10260950 WEST FORK MOJAVE RIVER ABOVE MOJAVE RIVER FORKS RESERVOIR, NEAR HESPERIA, CA
LOCATION.--Lat 34°20'20", long 117°15'25", in NW 1/4 NW 1/4 sec.24, T.3 N., R.4 W., San Bernardino County,
Hydrologic Unit 18090208, on left bank on upstream wingwall of concrete double-box culvert on Arrowhead Lake
Road, 0.1 mi northeast of junction with Highway 174, 4.5 mi downstream from Cedar Springs Dam on Silverwood
Lake, and 6.5 mi southeast of Hesperia.
DRAINAGE AREA.--70.3 mi2.
PERIOD OF RECORD.--October 1974 to current year. October 1974 to September 1991 published incorrectly as station
10261000. Records for station 10261000 are not equivalent due to difference in drainage area.
REVISED RECORDS.--WDR CA-84: 1983.
GAGE.--Water-stage recorder. Elevation of gage is 3,040 ft above sea level, from topographic map.
REMARKS.--Records poor. Regulated by Silverwood Lake (holding basin for imported water), total capacity,
78,000 acre-ft, 4.5 mi upstream, which releases all natural inflow as soon as possible after a storm.
EXTREMES FOR THE PERIOD OF RECORD.--Maximum discharge, 11,300 ft3/s, Feb. 10, 1978, gage height unknown, on basis
of slope-area measurement of peak flow; maximum gage height, 23.2 ft, Feb. 10, 1978, backwater from Mojave
River Forks Reservoir; no flow for several months in most years.
EXTREMES OUTSIDE PERIOD OF RECORD.--Maximum discharge, 26,100 ft3/s, Mar. 2, 1938, gage height unknown, on basis
of slope-area measurement of peak flow for station 10261000 at site 1.5 mi downstream.
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 .00 .00 .00 .00 26 22 6.2 2.2 e.00 .00 .00 .00
2 .00 .00 .00 .00 13 22 10 3.1 e.00 .00 .00 .00
3 .00 .00 .00 .00 7.9 21 8.3 5.1 e.00 .00 .00 .00
4 .00 .00 .00 .00 5.0 36 6.6 4.6 e.00 .00 .00 .00
5 .00 .00 .00 .00 4.7 588 5.2 1.1 e.00 .00 .00 .00
6 .00 .00 .00 .00 4.6 74 5.2 .77 .00 .00 .00 .00
7 .00 .00 .00 .00 e.00 31 5.2 .61 .00 .00 .00 .00
8 .00 .00 .00 .00 e.00 28 4.9 .59 .00 .00 .00 .00
9 .00 .00 .00 .00 e.00 25 14 .62 .00 .00 .00 .00
10 .00 .00 .00 .00 e.00 18 50 .56 .00 .00 .00 .00
11 .00 .00 .00 .00 e.00 16 50 .54 .00 .00 .00 .00
12 .00 .00 .00 .00 e.00 36 48 .53 .00 .00 .00 .00
13 .00 .00 .00 .00 e.00 233 48 .40 .00 .00 .00 .00
14 .00 .00 .00 .00 e.00 105 47 .18 .00 .00 .00 .00
15 .00 .00 .00 .00 e.00 54 28 .18 .00 .00 .00 .00
16 .00 .00 .00 .00 e.00 25 4.3 .18 .00 .00 .00 .00
17 .00 .00 .00 .00 e.00 18 3.6 1.9 .00 .00 .00 .00
18 .00 .00 .00 .00 e.00 14 5.3 22 .00 .00 .00 .00
19 .00 .00 .00 .00 e.00 11 3.7 28 .00 .00 .00 .00
20 .00 .00 .00 .00 e729 11 3.5 28 .00 .00 .00 .00
21 .00 .00 .00 .00 e520 10 3.5 6.8 .00 .00 .00 .00
22 .00 .00 .00 .00 e135 11 3.4 e.00 .00 .00 .00 .00
23 .00 .00 .00 .00 203 10 3.4 e.00 .00 .00 .00 .00
24 .00 .00 .00 .00 91 9.3 3.4 e.00 .00 .00 .00 .00
25 .00 .00 .00 .00 104 9.5 3.4 e.00 .00 .00 .00 .00
26 .00 .00 .00 .00 66 8.3 2.9 e.00 .00 .00 .00 .00
27 .00 .00 .01 .00 19 7.6 2.3 e.00 .00 .00 .00 .00
28 .00 .00 .00 .00 20 6.9 1.8 e.00 .00 .00 .00 .00
29 .00 .00 .00 .00 22 6.8 1.8 e.00 .00 .00 .00 .00
30 .00 .00 .00 .00 --- 6.2 2.0 e.00 .00 .00 .00 .00
31 .00 --- .00 9.5 --- 6.4 --- e.00 --- .00 .00 ---
TOTAL 0.00 0.00 0.01 9.50 1970.20 1480.0 384.9 107.96 0.00 0.00 0.00 0.00
MEAN .000 .000 .000 .31 67.9 47.7 12.8 3.48 .000 .000 .000 .000
MAX .00 .00 .01 9.5 729 588 50 28 .00 .00 .00 .00
MIN .00 .00 .00 .00 .00 6.2 1.8 .00 .00 .00 .00 .00
AC-FT .00 .00 .02 19 3910 2940 763 214 .00 .00 .00 .00
e Estimated.
10260950 WEST FORK MOJAVE RIVER ABOVE MOJAVE RIVER FORKS RESERVOIR, NEAR HESPERIA, CA--Continued
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1975 - 1996, BY WATER YEAR (WY)
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
MEAN 3.06 5.61 15.5 79.6 165 170 56.6 31.3 14.4 1.15 .080 .64
MAX 41.8 50.4 68.6 810 883 948 253 296 169 9.23 1.05 8.29
(WY) 1994 1993 1984 1993 1993 1983 1980 1978 1978 1993 1983 1993
MIN .000 .000 .000 .000 .61 .24 .000 .000 .000 .000 .000 .000
(WY) 1975 1975 1976 1975 1991 1977 1987 1984 1975 1975 1975 1975
SUMMARY STATISTICS FOR 1995 CALENDAR YEAR FOR 1996 WATER YEAR WATER YEARS 1975 - 1996
ANNUAL TOTAL 30050.36 3952.57
ANNUAL MEAN 82.3 10.8 44.7
HIGHEST ANNUAL MEAN 183 1978
LOWEST ANNUAL MEAN .94 1987
HIGHEST DAILY MEAN 1970 Jan 11 729 Feb 20 4900 Feb 10 1978
LOWEST DAILY MEAN .00 Jan 1 .00 Oct 1 .00 Oct 1 1974
ANNUAL SEVEN-DAY MINIMUM .00 Aug 12 .00 Oct 1 .00 Oct 1 1974
INSTANTANEOUS PEAK FLOW 2440 Feb 20 11300 Feb 10 1978
INSTANTANEOUS PEAK STAGE 6.63 Feb 20 23.20 Feb 10 1978
ANNUAL RUNOFF (AC-FT) 59600 7840 32350
10 PERCENT EXCEEDS 150 17 69
50 PERCENT EXCEEDS 8.2 .00 .00
90 PERCENT EXCEEDS .00 .00 .00
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