10256060  WHITEWATER RIVER AT WHITE WATER CUTOFF, AT WHITE WATER, CA

LOCATION.--Lat 33°55'31", long 116°38'07", in NE 1/4 SE 1/4 sec.11, T.3 S., R.3 E., Riverside County, Hydrologic
   Unit 18100200, on center pier of White Water Cutoff (old Highway 99) bridge, 0.1 mi east of White Water,
   0.75 mi downstream from Metropolitan Water District's Colorado River Aqueduct turnout, and 2.0 mi upstream
   from San Gorgonio River.

DRAINAGE AREA.--59.1 mi2.

                                             WATER-DISCHARGE RECORDS

PERIOD OF RECORD.--October 1985 to September 1987 and October 1988 to September 1990.  Discharge measurements for
   the period October 1984 to September 1985 available in files of the U.S. Geological Survey.  Discharge
   measurements only, October 1987 to September 1988, October 1990 to current year.  Station discontinued as
   continuous-record site effective Sept. 30, 1993.

GAGE.--None.  Elevation of station is 1,360 ft above sea level, from topographic map.

REMARKS.--Indeterminate stage-discharge relationship.  At times, imported water is released to the Whitewater
   River from the Colorado River Aqueduct at a point 0.75 mi upstream.  Water is diverted out of the basin
   16.5 mi upstream to powerplants in the San Gorgonio River basin and then to an area north of Banning for
   irrigation.  See schematic diagram of Salton Sea basin.

EXTREMES FOR PERIOD OF RECORD (1986-87 AND 1989-90).--Maximum discharge, 2,020 ft3/s, Feb. 15, 1986, gage height,
   11.97 ft, from rating curve extended above 900 ft3/s; no flow for many days in some years.



                        DISCHARGE MEASUREMENTS, WATER YEAR OCTOBER 1995 TO SEPTEMBER 1996

                                                                   Discharge
                                         Date            Time       (ft3/s)

                                        Oct.   4         0847         186
                                        Nov.  13         1040         190
                                        Nov.  28         1137          16.5
                                        Jan.   4         1153          15.4
                                        Feb.   8         0730          16.9
                                        Mar.   6         1504          39.5
                                        Apr.   3         0840          15.7
                                        Apr.  17         1745         317
                                        May    6         0820         202
                                        June   4         0637         382
                                        July   1         0810         269
                                        Aug.   6         0743         266
                                        Sept.  5         0735         337

                    10256060  WHITEWATER RIVER AT WHITE WATER CUTOFF, AT WHITE WATER, CA--Continued

                                                 WATER-QUALITY RECORDS

PERIOD OF RECORD.--
  CHEMICAL DATA:  Water years 1972-76, 1978 to September 1996 (discontinued).



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

                            DIS-              PH                        HARD-
                          CHARGE,   SPE-     WATER             HARD-    NESS              MAGNE-
                           INST.    CIFIC    WHOLE             NESS    NONCARB  CALCIUM    SIUM,  SODIUM,
                           CUBIC    CON-     FIELD   TEMPER-   TOTAL   DISSOLV   DIS-      DIS-    DIS-
                            FEET    DUCT-   (STAND-   ATURE    (MG/L   FLD. AS   SOLVED   SOLVED  SOLVED
         DATE      TIME     PER     ANCE      ARD     WATER     AS      CACO3    (MG/L    (MG/L    (MG/L    SODIUM
                           SECOND  (US/CM)   UNITS)  (DEG C)   CACO3)  (MG/L)    AS CA)   AS MG)   AS NA)  PERCENT

        NOV
          13...    1155    190        970      8.5     20.0      290      160     72       27       89         39
        APR
          16...    1530   E250       1000      8.5     19.0      300      160     76       26       89         39



                                   BICAR-    CAR-     ALKA-                                       SOLIDS,  SOLIDS,
                  SODIUM   POTAS-  BONATE   BONATE   LINITY             CHLO-    FLUO-   SILICA,  RESIDUE  SUM OF
                    AD-     SIUM,   WATER    WATER   WAT DIS  SULFATE   RIDE,    RIDE,    DIS-    AT 180   CONSTI-
                  SORP-     DIS-   DIS IT   DIS IT   TOT IT    DIS-     DIS-      DIS-    SOLVED   DEG. C  TUENTS,
                   TION    SOLVED   FIELD    FIELD    FIELD    SOLVED   SOLVED   SOLVED   (MG/L     DIS-     DIS-
         DATE     RATIO    (MG/L   MG/L AS  MG/L AS  MG/L AS   (MG/L    (MG/L    (MG/L     AS      SOLVED   SOLVED
                           AS K)    HCO3      CO3     CACO3   AS SO4)   AS CL)   AS F)    SIO2)    (MG/L)   (MG/L)

        NOV
          13...      2       4.7      146        5      128     240      80        0.50     9.3       604      600
        APR
          16...      2       4.8      153        4      132     250      83        0.40     7.9       628      617



                           NITRO-   NITRO-   NITRO-   NITRO-            PHOS-
                 SOLIDS,    GEN,     GEN,     GEN,   GEN,AM-   PHOS-   PHORUS                               MANGA-
                   DIS-   NITRITE  NO2+NO3  AMMONIA  MONIA +  PHORUS    ORTHO,  ARSENIC   BORON,   IRON,    NESE,
                  SOLVED    DIS-     DIS-     DIS-   ORGANIC    DIS-    DIS-      DIS-     DIS-     DIS-     DIS-
                  (TONS    SOLVED   SOLVED   SOLVED   DIS.     SOLVED  SOLVED    SOLVED   SOLVED   SOLVED   SOLVED
         DATE      PER     (MG/L    (MG/L    (MG/L    (MG/L    (MG/L   (MG/L     (UG/L    (UG/L    (UG/L    (UG/L
                  AC-FT)   AS N)    AS N)    AS N)    AS N)    AS P)   AS P)     AS AS)   AS B)    AS FE)   AS MN)

        NOV
          13...     0.82   <0.010    0.170   <0.015    <0.20   <0.010   <0.010       2      130       <3       <1
        APR
          16...     0.85   <0.010    0.200   <0.015    <0.20   <0.010   <0.010       2      130        3       <1