10261100 MOJAVE RIVER BELOW MOJAVE RIVER FORKS RESERVOIR, NEAR HESPERIA, CA
LOCATION.--Lat 34°21'17", long 117°14'40", in NE 1/4 NE 1/4 sec.13, T.3 N, R.4 W., San Bernardino County,
Hydrologic Unit 18090208, on left bank 0.8 mi downstream from Mojave River Forks Reservoir, 6.2 mi downstream
from Silverwood Lake on West Fork Mojave River, 6.5 mi southeast of Hesperia, and 12.2 mi downstream from Lake
Arrowhead on Deep Creek (head of Mojave River).
DRAINAGE AREA.--211 mi2.
PERIOD OF RECORD.--October 1971 to September 1974, October 1980 to current year. Prior to 1990, published as
"below Forks Reservoir" and "below Mojave Forks Reservoir."
GAGE.--Water-stage recorder. Elevation of gage is 3,000 ft above sea level, from topographic map. October 1971
to September 1974, water-stage recorder at site 0.8 mi upstream on reservoir outlet channel at different
datum. Prior to December 14, 1995, at datum 5.00 ft higher.
REMARKS.--Records fair except those for estimated daily discharges, which are poor. Flow partially regulated by
Lake Arrowhead, capacity, 48,000 acre-ft, used principally for recreation; Silverwood Lake, capacity, 78,000
acre-ft, used for the storage and distribution of imported water and recreation; and Mojave River Forks
Reservoir, capacity 89,700 acre-ft, used for flood control. Silverwood Lake releases all natural inflow to
the West Fork Mojave River as soon as possible after a storm. Sewage effluent from Lake Arrowhead area is
released above gage at times.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 21,300 ft3/s, Feb. 8, 1993, maximum gage height, 12.61 ft,
Jan. 7, 1993; no flow for many days in some years.
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 e2.0 e5.7 e6.1 8.3 238 70 61 8.6 3.8 .00 .00 .00
2 e2.0 e5.8 e6.1 8.1 84 75 75 10 3.7 .00 .00 .00
3 e2.0 e5.8 e6.1 7.8 55 83 72 8.3 3.9 .00 .00 .00
4 e2.0 e5.8 e6.2 8.0 e43 88 66 8.0 3.4 .00 .00 .00
5 e2.0 e5.9 e6.2 8.0 e37 1340 66 7.2 3.8 .00 .00 .00
6 e2.0 e5.9 e6.2 7.8 e36 400 58 6.7 4.0 .00 .00 .00
7 e2.0 e5.9 e6.2 7.8 e31 143 50 5.8 3.5 .00 .00 .00
8 e2.0 e5.9 e6.2 7.6 e28 127 44 4.8 2.3 .00 .00 .00
9 e2.0 e5.9 e6.3 7.7 e27 123 44 5.1 1.7 .00 .00 .00
10 e2.0 e5.9 e6.3 8.0 e26 106 72 5.0 1.2 .00 .00 .00
11 e2.1 e5.9 e6.4 7.7 e25 100 88 4.6 .00 .00 .00 .00
12 e2.2 e5.9 e6.4 8.0 e23 110 79 3.5 .00 .00 .00 .00
13 e2.3 e5.9 e6.4 7.8 e22 464 72 3.1 .00 .00 .00 .00
14 e2.6 e5.9 8.3 8.7 e21 362 72 2.7 .00 .00 .00 .00
15 e2.8 e5.9 10 7.4 e21 228 64 3.5 .00 .00 .00 .00
16 e3.1 e5.9 8.4 6.6 e20 133 46 3.7 .00 .00 .00 .00
17 e3.3 e5.9 8.1 6.5 e19 132 43 4.3 .00 .00 .00 .00
18 e3.5 e5.9 8.1 6.6 e17 132 43 16 .00 .00 .00 .00
19 e3.8 e6.0 7.9 6.8 e16 123 48 21 .00 .00 .00 .00
20 e4.0 e6.0 7.8 7.0 2220 119 46 20 .00 .00 .00 .00
21 e4.2 e6.0 7.8 7.6 4500 111 43 14 .00 .00 .00 .00
22 e4.4 e6.0 7.8 9.5 862 111 41 6.4 .00 .00 .00 .00
23 e4.5 e6.0 8.3 11 427 115 40 5.3 .00 .00 .00 .00
24 e4.7 e6.0 8.8 9.7 180 108 38 5.5 .00 .00 .00 .00
25 e4.9 e6.0 8.3 9.3 166 97 38 7.1 .00 .00 .00 .00
26 e5.0 e6.0 8.1 8.7 151 82 38 8.0 .00 .00 .00 .00
27 e5.2 e6.1 8.0 8.6 97 79 37 5.4 .00 .00 .00 .00
28 e5.3 e6.1 8.1 8.6 84 82 35 5.0 .00 .00 .00 .00
29 e5.4 e6.1 7.9 9.3 76 79 14 4.7 .00 .00 .00 .00
30 e5.5 e6.1 7.9 9.4 --- 75 11 6.3 .00 .00 .00 .00
31 e5.6 --- 8.2 95 --- 69 --- 3.9 --- .00 .00 ---
TOTAL 104.4 178.1 228.9 338.9 9552 5466 1544 223.5 31.30 0.00 0.00 0.00
MEAN 3.37 5.94 7.38 10.9 329 176 51.5 7.21 1.04 .000 .000 .000
MAX 5.6 6.1 10 95 4500 1340 88 21 4.0 .00 .00 .00
MIN 2.0 5.7 6.1 6.5 16 69 11 2.7 .00 .00 .00 .00
AC-FT 207 353 454 672 18950 10840 3060 443 62 .00 .00 .00
e Estimated.
10261100 MOJAVE RIVER BELOW MOJAVE RIVER FORKS RESERVOIR, NEAR HESPERIA, CA--Continued
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1972 - 1996, BY WATER YEAR (WY)
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
MEAN 7.61 19.7 54.8 238 333 321 144 54.4 17.5 3.81 1.93 1.52
MAX 57.8 73.9 263 2873 2910 2004 544 333 109 17.1 22.7 12.0
(WY) 1984 1983 1972 1993 1993 1983 1983 1983 1993 1983 1983 1993
MIN .000 .000 .000 .000 11.1 15.0 10.6 .20 .000 .000 .000 .000
(WY) 1986 1989 1990 1991 1987 1972 1972 1990 1989 1985 1985 1984
SUMMARY STATISTICS FOR 1995 CALENDAR YEAR FOR 1996 WATER YEAR WATER YEARS 1972 - 1996
ANNUAL TOTAL 86444.6 17667.10
ANNUAL MEAN 237 48.3 98.7
HIGHEST ANNUAL MEAN 592 1993
LOWEST ANNUAL MEAN 7.34 1990
HIGHEST DAILY MEAN 6800 Jan 11 4500 Feb 21 15000 Feb 19 1993
LOWEST DAILY MEAN 1.6 Aug 15 .00 Jun 11 .00 Jul 4 1981
ANNUAL SEVEN-DAY MINIMUM 1.6 Aug 15 .00 Jun 11 .00 Jul 4 1981
INSTANTANEOUS PEAK FLOW 8600 Feb 20 21300 Feb 8 1993
INSTANTANEOUS PEAK STAGE 9.79 Feb 20 7.61 Jan 7 1993
ANNUAL RUNOFF (AC-FT) 171500 35040 71490
10 PERCENT EXCEEDS 451 82 158
50 PERCENT EXCEEDS 26 5.9 8.0
90 PERCENT EXCEEDS 1.7 .00 .00
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