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 28 2330 564 4.10
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 .20 e.37 .52 .74 .64 .64 .74 1.1 .26 .08 .21 .21
2 .20 e.37 .56 .74 .64 .59 .77 .80 .57 .07 .22 .16
3 .19 e.39 .56 .74 .64 .64 .77 .68 .44 .07 .22 .17
4 .19 e.41 .56 .74 .65 .64 .98 .61 .44 .07 .19 .19
5 .17 e.46 .56 .77 .72 .64 .86 .56 .40 .08 .18 .19
6 .17 e.46 .62 .84 .64 .64 .79 .55 .37 .08 .17 .17
7 .19 e.47 .64 .84 .64 .64 .78 .51 .28 .08 .19 .17
8 e.19 e.50 .64 .84 .64 .64 .74 .45 .25 .46 .20 .16
9 e.22 e.51 .64 .84 .64 .64 .74 .44 .26 .31 .19 .17
10 e.23 e.52 .64 .84 .62 .66 .74 .42 .26 .22 .18 .18
11 e.25 e.52 .64 .78 .56 .64 .90 .44 .27 .17 .17 .16
12 e.26 e.48 .64 .74 .56 .64 1.5 .42 .20 .25 .16 .19
13 e.27 .42 .67 .74 .59 .64 1.2 .36 .19 .19 .17 .22
14 e.27 .42 .74 .74 .64 .64 .90 .32 .17 .38 .15 .16
15 e.27 .42 .74 .74 .64 .67 .78 .36 .16 .28 .14 .16
16 e.28 .42 .65 .79 .64 .67 .74 .37 .15 .14 .16 .20
17 e.28 .47 .69 .84 .64 .74 .72 .36 .14 .12 .15 .21
18 e.28 .49 .74 .84 .64 .74 .68 .34 .14 .11 .15 .20
19 e.29 .49 .74 .84 .64 .69 .61 .31 .13 .11 .11 .21
20 e.29 .49 .69 .84 .61 .72 .56 .32 .13 .11 .13 .21
21 e.31 .49 .64 .74 .60 .78 .52 .35 .12 .12 .14 .23
22 e.33 .53 .64 .67 .56 .84 .57 .36 .13 .12 .13 .34
23 e.35 .56 .63 .68 .56 .82 .67 .36 .13 .11 .13 .36
24 e.38 .56 .62 .74 .56 .80 .71 .43 .12 .10 .13 .31
25 e.39 .56 .67 .74 .60 .84 .77 .48 .09 .12 .14 .25
26 e.40 .52 .74 .77 .57 .84 .59 .36 .09 .13 .14 .21
27 e.39 .49 .74 .82 .59 .81 .53 .30 .10 .12 .13 .24
28 e.39 .49 .74 .74 .60 .74 .54 .31 .11 27 .13 .24
29 e.39 .49 .74 .74 --- .74 1.2 .27 .08 87 .15 .26
30 e.38 .49 .74 .70 --- .74 1.2 .26 .07 .38 4.5 .29
31 e.38 --- .78 .64 --- .77 --- .26 --- .25 .28 ---
TOTAL 8.78 14.26 20.56 23.80 17.27 21.88 23.80 13.46 6.25 118.83 9.44 6.42
MEAN .28 .48 .66 .77 .62 .71 .79 .43 .21 3.83 .30 .21
MAX .40 .56 .78 .84 .72 .84 1.5 1.1 .57 87 4.5 .36
MIN .17 .37 .52 .64 .56 .59 .52 .26 .07 .07 .11 .16
AC-FT 17 28 41 47 34 43 47 27 12 236 19 13
e Estimated.
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1930 - 1999, BY WATER YEAR (WY)
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
MEAN .76 .95 2.76 13.6 44.2 17.9 2.87 .67 .41 .69 1.35 .88
MAX 2.97 2.29 63.9 347 876 415 56.4 1.80 1.58 3.83 18.0 5.46
(WY) 1993 1981 1966 1969 1993 1978 1969 1931 1981 1999 1984 1998
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 1998 CALENDAR YEAR FOR 1999 WATER YEAR WATER YEARS 1930 - 1999
ANNUAL TOTAL 635.93 284.75
ANNUAL MEAN 1.74 .78 7.04
HIGHEST ANNUAL MEAN 100 1969
LOWEST ANNUAL MEAN .22 1975
HIGHEST DAILY MEAN 162 Feb 25 87 Jul 29 10000 Feb 20
1993
LOWEST DAILY MEAN .00 Jul 6 .07 Jun 30 .00 Jun 28
1961
ANNUAL SEVEN-DAY MINIMUM .00 Jul 6 .07 Jun 29 .00 Jul 14
1961
INSTANTANEOUS PEAK FLOW 564 Jul 28 18000 Jan 26
1969
INSTANTANEOUS PEAK STAGE 4.10 Jul 28 12.40 Jan 26
1969
ANNUAL RUNOFF (AC-FT) 1260 565 5100
10 PERCENT EXCEEDS .93 .77 1.6
50 PERCENT EXCEEDS .40 .47 .76
90 PERCENT EXCEEDS .01 .13 .06
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