUCKEE, CA
                                         (Hydrologic Benchmark Station)

LOCATION.--Lat 39°25'54", long 120°14'13", in NE 1/4 NE 1/4 sec.7, T.18 N., R.16 E., Nevada County, Hydrologic
   Unit 16050102, on left bank 2.2 mi upstream from bridge on State Highway 89 and 7.5 mi north of Truckee.

DRAINAGE AREA.--10.5 mi2.
                                             WATER-DISCHARGE RECORDS

PERIOD OF RECORD.--October 1953 to current year.

REVISED RECORDS.--WDR CA-79-3:  Drainage area.

GAGE.--Water-stage recorder and concrete control.  Elevation of gage is 6,320 ft above sea level, from
   topographic map.  Prior to Dec. 2, 1953, nonrecording gage at site 100 ft upstream at different datum.

REMARKS.--Records excellent.  No storage or diversion upstream from station.  See schematic diagram of Truckee
   River basin.

EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 765 ft3/s, Feb. 1, 1963, gage height, 4.64 ft, from
   floodmarks, from rating curve extended above 160 ft3/s on basis of slope-area measurement at gage height
   4.28 ft; minimum, 0.6 ft3/s, Aug. 8, 1960, Aug. 7, 1961, result of temporary regulation.

EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 50 ft3/s or maximum:

                       Discharge       Gage height                                Discharge       Gage height
 Date       Time        (ft3/s)            (ft)              Date       Time       (ft3/s)            (ft)

Dec. 12     1000          122              3.24             Apr. 16     1430          68              2.87
Feb.  5     0430           74              2.92             May  16     0500         435              4.18


                  DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1995 TO SEPTEMBER 1996
                                               DAILY MEAN VALUES

DAY       OCT      NOV      DEC      JAN      FEB      MAR      APR      MAY      JUN      JUL      AUG      SEP

  1       2.8      3.1      4.2      5.4      4.4      9.7       25       69       40     10        3.7      2.5
  2       2.8      3.1      4.6      4.9      4.3      9.7       25       72       39      9.4      3.7      2.5
  3       2.8      3.2      3.8      5.0      4.3     10         22       69       38      8.9      3.8      2.5
  4       2.8      3.2      5.3      4.7     31       10         22       64       38      8.6      3.8      2.5
  5       2.9      3.2      4.4      4.5     61        9.3       25       62       38      8.2      3.7      2.5

  6       2.8      3.2      3.9      4.4     33       e9.0       29       61       37      7.8      3.6      2.6
  7       2.8      3.2      3.7      4.3     23        8.7       34       60       36      7.5      3.5      2.6
  8       2.8      3.2      3.6      4.2     20        9.0       38       57       35      7.3      3.4      2.6
  9       2.9      3.2      3.5      4.3     18        9.5       46       55       33      7.0      3.3      2.5
 10       2.9      3.2      3.5      4.3     17        9.9       43       54       30      6.7      3.3      2.5

 11       2.9      3.2     11        4.0     16       10         42       57       28      6.6      3.3      2.5
 12       2.9      3.2     71        3.9     15        9.7       39       61       27      6.7      4.0      2.5
 13       3.0      3.3     14        3.9     14        9.1       36       66       26      9.0      3.7      3.0
 14       3.0      3.3      8.5      3.8     14        9.0       39       75       24      7.7      3.6      3.0
 15       2.9      3.3      6.9      4.9     14        9.6       45      106       22      6.8      3.4      3.5

 16       3.0      3.3      6.1     13       19       10         60      263       21      6.3      3.2      5.7
 17       3.0      3.1      5.3      9.5     28       11         43      245       19      6.0      3.1      3.7
 18       3.0      3.1      5.0      6.9     23       13         37      241       18      5.7      3.1      3.3
 19       3.0      3.2      4.7      6.3     23       15         33      152       17      5.6      3.1      3.1
 20       3.0      3.2      4.4      5.9     20       17         30      120       16      5.4      3.0      3.0

 21       2.9      3.1      4.2     e5.8     16       19         28      106       15      5.1      3.0      2.9
 22       3.0      3.1      4.3      5.3     14       19         28       91       14      4.9      3.0      2.8
 23       3.0      3.1      4.1      5.3    e14       16         35       76       13      4.6      2.8      2.8
 24       3.0      3.1      4.1      4.6     13       15         50       67       13      4.6      2.8      2.8
 25       3.1      4.1      3.9      5.3     12       14         54       61       14      4.4      2.8      2.8

 26       3.1      5.3      3.8      5.0    e12       14         58       57       15      4.4      2.7      2.8
 27       3.1      3.6      3.8      4.6     11       16         59       55       14      4.2      2.7      2.8
 28       3.1      3.6      3.8      4.7     11       18         55       50       13      4.6      2.7      2.8
 29       3.0      3.5      3.9      4.5     10       16         57       47       12      4.4      2.6      2.8
 30       3.1      3.5      6.3      4.5      ---     16         64       44       11      4.1      2.6      2.7
 31       3.1      ---      7.2      4.5      ---     17        ---       42      ---      3.9      2.5      ---

TOTAL    91.5    100.0    226.8    162.2    515.0    388.2     1201     2705      716    196.4     99.5     86.6
MEAN     2.95     3.33     7.32     5.23     17.8     12.5     40.0     87.3     23.9     6.34     3.21     2.89
MAX       3.1      5.3       71       13       61       19       64      263       40       10      4.0      5.7
MIN       2.8      3.1      3.5      3.8      4.3      8.7       22       42       11      3.9      2.5      2.5
AC-FT     181      198      450      322     1020      770     2380     5370     1420      390      197      172

  e Estimated.


                               10343500  SAGEHEN CREEK NEAR TRUCKEE, CA--Continued

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1954 - 1996, BY WATER YEAR (WY)

          OCT      NOV      DEC      JAN      FEB      MAR      APR      MAY      JUN      JUL      AUG      SEP

MEAN     3.45     5.07     7.11     7.07     8.33     10.6     24.1     43.7     25.3     7.28     3.11     2.69
MAX      11.9     27.7     44.0     33.8     51.0     50.1     51.6      117      142     37.4     11.8     7.56
(WY)     1963     1984     1965     1970     1963     1986     1986     1969     1983     1983     1983     1983
MIN      1.46     1.83     2.03     1.81     2.54     2.74     6.13     3.45     1.82     1.36     1.20     1.11
(WY)     1995     1993     1977     1962     1994     1962     1975     1988     1992     1994     1994     1960

SUMMARY STATISTICS           FOR 1995 CALENDAR YEAR        FOR 1996 WATER YEAR           WATER YEARS 1954 - 1996

ANNUAL TOTAL                        8639.5                     6488.2
ANNUAL MEAN                           23.7                       17.7                       12.3
HIGHEST ANNUAL MEAN                                                                         30.0            1983
LOWEST ANNUAL MEAN                                                                           2.65           1977
HIGHEST DAILY MEAN                   175     May  1             263     May 16             398       Dec 23 1955
LOWEST DAILY MEAN                      2.1   Jan  1               2.5   Aug 31               1.0     Sep 13 1960
ANNUAL SEVEN-DAY MINIMUM               2.4   Jan  1               2.5   Aug 30               1.1     Sep  9 1960
INSTANTANEOUS PEAK FLOW                                         435     May 16             765       Feb  1 1963
INSTANTANEOUS PEAK STAGE                                          4.18  May 16               4.64    Feb  1 1963
ANNUAL RUNOFF (AC-FT)              17140                      12870                       8930
10 PERCENT EXCEEDS                    73                         51                         32
50 PERCENT EXCEEDS                     6.7                        5.4                        4.4
90 PERCENT EXCEEDS                     2.8                        2.8                        1.9

                               10343500  SAGEHEN CREEK NEAR TRUCKEE, CA--Continued

                                              PRECIPITATION RECORDS

PERIOD OF RECORD.--December 1990 to September 1996 (discontinued).

INSTRUMENTATION.--Recording-weighing gage since Dec. 1, 1990.

REMARKS.--Feb. 24-26, 1996, precipitation data provided by Sagehen Creek Research Station.

EXTREMES FOR PERIOD OF RECORD.--Maximum recorded daily precipitation, 3.36 in., Mar. 4, 1991; no precipitation
   for many days in each year.

EXTREMES FOR CURRENT YEAR.--Maximum recorded daily precipitation, 2.95 in., Feb. 4; no precipitation for many
   days.


                    PRECIPITATION, TOTAL (INCHES), WATER YEAR OCTOBER 1995 TO SEPTEMBER 1996
                                                DAILY SUM VALUES

DAY       OCT      NOV      DEC      JAN      FEB      MAR      APR      MAY      JUN      JUL      AUG      SEP

  1       .00      .00      .10      .03      .04      .07      .64      .00      .00      .00      .00      .00
  2       .00      .00      .18      .00      .03      .00      .03      .00      .00      .00      .03      .04
  3       .00      .00      .00      .00      .00      .00      .00      .00      .00      .00      .00      .00
  4       .03      .03      .07      .00     2.95     1.07      .03      .00      .00      .00      .03      .00
  5       .03      .00      .04      .00      .26      .78      .04      .00      .00      .00      .00      .04

  6       .00      .00      .03      .00      .03      .08      .00      .00      .00      .00      .00      .00
  7       .00      .00      .00      .00      .00      .00      .00      .00      .00      .00      .00      .00
  8       .00      .00      .03      .00      .00      .00      .00      .00      .00      .00      .00      .00
  9       .00      .00      .00      .00      .00      .00      .00      .03      .00      .00      .00      .00
 10       .00      .00      .00      .00      .00      .00      .00      .00      .00      .00      .00      .00

 11       .00      .00      .03      .03      .03      .34      .00      .00      .00      .00      .00      .00
 12       .00      .00     1.30      .00      .00      .20      .00      .00      .00      .00      .00      .00
 13       .00      .00     2.58      .00      .00      .00      .03      .00      .00      .00      .00      .00
 14       .00      .00      .29      .00      .00      .07      .00      .03      .00      .00      .00      .00
 15       .00      .00      .07      .26      .00      .03      .00      .90      .00      .00      .00      .16

 16       .00      .00      .38     1.12      .11      .00      .88     1.66      .00      .07      .00      .20
 17       .00      .00      .04      .13      .57      .00      .40     1.21      .00      .00      .07      .04
 18       .00      .00      .07      .78      .58      .00      .17      .35      .00      .00      .00      .00
 19       .00      .00      .00      .23     1.57      .00      .20      .03      .00      .10      .00      .00
 20       .00      .00      .00      .36      .62      .03      .07      .00      .00      .00      .03      .00

 21       .00      .00      .00      .56     1.28      .00      .00      .00      .00      .00      .03      .00
 22       .00      .00      .00      .20      .11      .29      .00      .07      .00      .00      .00      .00
 23       .00      .00      .03      .05      .11      .07      .00      .05      .00      .04      .00      .00
 24       .04      .00      .06     1.58     1.10      .04      .07      .00      .00      .03      .07      .00
 25       .00      .25      .04      .17      .27      .00      .07      .00      .00      .04      .08      .00

 26       .00      .14      .00      .07      .07      .03      .00      .00      .00      .00      .00      .00
 27       .00      .03      .00      .26      .11      .27      .03      .00      .00      .00      .10      .00
 28       .00      .00      .00      .85      .00      .43      .00      .00      .00      .00      .00      .00
 29       .00      .00      .00      .56      .00      .04      .00      .00      .00      .00      .00      .00
 30       .00      .00      .00      .15      ---      .00      .00      .03      .00      .00      .00      .33
 31       .00      ---      .00      .14      ---      .00      ---      .00      ---      .04      .00      ---

TOTAL    0.10     0.45     5.34     7.53     9.84     3.84     2.66     4.36     0.00     0.32     0.44     0.81

                                10343500  SAGEHEN CREEK NEAR TRUCKEE, CA--Continued

                                               WATER-QUALITY RECORDS

PERIOD OF RECORD.--Water years 1968-75, 1981 to September 1996 (discontinued).
  CHEMICAL DATA:  Water years 1968-72, October 1985 to September 1996 (discontinued).
  WATER TEMPERATURE:  Water years 1970-74.
  SEDIMENT DATA:  Water years 1968-75, 1981 to September 1996 (discontinued).

PERIOD OF DAILY RECORD.--
  WATER TEMPERATURE:  October 1969 to September 1974.


                           WATER-QUALITY DATA, WATER YEAR OCTOBER 1995 TO SEPTEMBER 1996

                    DIS-              PH                        BARO-            OXYGEN,   COLI-    STREP-
                  CHARGE,   SPE-     WATER                      METRIC             DIS-    FORM,   TOCOCCI   HARD-
                   INST.    CIFIC    WHOLE                      PRES-             SOLVED   FECAL,   FECAL,   NESS
                   CUBIC    CON-     FIELD   TEMPER-    TUR-     SURE   OXYGEN,   (PER-    0.7     KF AGAR   TOTAL
                    FEET    DUCT-   (STAND-   ATURE     BID-     (MM      DIS-     CENT    UM-MF   (COLS.    (MG/L
 DATE      TIME     PER     ANCE      ARD     WATER     ITY       OF     SOLVED   SATUR-  (COLS./    PER      AS
                   SECOND  (US/CM)   UNITS)  (DEG C)   (NTU)     HG)     (MG/L)   ATION)  100 ML)  100 ML)   CACO3)

NOV 1995
  07...    1155      3.2       118      7.8      4.0     0.70      610     10.6      101       <1       <1       47
AUG 1996
  06...    1105      4.0       113      8.2      9.0     0.40      608      9.2      100       33       27       47


          HARD-                                                         BICAR-    CAR-     ALKA-
          NESS              MAGNE-                     SODIUM   POTAS-  BONATE   BONATE   LINITY             CHLO-
         NONCARB  CALCIUM    SIUM,  SODIUM,              AD-     SIUM,   WATER    WATER   WAT DIS  SULFATE   RIDE,
         DISSOLV   DIS-      DIS-    DIS-              SORP-     DIS-   DIS IT   DIS IT   TOT IT    DIS-     DIS-
         FLD. AS   SOLVED   SOLVED  SOLVED              TION    SOLVED   FIELD    FIELD    FIELD    SOLVED   SOLVED
 DATE     CACO3    (MG/L    (MG/L    (MG/L    SODIUM   RATIO    (MG/L   MG/L AS  MG/L AS  MG/L AS   (MG/L    (MG/L
         (MG/L)    AS CA)   AS MG)   AS NA)  PERCENT            AS K)    HCO3      CO3     CACO3   AS SO4)   AS CL)

NOV 1995
  07...        0   12        4.2      5.4         19      0.3     2.1        73        0       60    <0.10     0.40
AUG 1996
  06...        0   12        4.0      4.6         17      0.3     1.7        69        0       56    <0.10     0.10


                           SOLIDS,   NITRO-   NITRO-   NITRO-   NITRO-                     PHOS-
          FLUO-   SILICA,  RESIDUE    GEN,     GEN,     GEN,   GEN,AM-            PHOS-   PHORUS    ALUM-
          RIDE,    DIS-    AT 180   NITRITE  NO2+NO3  AMMONIA  MONIA +   PHOS-   PHORUS    ORTHO,   INUM,   BARIUM,
           DIS-    SOLVED   DEG. C    DIS-     DIS-     DIS-   ORGANIC  PHORUS     DIS-    DIS-      DIS-    DIS-
          SOLVED   (MG/L     DIS-    SOLVED   SOLVED   SOLVED   TOTAL    TOTAL    SOLVED  SOLVED    SOLVED  SOLVED
 DATE     (MG/L     AS      SOLVED   (MG/L    (MG/L    (MG/L    (MG/L    (MG/L    (MG/L   (MG/L     (UG/L    (UG/L
          AS F)    SIO2)    (MG/L)   AS N)    AS N)    AS N)    AS N)    AS P)    AS P)   AS P)     AS AL)   AS BA)

NOV 1995
  07...    <0.10   29           93   <0.001    0.006   <0.002    <0.20    0.011    0.010    0.007    20       22
AUG 1996
  06...    <0.10   28           90    0.001    0.011   <0.002    <0.20    0.012    0.010    0.006    13       22


                                                                                                    RADIUM
                                     MANGA-   MOLYB-            SELE-             STRON-   VANA-     226,   URANIUM
         COBALT,   IRON,   LITHIUM   NESE,    DENUM,  NICKEL,   NIUM,   SILVER,    TIUM,   DIUM,     DIS-   NATURAL
          DIS-      DIS-     DIS-     DIS-     DIS-    DIS-      DIS-     DIS-     DIS-     DIS-   SOLVED,    DIS-
         SOLVED    SOLVED   SOLVED   SOLVED   SOLVED   SOLVED   SOLVED   SOLVED   SOLVED   SOLVED   RADON    SOLVED
 DATE     (UG/L    (UG/L    (UG/L    (UG/L    (UG/L    (UG/L    (UG/L    (UG/L    (UG/L    (UG/L    METHOD   (UG/L
          AS CO)   AS FE)   AS LI)   AS MN)   AS MO)   AS NI)   AS SE)   AS AG)   AS SR)   AS V)   (PCI/L)   AS U)

NOV 1995
  07...    <3.0      54         <4     3.0    <10       <1.0        <1    <1.0    140          <6     --       --
AUG 1996
  06...    <3.0      67         <4     4.0    <10       <1.0        <1    <1.0    140          <6     0.03     0.26


                                10343500  SAGEHEN CREEK NEAR TRUCKEE, CA--Continued

                            SUSPENDED-SEDIMENT DISCHARGE, OCTOBER 1995 TO SEPTEMBER 1996


                                                   DIS-                      SEDI-
                                                 CHARGE,                     MENT,
                                                  INST.             SEDI-     DIS-
                                                  CUBIC   TEMPER-   MENT,   CHARGE,
                                                   FEET    ATURE    SUS-      SUS-
                                DATE      TIME     PER     WATER    PENDED   PENDED
                                                  SECOND  (DEG C)   (MG/L)  (T/DAY)

                            NOV 1995
                              07...       1155      3.2       4.0        2     0.02
                            AUG 1996
                              06...       1105      4.0       9.0        4     0.04