10260550 WEST FORK MOJAVE RIVER ABOVE SILVERWOOD LAKE, NEAR HESPERIA, CA
LOCATION.-Lat 34°17'06", long 117°22'16", in NW 1/4 SE 1/4 sec.2, T.2 N., R.5 W., San Bernardino
County, Hydrologic Unit 18090208, San Bernardino National Forest, on left bank, 1.5 mi upstream from Silverwood
Lake, and 10.6 mi southwest of Hesperia.
DRAINAGE AREA.-3.22 mi2.
PERIOD OF RECORD.-October 1995 to current year. Unpublished records for water years 1961-95 available in files of
the California Department of Water Resources.
GAGE.-Water-stage recorder and concrete control. Elevation of gage is 3,550 ft above sea level, from topographic
map.
REMARKS.-No regulation or diversion upstream from station. See schematic diagram of the Mojave River Basin.
COOPERATION.-Records were 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, 584 ft3/s, Feb. 23, 1998, gage height, 3.88 ft; no
flow for many days in each year.
DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1998 TO SEPTEMBER 1999
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
1 .31 .31 .48 .48 1.1 .71 .74 1.3 .53 .02 .00 .00
2 .27 .32 .48 .48 .89 .68 .71 1.2 .74 .01 .00 .00
3 .31 .30 .50 .48 .85 .65 .84 1.3 .68 .01 .00 .00
4 .32 .30 .77 .48 .93 .70 .85 1.3 .65 .01 .00 .00
5 .27 .31 .59 .48 1.3 .68 .81 1.2 .60 .01 .00 .00
6 .23 .34 .57 .48 1.3 .65 1.9 1.1 .56 .00 .00 .00
7 .23 .37 .53 .48 1.3 .65 2.6 1.1 .53 .00 .00 .00
8 .21 .45 .53 .48 1.3 .65 2.4 1.1 .53 .00 .00 .00
9 .22 .46 .51 .48 2.5 .65 2.4 1.0 .51 .00 .00 .00
10 .22 .39 .48 .48 2.9 .65 2.0 .98 .47 .00 .00 .00
11 .21 .45 .48 .48 1.7 .65 2.7 .96 .45 .00 .00 .00
12 .21 .47 .48 .48 1.4 .65 8.9 .90 .41 .00 .00 .00
13 .20 .44 .48 .48 1.2 .65 5.3 .89 .37 .00 .00 .00
14 .20 .44 .48 .48 1.1 .63 4.5 .87 .33 .00 .00 .00
15 .25 .42 .48 .47 1.0 1.0 3.6 .86 .29 .00 .00 .00
16 .26 .37 .48 .44 .95 .88 2.8 .82 .27 .00 .00 .00
17 .23 .36 .48 .44 .89 .85 2.4 .80 .25 .00 .00 .00
18 .23 .39 .48 .44 .85 .85 2.1 .80 .23 .00 .00 .00
19 .24 .39 .49 .44 .85 .85 1.8 .85 .21 .00 .00 .00
20 .23 .39 .56 .46 .81 .89 1.7 .82 .19 .00 .00 .00
21 .22 .38 .53 .48 .78 .88 1.5 .82 .18 .00 .00 .00
22 .22 .35 .53 .48 .75 .85 1.5 .84 .17 .00 .00 .00
23 .23 .35 .53 .48 .71 .85 1.4 .81 .15 .00 .00 .00
24 .24 .38 .53 .48 .71 .82 1.4 .81 .12 .00 .00 .00
25 .26 .39 .53 .62 .68 .78 1.3 .74 .11 .00 .00 .00
26 .28 .39 .53 .74 .65 .78 1.2 .65 .10 .00 .00 .00
27 .28 .39 .53 .78 .65 .75 1.2 .64 .08 .00 .00 .00
28 .26 .86 .53 .66 .65 .71 1.4 .60 .06 .00 .00 .00
29 .27 .55 .48 .65 --- .69 1.3 .57 .04 .00 .00 .00
30 .33 .51 .48 .69 --- .66 1.3 .58 .04 .00 .00 .00
31 .31 --- .48 1.3 --- .71 --- .55 --- .00 .00 ---
TOTAL 7.75 12.22 16.01 16.77 30.70 23.05 64.55 27.76 9.85 0.06 0.00 0.00
MEAN .25 .41 .52 .54 1.10 .74 2.15 .90 .33 .002 .000 .000
MAX .33 .86 .77 1.3 2.9 1.0 8.9 1.3 .74 .02 .00 .00
MIN .20 .30 .48 .44 .65 .63 .71 .55 .04 .00 .00 .00
AC-FT 15 24 32 33 61 46 128 55 20 .1 .00 .00
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1996 - 1999, BY WATER YEAR (WY)
MEAN .081 .19 1.46 3.86 10.5 5.42 3.97 4.85 1.67 .46 .11 .065
MAX .25 .41 4.49 12.8 26.5 12.5 10.5 17.1 5.94 1.81 .44 .26
(WY) 1999 1999 1997 1997 1998 1998 1998 1998 1998 1998 1998 1998
MIN .000 .041 .31 .54 1.10 .74 1.03 .48 .13 .000 .000 .000
(WY) 1998 1998 1996 1999 1999 1999 1997 1997 1997 1997 1996 1996
SUMMARY STATISTICS FOR 1998 CALENDAR YEAR FOR 1999 WATER YEAR WATER YEARS 1996 - 1999
ANNUAL TOTAL 2314.82 208.72
ANNUAL MEAN 6.34 .57 2.67
HIGHEST ANNUAL MEAN 6.29 1998
LOWEST ANNUAL MEAN .57 1999
HIGHEST DAILY MEAN 278 Feb 23 8.9 Apr 12 278 Feb 23
1998
LOWEST DAILY MEAN .13 Aug 30 .00 Jul 6 .00 Jul 7
1996
ANNUAL SEVEN-DAY MINIMUM .15 Sep 14 .00 Jul 6 .00 Jul 7
1996
INSTANTANEOUS PEAK FLOW 11 Apr 12 584 Feb 23
1998
INSTANTANEOUS PEAK STAGE 2.24 Apr 12 3.88 Feb 23
1998
ANNUAL RUNOFF (AC-FT) 4590 414 1940
10 PERCENT EXCEEDS 15 1.2 7.0
50 PERCENT EXCEEDS 1.1 .48 .44
90 PERCENT EXCEEDS .24 .00 .00
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