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.


STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1931-1997, BY WATER YEAR (WY)

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

MEAN     .001      .37     3.51     25.8     97.3      116     42.4     5.41     .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 1996 CALENDAR YEAR        FOR 1997 WATER YEAR           WATER YEARS 1931 - 1997

ANNUAL MEAN                                                                                 23.8                
HIGHEST ANNUAL MEAN                                                                        202              1969
LOWEST ANNUAL MEAN                                                                            .000          1931
HIGHEST DAILY MEAN                                                                       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                                                                  64300       Mar  3 1938
INSTANTANEOUS PEAK STAGE                                                                     8.60    Mar  3 1938
ANNUAL RUNOFF (AC-FT)                                                                    17270                  
10 PERCENT EXCEEDS                      .00                        .00                        .00               
50 PERCENT EXCEEDS                      .00                        .00                        .00               
90 PERCENT EXCEEDS                      .00                        .00                        .00