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).
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 14 2215 680 4.03 Sept. 7 2100 322 3.44
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 .18 .62 .99 .69 1.1 .99 .87 .34 .14 .07 .03 .08
2 .19 .63 .91 .69 1.0 1.0 .81 .29 .13 .05 .02 .05
3 .20 .65 .84 .70 .96 1.0 .79 .24 .12 .03 .01 .05
4 .17 .66 .87 .74 .88 .92 .77 .23 .10 .01 .02 .09
5 .20 .67 .87 .71 .83 .95 .68 .21 .08 .00 .05 .15
6 .24 .66 .88 .72 .78 .92 .72 .20 .06 .00 .06 .16
7 .26 .67 .90 .74 .80 .96 .73 .19 .06 .01 .08 41
8 .27 .67 .82 .77 .80 1.0 .68 .16 .05 .01 .08 13
9 .27 .69 .78 .77 .79 1.1 .62 .14 .05 .00 .07 .34
10 .29 .68 .80 .80 .77 1.1 .59 .15 .03 .00 .08 .31
11 .31 .68 .84 .80 .76 1.0 .57 .16 .02 .01 .07 .30
12 .31 .69 .84 .80 .76 .96 .58 .15 .02 .01 .07 .29
13 .32 .70 .84 .96 .74 .97 .57 .12 .03 .00 .08 .29
14 .34 .73 .76 .96 .75 1.0 .61 .10 .03 49 .07 .31
15 .37 .71 .73 .99 .74 1.0 .64 .10 .03 39 .08 .31
16 .38 .71 .76 1.0 .74 1.0 .63 .11 .03 .15 .10 .31
17 .39 .73 .74 .93 .75 1.0 .59 .12 .02 .12 .06 .32
18 .42 .77 .76 .88 .79 1.1 .55 .12 .02 .10 .04 .32
19 .43 .79 .77 .91 .83 1.1 .49 .12 .02 .09 .07 .33
20 .45 .81 .70 .88 .89 1.0 .51 .13 .02 .09 .09 .34
21 .46 .84 .70 .92 1.1 1.0 .50 .13 .01 .08 .10 .36
22 .44 .87 .70 .95 1.0 .93 .50 .12 .01 .07 .11 .34
23 .51 .86 .84 .88 .90 .89 .48 .13 .03 .06 .13 .33
24 .56 .82 .79 .92 .93 .93 .44 .17 .02 .04 .14 .34
25 .58 .82 .76 .93 1.0 .94 .39 .29 .02 .04 .14 .34
26 .59 .87 .69 .84 1.1 .92 .39 .26 .05 .05 .12 .34
27 .60 .81 .69 .89 .96 .98 .36 .23 .08 .07 .11 .35
28 .61 .81 .70 .88 .96 .82 .34 .17 .09 .09 .12 .36
29 .62 .90 .74 .86 .96 .80 .35 .16 .09 .09 .13 .39
30 .61 .96 .74 .85 --- .88 .37 .14 .08 .07 .14 .38
31 .61 --- .78 .96 --- .89 --- .14 --- .05 .13 ---
TOTAL 12.18 22.48 24.53 26.32 25.37 30.05 17.12 5.32 1.54 89.46 2.60 61.88
MEAN .39 .75 .79 .85 .87 .97 .57 .17 .051 2.89 .084 2.06
MAX .62 .96 .99 1.0 1.1 1.1 .87 .34 .14 49 .14 41
MIN .17 .62 .69 .69 .74 .80 .34 .10 .01 .00 .01 .05
AC-FT 24 45 49 52 50 60 34 11 3.1 177 5.2 123
10263000 MOJAVE RIVER AT AFTON, CA--Continued
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1930 - 1996, BY WATER YEAR (WY)
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
MEAN .78 .97 2.89 14.5 46.9 19.0 3.02 .69 .43 .56 1.43 .80
MAX 2.97 2.29 63.9 347 876 415 56.4 1.80 1.58 3.13 18.0 4.30
(WY) 1993 1981 1966 1969 1993 1978 1969 1931 1981 1967 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 1995 CALENDAR YEAR FOR 1996 WATER YEAR WATER YEARS 1930 - 1996
ANNUAL TOTAL 176.54 318.85
ANNUAL MEAN .48 .87 7.43
HIGHEST ANNUAL MEAN 100 1969
LOWEST ANNUAL MEAN .22 1975
HIGHEST DAILY MEAN 7.0 Jan 11 49 Jul 14 10000 Feb 20 1993
LOWEST DAILY MEAN .00 Jul 28 .00 Jul 5 .00 Jun 28 1961
ANNUAL SEVEN-DAY MINIMUM .00 Jul 28 .00 Jul 4 .00 Jul 14 1961
INSTANTANEOUS PEAK FLOW 680 Jul 14 18000 Jan 26 1969
INSTANTANEOUS PEAK STAGE 4.03 Jul 14 12.40 Jan 26 1969
ANNUAL RUNOFF (AC-FT) 350 632 5380
10 PERCENT EXCEEDS .92 .96 1.6
50 PERCENT EXCEEDS .43 .51 .80
90 PERCENT EXCEEDS .02 .05 .06
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