10256500  SNOW CREEK NEAR WHITE WATER, CA

LOCATION.--Lat 33°52'14", long 116°40'49", in NW 1/4 NW 1/4 sec.33, T.3 S., R.3 E., Riverside County, Hydrologic
   Unit 18100200, on left bank at upstream side of Desert Water Agency Diversion Dam, 0.1 mi downstream from East
   Fork, and 4.4 mi southwest of White Water.
DRAINAGE AREA.--10.9 mi2.
                                             WATER-DISCHARGE RECORDS

PERIOD OF RECORD.--July to December 1921, May 1922 to February 1927, December 1927 to September 1931, October
   1959 to current year.  Yearly discharges for 1929-31, published in WSP 1314.  Discharge records for Snow Creek
   Diversion (station 10256550) since October 1978, and those for creek only October 1978 through September 1988
   available in files of the U.S. Geological Survey.
REVISED RECORDS.--WDR CA-89-1:  Drainage area.  WDR CA-90-1:  1980 Combined discharge.  WDR CA-93-1:  1991.
   WDR CA-96-1:  1969(M), 1976(M).
GAGE.--Water-stage recorder and broad-crested weir on creek, non-recording flow meter on diversion.  Elevation of
   gage is 2,000 ft above sea level, from topographic map.  Prior to October 1931, at various sites within 500 ft
   of present site at different datums.  October 1959 to Oct. 6, 1970, at site 40 ft upstream at present datum.
   Oct. 6, 1970, to Oct. 25, 1978, at site 290 ft upstream from diversion at present datum.  Gage moved to
   present site 10 ft downstream from diversion Oct. 25, 1978.
REMARKS.--Records fair except for estimated daily discharges, which are poor.  No regulation upstream from
   station.  Diversion (station 10256550) 10 ft upstream, generally taking most of the base flow.  For combined
   record of creek and diversion, see station 10256501.  Published record prior to 1989 represents entire flow
   from basin (combined creek plus diversion prior to March 1927 and October 1978 to September 1988; creek only,
   upstream from diversion, December 1927 to September 1931 and October 1959 to September 1978).  Both creek only
   and combined flow published beginning October 1989.  Statistics for station 10256501 (combined flow) reflect
   equivalent total flow from basin.  See schematic diagram of Salton Sea basin.
COOPERATION.--Records for diversion provided by Desert Water Agency.
EXTREMES FOR PERIOD OF RECORD (Combined creek and diversion).-- Maximum discharge, 9,900 ft3/s (revised), Jan.
   25, 1969, gage height, 13.8 ft, from floodmarks, site and datum then in use, from rating curve extended above
   55 ft3/s on basis of slope-area measurement of peak flow; minimum daily, 2.1 ft3/s, June 23-27, Sept. 5-11,
   1961.
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 100 ft3/s, or maximum:

                      Creek only                        Combined creek and diversion
                       Discharge       Gage height               Discharge
 Date       Time        (ft3/s)            (ft)                   (ft3/s)
Feb. 21     1515          169              3.78                     169

REVISIONS.--The maximum discharges for the water years 1969 and 1976 have been revised to 9,900 ft3/s,
   Jan. 25, 1969, gage height, 13.8 ft, from floodmarks, site and datum then in use, and 2,800 ft3/s,
   Sept. 10, 1976, gage height, 6.80 ft, site and datum then in use, superseding figures published in reports
   for 1969 and 1976.

                  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       .88     2.0      1.0      1.2      28        5.2      3.2     2.5       .70     3.1      1.3       .36
  2       .92     3.4      1.0      1.2      12        3.5      5.8     2.5       .55     2.2       .91      .44
  3       .77      .90     1.0      1.2       9.3      3.4      3.4     2.4       .29     3.2       .18      .42
  4       .78      .80      .99     1.3       8.1      5.2      3.3     2.2       .14     3.0       .71      .42
  5      1.1       .74     1.0      1.3       7.5     29        3.1     1.9       .35     1.2       .08      .39
  6       .97      .76     1.1      1.3       6.1     15        2.9     2.0       .34      .19      .10      .42
  7       .95      .79     1.0      1.3       2.7      9.6      2.8     1.9       .35      .25      .08      .53
  8       .94      .78      .97     1.2       2.2      7.2      2.7     1.8       .33      .31      .06      .45
  9       .90      .77     1.0      1.2       2.1      6.3      2.5     1.8       .28      .51      .08      .42
 10       .86      .81     1.0      1.2       2.0      6.0      2.7     1.7       .20      .59      .10      .41

 11       .86      .82      .96     1.2       1.7      5.6      2.7     1.6       .17      .48      .13      .38
 12       .87      .94      .88     1.2       3.0      6.9      2.6     1.6       .14      .44      .20      .36
 13       .83      .87     3.1      1.1       5.6     12        2.7     1.6       .18      .69      .19      .45
 14       .72      .95     3.5      1.1       5.8     13        2.6     1.5       .20     1.1      1.2       .42
 15       .72      .90     3.1      1.1       3.2     12        2.5     1.5       .20      .98     2.8       .44
 16       .73      .88     5.6      1.0       1.4     12        2.6     1.8       .19     1.5      1.5       .42
 17       .56      .90     5.6      4.4       1.3     11        2.5     1.5       .17     1.7       .45      .41
 18       .80      .99     2.9      4.4       1.2      9.1     15       1.3       .15     1.4       .40      .45
 19       .83      .94     1.2      4.4       2.0      7.6      9.1     1.3       .13     1.3       .46      .33
 20       .90      .90     1.1      4.6      62        6.8      4.3     1.3       .14     1.2       .67      .20

 21       .80      .90     1.1      5.2      76        6.5      3.6     1.2       .47     1.3       .47      .18
 22       .87      .84     1.1      7.3      30        6.5      3.2     1.1       .57     1.2      1.4       .18
 23       .98      .95     4.3      5.6      15        6.2      3.0     1.1       .53     1.1      2.2       .21
 24       .96     1.0      5.9      5.3      13        5.7      2.8     1.2       .54     1.2      2.8       .19
 25       .98     1.0      5.9      5.1      12        4.7      3.2     1.3       .47     1.3      2.7       .23
 26       .85      .97     3.7      3.0      11        4.1      3.5     1.1       .70     1.5      2.9       .25
 27       .84     1.1      1.2      1.1       8.4      3.9      3.5     1.1       .77     1.2      1.5       .18
 28       .92      .97     1.1       .90      7.8      4.8      3.8      .98      .75     1.7       .57      .15
 29       .97      .96     1.0       .94      7.7      5.4      3.1      .93      .57     1.3       .48      .14
 30       .95      .97     1.1      2.6       ---      3.6      2.7      .94     1.2      1.3       .61      .16
 31      1.0       ---     1.2     16         ---      3.4      ---      .85      ---     1.4       .43      ---

TOTAL   27.01    30.50    65.60    89.94    348.1    241.2    111.4    47.50    11.77    39.84    27.66     9.99
MEAN      .87     1.02     2.12     2.90     12.0     7.78     3.71     1.53      .39     1.29      .89      .33
MAX       1.1      3.4      5.9       16       76       29       15      2.5      1.2      3.2      2.9      .53
MIN       .56      .74      .88      .90      1.2      3.4      2.5      .85      .13      .19      .06      .14
AC-FT      54       60      130      178      690      478      221       94       23       79       55       20


                              10256500  SNOW CREEK NEAR WHITE WATER, CA--Continued

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1979 - 1996, BY WATER YEAR (WY)

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

MEAN     2.49     3.69     5.72     16.1     24.4     19.1     12.0     11.8     6.72     3.99     3.26     2.24
MAX      6.55     13.3     24.0      131      173     71.5     28.6     40.8     31.7     14.4     18.0     7.55
(WY)     1993     1984     1984     1993     1980     1995     1983     1983     1983     1983     1983     1983
MIN      .008      .30     .000      .99     3.14     2.32     1.09      .29      .14     .000     .001      .17
(WY)     1985     1982     1982     1994     1984     1984     1984     1984     1984     1981     1981     1981

SUMMARY STATISTICS           FOR 1995 CALENDAR YEAR        FOR 1996 WATER YEAR           WATER YEARS 1979 - 1996

ANNUAL TOTAL                        6292.81                    1050.51
ANNUAL MEAN                           17.2                        2.87                       9.22
HIGHEST ANNUAL MEAN                                                                         28.4            1980
LOWEST ANNUAL MEAN                                                                           2.21           1981
HIGHEST DAILY MEAN                   481     Mar  5              76     Feb 21             909       Jan  7 1993
LOWEST DAILY MEAN                       .56  Oct 17                .06  Aug  8                .00    Nov  8 1978
ANNUAL SEVEN-DAY MINIMUM                .74  Oct 13                .09  Aug  5                .00    Oct  5 1979
INSTANTANEOUS PEAK FLOW                                         169     Feb 21            1910       Jan  7 1993
INSTANTANEOUS PEAK STAGE                                          3.78  Feb 21               7.35    Jan  7 1993
ANNUAL RUNOFF (AC-FT)              12480                       2080                       6680
10 PERCENT EXCEEDS                    34                          6.1                       20
50 PERCENT EXCEEDS                     8.1                        1.1                        3.5
90 PERCENT EXCEEDS                      .90                        .29                        .22

                               10256500  SNOW CREEK NEAR WHITE WATER, CA--Continued

                                              WATER-QUALITY RECORDS

PERIOD OF RECORD.--
  CHEMICAL DATA:  Water years 1972-76, 1978 to current year.


                            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
       27...       1145    a5.2       104      8.2     11.5       34       0      12       0.99     8.8       35
     APR
       16...       0930    a7.0        94      8.1     11.5       31       0      11       0.90     7.3       32



                                   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
       27...         0.7     1.8        62       0        51     1.1      1.4     <0.10    21         72       78
     APR
       16...         0.6     1.8        57       0        46     1.2      1.3     <0.10    20         68       72



                           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
       27...        0.10   <0.010   <0.050   <0.015    <0.20   <0.010   <0.010       <1     20       <3.0    <1.0
     APR
       16...        0.09   <0.010    0.090   <0.015    <0.20    0.010   <0.010       <1     30        5.0    <1.0


 a  Discharge represents total flow (creek plus diversion).