10336790  TROUT CREEK AT SOUTH LAKE TAHOE, CA

LOCATION.--Lat 38°55'56", long 119°58'40", in SE 1/4 NW 1/4 sec.3, T.12 N., R.18 E., El Dorado County, Hydrologic
   Unit 16050101, near center of bridge span on downstream side of U.S. Highway 50 bridge, 1.2 mi upstream from
   Lake Tahoe, and 1.9 mi northeast of South Lake Tahoe Post Office.

PERIOD OF RECORD.--Water years 1972-74, 1989 to current year.

PERIOD OF DAILY RECORD.--
  WATER TEMPERATURE:  October 1971 to June 1974, October 1988 to September 1992.
  SUSPENDED-SEDIMENT DISCHARGE:  October 1971 to June 1974, October 1988 to September 1992.

REMARKS.--In October 1992, station was incorporated into the expanded Lake Tahoe Interagency Monitoring Program
   to monitor tributary contributions of nutrients and sediment to Lake Tahoe.  These data are reviewed and
   provided by the Nevada District Office, U.S. Geological Survey.  See schematic diagram of Truckee River basin.


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

                                  DIS-              PH                        BARO-            OXYGEN,   NITRO-
                                CHARGE,   SPE-     WATER                      METRIC             DIS-     GEN,
                                 INST.    CIFIC    WHOLE                      PRES-             SOLVED  NO2+NO3
                                 CUBIC    CON-     FIELD   TEMPER-  TEMPER-    SURE   OXYGEN,   (PER-     DIS-
                                  FEET    DUCT-   (STAND-   ATURE    ATURE     (MM      DIS-     CENT    SOLVED
               DATE      TIME     PER     ANCE      ARD      AIR     WATER      OF     SOLVED   SATUR-   (MG/L
                                 SECOND  (US/CM)   UNITS)  (DEG C)  (DEG C)    HG)     (MG/L)   ATION)   AS N)
                                (00061)  (00095)  (00400)  (00020)  (00010)  (00025)  (00300)  (00301)  (00631)

           OCT
             12...       0900     27          44      7.7     10.5      5.5      605      9.8       98    0.002
           NOV
             21...       1010     19          49     --       11.0      4.0     --       --       --      0.007
           DEC
             11...       1310     34          49     --        4.0      3.0     --       --       --      0.023
             12...       1200    127          40     --        4.0      3.0     --       --       --      0.019
             14...       1130     34          47     --        3.0      2.0     --       --       --      0.017
           JAN
             12...       0950     19          48     --        3.0      1.0     --       --       --      0.016
             16...       1230     49          46     --        3.5      2.0     --       --       --      0.019
             17...       1300     38          48     --        2.0      2.0     --       --       --      0.018
           FEB
             04...       1350     49          49     --        4.5      0.5     --       --       --      0.027
             05...       1400     99          41     --        6.0      0.5     --       --       --      0.018
             09...       1240     49          51     --        7.5      3.0     --       --       --      0.009
           MAR
             08...       0935     46          54      7.4      4.0      1.0      609     11.0       97    0.016
             20...       0930     56          52     --        6.0      2.0     --       --       --      0.015
           APR
             04...       0955     53          51     --        6.0      2.5     --       --       --      0.015
             12...       1610     73          45      7.5      4.0      6.0      602      9.7       99    0.006
             16...       1515    132          43     --        4.5      4.0     --       --       --      0.011
             17...       0945     91          43     --        2.5      1.5     --       --       --      0.007
             25...       1205     91          42     --       12.0      5.0     --       --       --      0.004
           MAY
             02...       0720    135          34     --       10.0      3.5     --       --       --      0.008
             06...       1815    123          35     --       13.0      7.0     --       --       --      0.008
             11...       1115    135          33     --       15.0      6.0     --       --       --      0.008
             14...       0720    178          29      7.8     11.0      5.5     --       --       --      0.008
             16...       1320    305          28     --        8.5      8.0     --       --       --      0.011
             18...       1340    232          28     --        7.0      7.0     --       --       --      0.004
             21...       1100    154          30      7.6      9.0      5.0     --       --       --      0.007
             30...       1130    128          32     --       12.5      5.5     --       --       --      0.005
           JUN
             03...       1635    137          30     --       26.0     11.5     --       --       --      0.004
             06...       0810    196          26      7.5     17.0      7.0      608      9.3       96    0.004
             12...       1040    188          25     --       17.5      8.0     --       --       --      0.004
             18...       1040    143          28     --       17.0      7.5     --       --       --      0.004
             26...       1000    120          30     --        9.0      5.5     --       --       --      0.005
           JUL
             02...       1040     87          33     --       20.5     10.0     --       --       --      0.005
             19...       1235     66          35      7.3     18.0     10.0     --       --       --      0.007
           AUG
             16...       0950     34          44     --       19.0     12.0     --       --       --      0.010
           SEP
             06...       1030     25          46      7.6     13.0      7.0      605      9.7      101    0.003



                            10336790  TROUT CREEK AT SOUTH LAKE TAHOE, CA--Continued

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

                        NITRO-   NITRO-                     PHOS-    IRON,             SEDI-     SED.
                         GEN,   GEN,AM-            PHOS-   PHORUS    BIO.              MENT,     SUSP.
                       AMMONIA  MONIA +   PHOS-   PHORUS    ORTHO,   REACT-   SEDI-     DIS-    SIEVE
                         DIS-   ORGANIC  PHORUS     DIS-    DIS-      IVE     MENT,   CHARGE,    DIAM.
                        SOLVED   TOTAL    TOTAL    SOLVED  SOLVED    TOTAL    SUS-      SUS-   % FINER
               DATE     (MG/L    (MG/L    (MG/L    (MG/L   (MG/L    (UG/L     PENDED   PENDED    THAN
                        AS N)    AS N)    AS P)    AS P)   AS P)     AS FE)   (MG/L)  (T/DAY)  .062 MM
                       (00608)  (00625)  (00665)  (00666)  (00671)  (46568)  (80154)  (80155)  (70331)

           OCT
             12...      <0.001     0.15    0.030    0.017    0.010      386        6     0.44     --
           NOV
             21...      <0.001     0.08    0.020    0.010    0.010      254        6     0.31     --
           DEC
             11...       0.008     0.21    0.060    0.027    0.019      845       27     2.5      --
             12...       0.014     1.2     0.232    0.038    0.030     2930      112    38        --
             14...       0.004     0.31    0.034    0.018    0.004      693       15     1.4      --
           JAN
             12...      <0.001     0.09    0.020     --      0.009      359        6     0.31     --
             16...      <0.001     0.53    0.154     --      0.015     5850       93    12        --
             17...      <0.001     0.34    0.048     --      0.010      996       24     2.5      --
           FEB
             04...       0.008     0.18    0.137     --      0.010     2150       86    11        --
             05...       0.006     0.13    0.111     --      0.010     1880       86    23        --
             09...       0.002     0.11    0.035     --      0.010      805       10     1.3      --
           MAR
             08...       0.007     0.19    0.025     --      0.007      461       19     2.4      --
             20...       0.003     0.19    0.045     --      0.007      937       20     3.0      --
           APR
             04...      <0.001     0.24    0.026     --      0.007      672       16     2.3      --
             12...      <0.001     0.31    0.037     --      0.008      858       15     3.0      --
             16...       0.005     0.25    0.071     --      0.011     2000       63    22        --
             17...       0.002     0.36    0.056     --      0.008     1960       29     7.1      --
             25...       0.001     0.09    0.054     --      0.009      787       20     4.9      --
           MAY
             02...       0.001     0.07    0.061     --      0.009      870       27     9.8      --
             06...       0.002     0.29    0.049     --      0.008      907       24     8.0      --
             11...       0.001     0.49    0.038     --      0.008      970       24     8.7      --
             14...       0.002     0.22    0.056     --      0.009      779       27    13        --
             16...       0.010     0.26    0.081     --      0.017     1280       25    21          60
             18...       0.001     0.16    0.037     --      0.009      448       16    10        --
             21...       0.001     0.29    0.046     --      0.008      684       25    10        --
             30...       0.001     0.20    0.026     --      0.007      258       13     4.5      --
           JUN
             03...       0.002     0.30    0.043     --      0.009      630       16     5.9      --
             06...       0.002     0.35    0.025     --      0.008      334       13     6.9      --
             12...       0.002     0.10    0.027     --      0.008      518       23    12        --
             18...      <0.001     0.10    0.034     --      0.008      548       21     8.1      --
             26...       0.001     0.23    0.037     --      0.008      675       20     6.5      --
           JUL
             02...       0.002     0.17    0.038     --      0.009      657       14     3.3      --
             19...       0.001     0.25    0.062     --      0.009      689       13     2.3      --
           AUG
             16...      <0.001     0.12    0.030     --      0.009      397       10     0.92     --
           SEP
             06...      <0.001     0.26    0.030     --      0.012      137        6     0.41     --