10262500 MOJAVE RIVER AT BARSTOW, CA

LOCATION.-Lat 34°54'25", long 117°01'19", in SW 1/4 SE 1/4 sec.31, T.10 N., R.1 W., San Bernardino County, Hydrologic Unit 18090208, on left bank, 75 ft upstream from bridge, on U.S. Highway 91, at Barstow. 
DRAINAGE AREA.-1,291 mi2. 
PERIOD OF RECORD.-October 1930 to current year. 
REVISED RECORDS.-WSP 1564: 1932. 
GAGE.-Water-stage recorder. Datum of gage is 2,089.34 ft above sea level. 
REMARKS.-Flow regulated by Mojave River Forks Reservoir, capacity, 89,700 acre-ft, since 1971, 60 mi upstream, Silverwood Lake, capacity, 78,000 acre-ft, since 1971, and Lake Arrowhead, capacity, 48,000 acre-ft, since 1922. Some water is imported into basin. Diversions and pumping for irrigation of about 15,000 acres upstream from station. See schematic diagram of Mojave River Basin.
EXTREMES FOR PERIOD OF RECORD.-Maximum discharge, 64,300 ft3/s, Mar. 3, 1938, gage height, 8.60 ft on basis of slope-area measurement of peak flow; no flow for all or most of each year.

                  DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1997 TO SEPTEMBER 1998

                                               DAILY MEAN VALUES
 
DAY       OCT      NOV      DEC      JAN      FEB      MAR      APR      MAY      JUN      JUL      AUG      SEP
 
  1       .00      .00      .00      .00      .00      .00    e6.0       .00      .00      .00      .00      .00
  2       .00      .00      .00      .00      .00      .00      .00      .00      .00      .00      .00      .00
  3       .00      .00      .00      .00      .00      .00      .00      .00      .00      .00      .00      .00
  4       .00      .00      .00      .00      .00      .00      .00      .00      .00      .00      .00      .00
  5       .00      .00      .00      .00      .00      .00      .00      .00      .00      .00      .00      .00
  6       .00      .00      .00      .00      .00      .00      .00      .00      .00      .00      .00      .00
  7       .00      .00      .00      .00      .00      .00      .00   e77         .00      .00      .00      .00
  8       .00      .00      .00      .00      .00      .00      .00   290         .00      .00      .00      .00
  9       .00      .00      .00      .00      .00      .00      .00     e.00      .00      .00      .00      .00
 10       .00      .00      .00      .00      .00      .00      .00      .00      .00      .00      .00      .00
 
 11       .00      .00      .00      .00      .00      .00      .00      .00      .00      .00      .00      .00
 12       .00      .00      .00      .00      .00      .00      .00      .00      .00      .00      .00      .00
 13       .00      .00      .00      .00      .00      .00      .00      .00      .00      .00      .00      .00
 14       .00      .00      .00      .00      .00      .00      .00   e20         .00      .00      .00      .00
 15       .00      .00      .00      .00      .00      .00      .00   e20         .00      .00      .00      .00
 16       .00      .00      .00      .00      .00      .00      .00     e.00      .00      .00      .00      .00
 17       .00      .00      .00      .00      .00      .00      .00      .00      .00      .00      .00      .00
 18       .00      .00      .00      .00      .00      .00      .00      .00      .00      .00      .00      .00
 19       .00      .00      .00      .00      .00      .00      .00      .00      .00      .00      .00      .00
 20       .00      .00      .00      .00      .00      .00      .00      .00      .00      .00      .00      .00
 
 21       .00      .00      .00      .00      .00      .00      .00      .00      .00      .00      .00      .00
 22       .00      .00      .00      .00      .00      .00      .00      .00      .00      .00      .00      .00
 23       .00      .00      .00      .00      .00      .00      .00      .00      .00      .00      .00      .00
 24       .00      .00      .00      .00  4100         .00      .00      .00      .00      .00      .00      .00
 25       .00      .00      .00      .00   661         .00      .00      .00      .00      .00      .00      .00
 26       .00      .00      .00      .00   113         .00      .00      .00      .00      .00      .00      .00
 27       .00      .00      .00      .00   e13         .00      .00      .00      .00      .00      .00      .00
 28       .00      .00      .00      .00     e.00      .00      .00      .00      .00      .00      .00      .00
 29       .00      .00      .00      .00      ---      .00      .00      .00      .00      .00      .00      .00
 30       .00      .00      .00      .00      ---      .00      .00      .00      .00      .00      .00      .00
 31       .00      ---      .00      .00      ---      .00      ---      .00      ---      .00      .00      ---
 
TOTAL    0.00     0.00     0.00     0.00  4887.00     0.00     6.00   407.00     0.00     0.00     0.00     0.00
MEAN     .000     .000     .000     .000      175     .000      .20     13.1     .000     .000     .000     .000
MAX       .00      .00      .00      .00     4100      .00      6.0      290      .00      .00      .00      .00
MIN       .00      .00      .00      .00      .00      .00      .00      .00      .00      .00      .00      .00
AC-FT     .00      .00      .00      .00     9690      .00       12      807      .00      .00      .00      .00


STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1931 - 1998, BY WATER YEAR (WY)                                 
  
          OCT      NOV      DEC      JAN      FEB      MAR      APR      MAY      JUN      JUL      AUG      SEP
 
MEAN     .001      .36     3.46     25.5     98.4      114     41.8     5.52     .001     .004     .022     .017
MAX      .061     20.2      116      747     1640     1962      547     93.5     .080     .090     1.31      .71
(WY)     1959     1966     1967     1969     1993     1938     1941     1941     1972     1958     1979     1984
MIN      .000     .000     .000     .000     .000     .000     .000     .000     .000     .000     .000     .000
(WY)     1931     1931     1931     1931     1931     1931     1931     1931     1931     1931     1931     1931
 
SUMMARY STATISTICS           FOR 1997 CALENDAR YEAR        FOR 1998 WATER YEAR           WATER YEARS 1931 - 1998
 
ANNUAL TOTAL                                                   5300.00                                          
ANNUAL MEAN                                                      14.5                       23.7                
HIGHEST ANNUAL MEAN                                                                        202              1969
LOWEST ANNUAL MEAN                                                                            .000          1931
  HIGHEST DAILY MEAN                                             4100     Feb 24           18100       Mar  3 1938
  LOWEST DAILY MEAN                       .00  Jan  1                .00  Oct  1                .00    Oct  1 1930
  ANNUAL SEVEN-DAY MINIMUM                .00  Jan  1                .00  Oct  1                .00    Oct  1 1930
  INSTANTANEOUS PEAK FLOW                                       15200     Feb 24           64300       Mar  3 1938
  INSTANTANEOUS PEAK STAGE                                          3.16  Feb 24               8.60    Mar  3 1938
ANNUAL RUNOFF (AC-FT)                                         10510                      17170                  
10 PERCENT EXCEEDS                      .00                        .00                        .00               
50 PERCENT EXCEEDS                      .00                        .00                        .00               
90 PERCENT EXCEEDS                      .00                        .00                        .00                
    e  Estimated.