10260820 WEST FORK MOJAVE RIVER BELOW SILVERWOOD LAKE, NEAR HESPERIA, CA
LOCATION.-Lat 34°18'15", long 117°19'06", in SW 1/4 NE 1/4 sec.32, T.3 N., R.4 W., San Bernardino County, Hydrologic Unit 18090208, San Bernardino
National Forest, in control room under spillway, at Cedar Springs Dam, and 8.7 mi south of Hesperia.
DRAINAGE AREA.-34.0 mi2.
PERIOD OF RECORD.-October 1980 to September 1983, October 1995 to current year. Unpublished records for water years 1973-95 available in files of the California
Department of Water Resources.
GAGE.-Flow-meter on release valve and theoretical rating on two slide gates. Elevation of gage is 3,180 ft above sea level, from topographic map. Prior to
October 1983, at recording site 0.3 mi downstream, at different datum.
REMARKS.-Flow regulated by Silverwood Lake (station 10260790). Lake stores water received from the California Aqueduct through Mojave Siphon Powerplant (station
10260780) until it is transferred to San Bernardino area through Devil Canyon Powerplant (station 10263682). Las Flores Release from Aqueduct (station 10260822)
delivers water to vicinity of West Fork Mojave River. See schematic diagram of Mojave River Basin.
COOPERATION.-Records collected by California Department of Water Resources, under general supervision of the U.S. Geological Survey, in connection with a
Federal Energy Regulatory Commission project.
EXTREMES FOR PERIOD OF RECORD.-Maximum discharge, 2,290 ft3/s, Mar. 2, 1983, gage height, 7.51 ft, site and datum then in use; no flow for most of
every 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 27 162 40 41 .00 .00 .00
2 .00 .00 .00 .00 .00 .00 65 40 34 .00 .00 .00
3 .00 .00 .00 .00 .00 .00 51 40 41 .00 .00 .00
4 .00 .00 .00 .00 20 .00 51 40 41 .00 .00 .00
5 .00 .00 .00 .00 .00 .00 51 40 40 .00 .00 .00
6 .00 .00 .00 .00 37 .00 95 179 42 .00 .00 .00
7 .00 .00 .00 .00 92 .00 152 280 42 .00 .00 .00
8 .00 .00 .00 .00 174 .00 80 247 42 24 .00 .00
9 .00 .00 .00 .00 128 .00 74 123 41 33 .00 .00
10 .00 .00 .00 .00 151 .00 100 102 42 14 .00 .00
11 .00 .00 .00 .00 86 .00 100 100 40 .00 .00 .00
12 .00 .00 .00 20 16 67 100 145 41 .00 .00 .00
13 .00 .00 .00 18 .00 99 185 434 40 .00 .00 .00
14 .00 .00 .00 .00 .00 99 245 359 40 .00 .00 .00
15 .00 .00 .00 .00 .00 99 125 232 42 .00 .00 .00
16 .00 .00 .00 .00 .00 99 100 152 42 .00 .00 .00
17 .00 .00 .00 .00 .00 99 100 140 41 .00 .00 .00
18 .00 .00 .00 .00 20 99 100 101 40 .00 .00 .00
19 .00 .00 .00 .00 49 99 100 101 41 .00 .00 .00
20 .00 .00 .00 .00 50 90 90 101 38 .00 .00 .00
21 .00 .00 .00 .00 18 76 75 101 36 .00 .00 .00
22 .00 .00 .00 .00 31 75 60 101 20 .00 .00 .00
23 .00 .00 .00 .00 867 74 74 101 .00 .00 .00 .00
24 .00 .00 .00 .00 935 76 60 101 .00 .00 .00 .00
25 .00 .00 .00 .00 533 119 40 69 .00 .00 .00 .00
26 .00 .00 .00 .00 287 163 40 77 .00 .00 .00 .00
27 .00 .00 .00 .00 82 98 40 100 .00 .00 .00 .00
28 .00 .00 .00 .00 57 210 40 100 .00 .00 .00 .00
29 .00 .00 .00 .00 --- 308 40 72 .00 .00 .00 .00
30 .00 .00 .00 .00 --- 277 40 42 .00 .00 .00 .00
31 .00 --- .00 .00 --- 228 --- 42 --- .00 .00 ---
TOTAL 0.00 0.00 0.00 38.00 3633.00 2581.00 2635 3902 867.00 71.00 0.00 0.00
MEAN .000 .000 .000 1.23 130 83.3 87.8 126 28.9 2.29 .000 .000
MAX .00 .00 .00 20 935 308 245 434 42 33 .00 .00
MIN .00 .00 .00 .00 .00 .00 40 40 .00 .00 .00 .00
AC-FT .00 .00 .00 75 7210 5120 5230 7740 1720 141 .00 .00
a 26100 16690 14190 12050 367 10710 53430 44930 39800 39620 53780 38620
b 26110 16690 14190 12930 8650 18040 50820 42830 42390 46080 50740 37530
c 187 13 144 799 236 119 1350 1350 1320 1400 452 997
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1981 - 1998, BY WATER YEAR (WY)
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
MEAN .060 .89 12.5 24.8 110 153 37.6 36.0 6.46 .88 2.50 .21
MAX .19 4.03 50.8 73.9 403 739 87.8 126 28.9 2.65 14.6 1.18
(WY) 1983 1983 1983 1997 1983 1983 1998 1998 1998 1997 1997 1983
MIN .000 .000 .000 .081 .72 .74 .000 .000 .000 .000 .000 .000
(WY) 1996 1996 1996 1996 1981 1997 1997 1997 1981 1996 1996 1996
SUMMARY STATISTICS FOR 1997 CALENDAR YEAR FOR 1998 WATER YEAR WATER YEARS 1981 - 1998
ANNUAL TOTAL 4453.00 13727.00
ANNUAL MEAN 12.2 37.6 31.7
HIGHEST ANNUAL MEAN 118 1983
LOWEST ANNUAL MEAN 1.14 1981
HIGHEST DAILY MEAN 651 Jan 26 935 Feb 24 1990 Mar 3 1983
LOWEST DAILY MEAN .00 Jan 1 .00 Oct 1 .00 Oct 1 1980
ANNUAL SEVEN-DAY MINIMUM .00 Feb 17 .00 Oct 1 .00 Oct 1 1980
INSTANTANEOUS PEAK FLOW 2290 Mar 2 1983
INSTANTANEOUS PEAK STAGE 7.51 Mar 2 1983
ANNUAL RUNOFF (AC-FT) 8830 27230 22980
TOTAL FLOW (AC-FT) a 359200 350300
TOTAL FLOW (AC-FT) b 437100 367000
TOTAL FLOW (AC-FT) c 5030 8370
10 PERCENT EXCEEDS 49 100 74
50 PERCENT EXCEEDS .00 .00 .02
90 PERCENT EXCEEDS .00 .00 .00
a Flow, in acre-feet, through Mojave Siphon Powerplant, provided by California Department of Water Resources.
b Flow, in acre-feet, through Devil Canyon Powerplant, provided by California Department of Water Resources.
c Flow, in acre-feet, through Las Flores Release, provided by California Department of Water Resources.
USGS Water Resources of California
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Last modified: Wed Aug 4 09:40:26 PDT 1999