11318500 SOUTH FORK MOKELUMNE RIVER NEAR WEST POINT, CA
LOCATION.--Lat 38°22'06", long 120°32'40", in SE 1/4 SE 1/4 sec.16, T.6 N., R.13 E., Calaveras County, Hydrologic
Unit 18040012, on right bank 500 ft upstream from highway bridge, 2.4 mi southwest of West Point, and 2.5 mi
upstream from mouth.
DRAINAGE AREA.--75.1 mi2.
PERIOD OF RECORD.--October 1933 to current year.
REVISED RECORDS.--WSP 1315-A: 1934(M). WSP 1930: Drainage area.
GAGE.--Water-stage recorder. Elevation of gage is 1,950 ft above sea level, from topographic map. October 1933
to Sept. 19, 1957, at site 1,100 ft downstream at different datum.
REMARKS.--Records good. The Middle Fork Ditch can divert 10 ft3/s from the Middle Fork Mokelumne River which,
due to leakage, delivers about 5 ft3/s to the Licking Fork Mokelumne River. There are two pumps with a
combined capacity of 8.9 ft3/s that can pump water to Jeff Davis Reservoir upstream from the station. There
are other small diversions upstream from the station for irrigation and domestic use. See schematic diagram
of Mokelumne River basin.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 7,300 ft3/s, Feb. 19, 1986, gage height, 12.48 ft, from rating
curve extended above 2,700 ft3/s on basis of slope-area measurement of peak flow; no flow Aug. 6, 7, Aug. 12
to Sept. 26, 1934.
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 500 ft3/s, or maximum:
Discharge Gage height Discharge Gage height
Date Time (ft3/s) (ft) Date Time (ft3/s) (ft)
Jan. 25 0045 858 5.69 Feb. 20 0015 1,460 6.76
Jan. 27 2230 589 5.07 Mar. 05 0315 937 5.85
Feb. 05 0315 907 5.79
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 16 10 14 35 109 175 273 120 78 40 16 8.6
2 15 11 14 30 92 170 322 114 75 41 15 8.1
3 14 13 14 27 82 179 258 109 72 39 15 8.3
4 14 15 17 25 336 423 227 103 69 38 15 8.1
5 14 15 19 24 758 738 208 98 67 35 15 8.5
6 14 15 16 23 417 467 198 95 64 32 15 8.7
7 14 15 16 22 283 375 192 90 63 30 14 8.7
8 14 15 16 22 230 318 184 86 61 30 14 8.2
9 14 15 15 21 202 293 179 84 59 29 14 8.1
10 14 15 15 21 185 279 172 81 58 28 13 8.2
11 14 14 30 18 172 297 162 78 56 28 16 7.8
12 14 14 143 16 166 371 155 74 55 27 15 7.8
13 15 14 98 16 168 328 145 72 54 26 12 9.2
14 14 14 58 16 162 281 137 70 52 26 13 11
15 14 14 61 17 153 262 133 82 51 25 12 11
16 13 14 44 171 162 249 277 275 49 24 12 11
17 11 13 31 196 180 242 288 174 48 24 11 11
18 11 8.9 26 106 187 243 367 210 46 23 11 9.3
19 10 8.9 24 155 636 243 282 168 45 22 12 8.7
20 9.7 9.0 23 88 1070 238 259 143 44 22 12 8.1
21 e9.5 8.9 21 106 1060 230 232 133 43 21 12 8.0
22 9.6 9.3 20 75 720 220 211 131 42 20 11 8.0
23 9.8 9.2 21 64 493 202 195 118 41 17 11 7.4
24 9.9 9.2 20 215 406 185 184 114 41 17 10 7.3
25 10 9.1 19 409 331 175 175 109 44 18 11 7.2
26 10 12 19 134 274 161 166 101 56 18 11 7.2
27 11 11 19 288 234 155 157 97 59 17 11 8.8
28 10 10 21 306 205 283 147 95 47 17 10 11
29 9.9 9.9 24 148 187 210 135 92 43 17 9.9 11
30 10 11 62 106 --- 184 125 89 41 16 10 11
31 10 --- 43 111 --- 172 --- 84 --- 16 9.3 ---
TOTAL 378.4 362.4 983 3011 9660 8348 6145 3489 1623 783 388.2 265.3
MEAN 12.2 12.1 31.7 97.1 333 269 205 113 54.1 25.3 12.5 8.84
MAX 16 15 143 409 1070 738 367 275 78 41 16 11
MIN 9.5 8.9 14 16 82 155 125 70 41 16 9.3 7.2
AC-FT 751 719 1950 5970 19160 16560 12190 6920 3220 1550 770 526
e Estimated.
11318500 SOUTH FORK MOKELUMNE RIVER NEAR WEST POINT, CA--Continued
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1934 - 1996, BY WATER YEAR (WY)
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
MEAN 13.6 30.9 71.2 124 169 189 183 121 46.1 21.3 12.3 10.1
MAX 41.6 270 465 661 959 825 704 461 163 62.9 36.1 31.6
(WY) 1983 1951 1956 1969 1986 1983 1982 1995 1983 1983 1952 1983
MIN 1.65 3.21 2.83 1.85 2.53 11.3 7.48 10.9 4.49 1.00 .039 .13
(WY) 1989 1991 1991 1991 1991 1977 1977 1977 1992 1934 1934 1934
SUMMARY STATISTICS FOR 1995 CALENDAR YEAR FOR 1996 WATER YEAR WATER YEARS 1934 - 1996
ANNUAL TOTAL 67880.8 35436.3
ANNUAL MEAN 186 96.8 82.2
HIGHEST ANNUAL MEAN 264 1983
LOWEST ANNUAL MEAN 6.14 1977
HIGHEST DAILY MEAN 2630 Mar 11 1070 Feb 20 5780 Feb 17 1986
LOWEST DAILY MEAN 8.9 Nov 18 7.2 Sep 25 .00 Aug 6 1934
ANNUAL SEVEN-DAY MINIMUM 9.1 Nov 18 7.6 Sep 20 .00 Aug 12 1934
INSTANTANEOUS PEAK FLOW 1460 Feb 20 7300 Feb 19 1986
INSTANTANEOUS PEAK STAGE 6.76 Feb 20 12.48 Feb 19 1986
ANNUAL RUNOFF (AC-FT) 134600 70290 59530
10 PERCENT EXCEEDS 475 258 211
50 PERCENT EXCEEDS 61 30 27
90 PERCENT EXCEEDS 13 9.9 5.8
USGS Water Resources of California
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