10263000 MOJAVE RIVER AT AFTON, CA
LOCATION.-Lat 35°02'14", long 116°23'00", in NW 1/4 SE 1/4 sec.18, T.11 N., R.6 E., San Bernardino County, Hydrologic Unit 18090208, on
right bank side of right pier of Union Pacific Railroad bridge, 0.3 mi west of Afton, and 63 mi east of Barstow.
DRAINAGE AREA.-2,121 mi2.
PERIOD OF RECORD.-October 1929 to September 1932, October 1952 to current year. Records for water year 1930 incomplete; yearly estimate
published in WSP 1314. Records for water years 1979 and 1980 incomplete; discharge measurements only were published at that time.
REVISED RECORDS.-WSP 1564: 1931.
GAGE.-Water-stage recorder. Datum of gage is 1,398.15 ft above sea level. Dec. 21, 1929, to Sept. 30, 1932, at site 1.7 mi downstream at different
datum; October 1952 to May 1978, at datum 2 ft higher.
REMARKS.-Records poor. Natural flow affected by ground-water withdrawals, diversions, municipal use, and storage in reservoirs 100 mi
upstream. For description of upstream reservoirs see Mojave River at Barstow (station 10262500). See schematic diagram of Mojave River
Basin.
EXTREMES FOR PERIOD OF RECORD.-Maximum discharge, 18,000 ft3/s, Jan. 26, 1969, gage height, 12.40 ft (present datum), from rating
curve extended above 3,200 ft3/s on basis of slope-area measurement of peak flow; no flow at times during many years.
EXTREMES FOR CURRENT YEAR.-Peak discharges greater than base discharge of 100 ft3/s, or maximum:
Discharge Gage height Discharge Gage height
Date Time (ft3/s) (ft) Date Time (ft3/s) (ft)
July 23 1430 1,020 4.47
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 .39 .64 .92 1.0 1.1 .96 .93 .51 .06 .02 .00 .18
2 .40 .66 .94 1.1 1.1 .86 .96 .47 .06 .04 .00 .20
3 .42 .64 .92 1.1 1.1 .84 1.0 .47 .07 .03 .00 .28
4 .42 .65 .96 .96 1.1 .84 1.1 .41 .06 .02 .00 .32
5 .43 .65 1.0 1.1 1.1 .84 1.0 .38 .07 .01 .00 .30
6 .44 .64 .97 1.3 1.1 .88 .97 .34 .08 .00 .00 .27
7 .44 .67 .96 1.1 1.1 .84 .96 .33 .09 .00 .00 .23
8 .44 .67 .96 1.1 1.1 .84 .96 .32 .08 .00 .00 .22
9 .45 .68 1.0 1.1 1.1 .84 .94 .31 .09 .00 .00 .23
10 .44 .70 1.1 1.1 1.1 .85 .94 .30 .09 .00 .00 .21
11 .44 .73 1.1 1.1 1.1 .86 .96 .29 .07 .00 .00 .19
12 .45 .71 1.1 1.2 .98 .84 .95 .29 .06 .00 .00 .20
13 .45 .74 1.0 1.3 .96 .84 .93 .22 .07 .00 .00 .23
14 .46 .74 1.0 1.1 .96 .82 .94 .17 .09 .00 .00 .21
15 .48 .74 .97 1.1 1.0 .93 .94 .16 .10 .00 .02 .31
16 .46 .74 1.0 1.2 .97 .96 .88 .17 .10 .00 .02 .30
17 .48 .74 1.1 1.1 1.0 .94 .75 .17 .09 .00 .04 .30
18 .51 .74 1.0 1.2 1.1 .92 .69 .14 .07 .00 .04 .25
19 .52 .76 1.0 1.2 1.1 .92 .67 .14 .05 .00 .05 .26
20 .51 .76 1.1 1.2 1.1 .94 .63 .18 .03 .00 .05 .27
21 .53 1.0 1.1 1.2 .94 .93 .61 .16 .01 .00 .06 .28
22 .54 1.1 1.1 1.2 .93 .96 .59 .13 .01 .04 .06 .28
23 .58 .92 1.0 1.2 .96 .96 .57 .11 .01 105 .06 .30
24 .59 .87 .93 1.1 .96 .94 .59 .12 .02 13 .05 .31
25 .58 .91 .96 1.1 .96 .86 .63 .12 .03 .00 .06 3.2
26 .58 .91 .96 1.1 .96 .89 .64 .12 .01 .00 .07 1.4
27 .58 .89 .96 1.1 .96 .89 .62 .11 .01 .00 .07 .51
28 .60 .92 .96 1.0 1.0 .84 .59 .12 .00 .00 .08 .50
29 .62 .94 .97 1.1 --- .84 .58 .11 .00 .00 .09 .44
30 .66 .89 1.0 1.0 --- .84 .56 .09 .01 .00 .11 .44
31 .67 --- 1.0 1.1 --- .84 --- .08 --- .00 .13 ---
TOTAL 15.56 23.35 31.04 34.86 28.94 27.35 24.08 7.04 1.59 118.16 1.06 12.62
MEAN .50 .78 1.00 1.12 1.03 .88 .80 .23 .053 3.81 .034 .42
MAX .67 1.1 1.1 1.3 1.1 .96 1.1 .51 .10 105 .13 3.2
MIN .39 .64 .92 .96 .93 .82 .56 .08 .00 .00 .00 .18
AC-FT 31 46 62 69 57 54 48 14 3.2 234 2.1 25
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1930 - 1997, BY WATER YEAR (WY)
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
MEAN .77 .97 2.85 14.2 45.9 18.6 2.97 .68 .42 .63 1.40 .80
MAX 2.97 2.29 63.9 347 876 415 56.4 1.80 1.58 3.81 18.0 4.30
(WY) 1993 1981 1966 1969 1993 1978 1969 1931 1981 1997 1984 1988
MIN .000 .000 .21 .34 .59 .22 .20 .099 .000 .000 .000 .000
(WY) 1967 1969 1978 1976 1975 1975 1977 1977 1976 1966 1966 1966
SUMMARY STATISTICS FOR 1996 CALENDAR YEAR FOR 1997 WATER YEAR WATER YEARS 1930 - 1997
ANNUAL TOTAL 329.61 325.65
ANNUAL MEAN .90 .89 7.29
HIGHEST ANNUAL MEAN 100 1969
LOWEST ANNUAL MEAN .22 1975
HIGHEST DAILY MEAN 49 Jul 14 105 Jul 23 10000 Feb 20 1993
LOWEST DAILY MEAN .00 Jul 5 .00 Jun 28 .00 Jun 28 1961
ANNUAL SEVEN-DAY MINIMUM .00 Jul 4 .00 Jul 6 .00 Jul 14 1961
INSTANTANEOUS PEAK FLOW 1020 Jul 23 18000 Jan 26 1969
INSTANTANEOUS PEAK STAGE 4.47 Jul 23 12.40 Jan 26 1969
ANNUAL RUNOFF (AC-FT) 654 646 5280
10 PERCENT EXCEEDS 1.0 1.1 1.6
50 PERCENT EXCEEDS .55 .60 .80
90 PERCENT EXCEEDS .05 .00 .05
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Last modified: Wed Mar 10 14:06:24 PST 1999