10270800 SOUTH FORK BISHOP CREEK BELOW SOUTH LAKE, NEAR BISHOP, CA
LOCATION.-Lat 37°10'38", long 118°33'44", unsurveyed, T.9 S., R.31 E., Inyo County, Hydrologic Unit
18090102, Inyo National Forest, on right bank, near weir on Weir Lake, 0.3 mi downstream from South Lake, and
15.7 mi southwest of Bishop.
DRAINAGE AREA.-13.4 mi2.
PERIOD OF RECORD.-October 1990 to current year. Unpublished records prior to October 1990 available in files of
Southern California Edison Co.
GAGE.-Water-stage recorder and sharp-crested weir. Elevation of gage is 9,580 ft above sea level, from
topographic map.
REMARKS.-Flow regulated by South Lake (station 10270700). Green Creek Conduit (station 10270680) diverts water
into basin at South Lake. Water is used for power development downstream. See schematic diagram of Bishop Creek
Basin.
COOPERATION.-Records collected by Southern California Edison Co., 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, 142 ft3/s, July 31, 1995, gage height, 1.44 ft;
minimum daily, 6.7 ft3/s, Apr. 4, 1994.
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 34 16 36 34 e22 21 34 29 20 14 36 30
2 34 35 36 34 e22 21 33 28 17 14 35 30
3 34 65 36 34 22 20 33 28 18 14 33 30
4 34 65 36 34 22 21 32 28 18 14 27 29
5 34 57 36 34 22 21 36 30 18 15 25 29
6 34 47 36 34 22 21 36 29 18 15 25 29
7 34 40 36 34 22 21 36 29 17 15 25 29
8 33 40 36 34 22 21 36 29 17 15 25 30
9 33 40 36 34 22 21 36 30 17 15 31 29
10 33 39 36 34 23 21 36 30 17 15 33 29
11 33 39 36 34 23 21 36 30 17 15 32 29
12 33 38 36 28 22 21 36 23 17 16 32 29
13 33 37 36 23 22 21 35 20 17 16 31 28
14 33 37 36 23 22 20 34 20 17 16 32 28
15 33 37 36 22 22 20 34 20 17 16 37 28
16 33 37 36 22 22 20 34 20 18 16 37 28
17 33 37 36 22 22 20 30 20 18 16 38 27
18 33 37 35 22 21 20 29 17 18 16 38 28
19 33 37 35 22 21 20 26 16 18 16 38 29
20 33 37 36 e22 22 20 25 16 18 17 38 29
21 33 36 36 e22 22 20 24 16 18 17 33 29
22 26 36 36 e22 22 20 24 16 18 20 30 24
23 16 36 36 e22 22 20 24 16 18 30 30 34
24 15 36 36 e22 21 27 29 16 18 32 30 37
25 15 36 36 e22 21 31 29 17 18 33 30 37
26 15 36 36 e22 21 31 29 17 18 35 30 37
27 15 36 35 e22 21 31 28 16 18 34 30 37
28 15 36 35 e22 21 31 29 16 16 35 30 37
29 15 36 35 e22 --- 30 29 16 14 35 30 37
30 15 36 35 e22 --- 30 29 21 14 35 30 36
31 16 --- 34 e22 --- 31 --- 22 --- 35 30 ---
TOTAL 863 1177 1108 822 611 714 941 681 522 647 981 922
MEAN 27.8 39.2 35.7 26.5 21.8 23.0 31.4 22.0 17.4 20.9 31.6 30.7
MAX 34 65 36 34 23 31 36 30 20 35 38 37
MIN 15 16 34 22 21 20 24 16 14 14 25 24
AC-FT 1710 2330 2200 1630 1210 1420 1870 1350 1040 1280 1950 1830
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1991 - 1999, BY WATER YEAR (WY)
MEAN 25.4 22.6 23.4 25.0 31.2 30.7 26.9 22.1 18.4 35.3 43.9 34.3
MAX 41.6 41.1 35.7 35.8 54.2 61.6 57.4 36.7 28.8 61.4 87.7 47.6
(WY) 1998 1998 1999 1993 1993 1997 1996 1996 1996 1995 1995 1998
MIN 10.8 10.6 9.98 7.59 7.45 7.75 7.74 10.6 7.70 9.45 20.5 26.4
(WY) 1991 1991 1991 1991 1991 1991 1992 1994 1991 1991 1991 1991
SUMMARY STATISTICS FOR 1998 CALENDAR YEAR FOR 1999 WATER YEAR WATER YEARS 1991 - 1999
ANNUAL TOTAL 13311 9989
ANNUAL MEAN 36.5 27.4 28.3
HIGHEST ANNUAL MEAN 38.7 1995
LOWEST ANNUAL MEAN 12.4 1991
HIGHEST DAILY MEAN 117 Jul 26 65 Nov 3 139 Jul 31
1995
LOWEST DAILY MEAN 15 Apr 28 14 Jun 29 6.7 Apr 4
1994
ANNUAL SEVEN-DAY MINIMUM 15 Apr 28 14 Jun 29 6.9 Apr 9
1991
INSTANTANEOUS PEAK FLOW 67 Nov 5 142 Jul 31
1995
INSTANTANEOUS PEAK STAGE .88 Nov 5 1.44 Jul 31
1995
ANNUAL RUNOFF (AC-FT) 26400 19810 20480
10 PERCENT EXCEEDS 65 36 54
50 PERCENT EXCEEDS 34 29 23
90 PERCENT EXCEEDS 16 16 9.4
e Estimated.
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