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. See schematic diagram of Mojave River Basin.
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 1996 TO SEPTEMBER 1997
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
1 .00 .00 .00 .00 19 16 5.2 6.6 2.4 .00 16 .00
2 .00 .00 .00 .00 19 4.5 4.9 6.2 2.6 .00 12 .00
3 .00 .00 .00 69 36 2.4 5.2 5.5 1.1 .00 .00 .00
4 .00 .00 .00 230 84 .59 4.9 5.2 1.7 .00 19 .00
5 .00 .00 .00 101 94 .18 4.9 5.2 3.9 .00 37 .00
6 .00 .00 .00 71 125 .09 5.1 4.8 4.0 .00 38 .00
7 .00 .00 .00 74 125 .00 5.4 4.6 4.2 .00 40 .00
8 .00 .00 .00 46 126 .00 6.6 4.8 3.8 .00 39 .00
9 .00 .00 5.7 12 124 .00 6.8 4.7 3.8 .00 39 .00
10 .00 .00 25 11 95 .00 6.6 4.3 4.6 .00 39 .00
11 .00 .00 7.1 11 64 .01 5.8 4.5 3.8 .00 40 .00
12 .00 .00 1.3 11 60 .00 5.7 6.1 2.0 .00 32 .00
13 .00 .00 .00 15 33 .00 5.2 6.7 4.0 .00 1.4 .00
14 .00 .00 .00 14 32 .00 6.3 5.7 5.6 .00 .00 .00
15 .00 .00 .00 56 32 .00 6.2 5.4 4.6 .00 .00 .00
16 .00 .00 .00 104 22 .00 6.1 5.1 2.0 .00 .00 .00
17 .00 .00 .00 102 4.1 .00 6.3 5.3 1.9 .00 .00 .00
18 .00 .00 .00 100 3.0 .00 7.2 4.9 3.6 .00 .00 .00
19 .00 .00 .00 52 .65 .00 7.2 4.1 3.1 .00 .00 .00
20 .00 .00 .00 40 .43 .00 7.3 3.7 2.0 .00 .00 .00
21 .00 .00 .00 20 .39 .00 7.2 3.7 1.6 .00 .00 .00
22 .00 3.8 48 14 .23 .00 7.0 3.9 1.1 .00 .00 .00
23 .00 .48 58 63 .12 .00 7.1 4.2 1.9 .00 .00 .00
24 .00 .00 43 111 .09 .00 7.2 4.3 .00 .00 .00 .00
25 .00 .00 2.1 160 .12 .00 7.2 3.9 .00 .00 .00 .00
26 .00 .00 27 951 .18 2.7 6.9 3.8 .00 .00 .00 .00
27 .00 .00 66 354 15 4.4 7.4 3.5 .00 .00 .00 .00
28 .00 .00 70 34 55 4.5 7.3 3.6 .00 .00 .00 .00
29 .00 .00 68 27 --- 4.9 7.4 3.1 .00 .00 .00 .00
30 .00 .00 36 24 --- 4.7 7.2 3.2 .00 3.4 .00 .00
31 .00 --- 2.3 21 --- 5.4 --- 2.4 --- 34 .00 ---
TOTAL 0.00 4.28 459.50 2898.00 1169.31 50.37 190.8 143.0 69.30 37.40 352.40 0.00
MEAN .000 .14 14.8 93.5 41.8 1.62 6.36 4.61 2.31 1.21 11.4 .000
MAX .00 3.8 70 951 126 16 7.4 6.7 5.6 34 40 .00
MIN .00 .00 .00 .00 .09 .00 4.9 2.4 .00 .00 .00 .00
AC-FT .00 8.5 911 5750 2320 100 378 284 137 74 699 .00
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1975 - 1997, BY WATER YEAR (WY)
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
MEAN 2.92 5.37 15.5 80.2 160 163 54.4 30.1 13.9 1.15 .57 .61
MAX 41.8 50.4 68.6 810 883 948 253 296 169 9.23 11.4 8.29
(WY) 1994 1993 1984 1993 1993 1983 1980 1978 1978 1993 1997 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 1996 CALENDAR YEAR FOR 1997 WATER YEAR WATER YEARS 1975 - 1997
ANNUAL TOTAL 4416.34 5374.36
ANNUAL MEAN 12.1 14.7 43.4
HIGHEST ANNUAL MEAN 183 1978
LOWEST ANNUAL MEAN .94 1987
HIGHEST DAILY MEAN 729 Feb 20 951 Jan 26 4900 Feb 10 1978
LOWEST DAILY MEAN .00 Jan 1 .00 Oct 1 .00 Oct 1 1974
ANNUAL SEVEN-DAY MINIMUM .00 Jan 1 .00 Oct 1 .00 Oct 1 1974
INSTANTANEOUS PEAK FLOW 1470 Jan 26 11300 Feb 10 1978
INSTANTANEOUS PEAK STAGE 4.61 Jan 26 23.20 Feb 10 1978
ANNUAL RUNOFF (AC-FT) 8760 10660 31410
10 PERCENT EXCEEDS 23 39 68
50 PERCENT EXCEEDS .00 .09 .00
90 PERCENT EXCEEDS .00 .00 .00
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Last modified: Wed Mar 10 14:06:22 PST 1999