10287289 RUSH CREEK FLUME BELOW AGNEW LAKE, NEAR JUNE LAKE, CA
LOCATION.-Lat 37°45'33", long 119°07'47", in NE 1/4 SW 1/4 sec.20, T.2 S., R.26 E., Mono County,
Hydrologic Unit 18090101, Inyo National Forest, on left bank, 600 ft downstream from Agnew Lake Dam, and 3.4 mi
southwest of town of June Lake.
DRAINAGE AREA.-23.3 mi2.
PERIOD OF RECORD.-October 1990 to current year. If records for Rush Creek Powerplant Tailrace (station 10287300)
are combined with this record, a record equivalent to that published since October 1951 as Rush Creek below Agnew
Lake (station 10287290) can be obtained. Monthly and yearly mean discharges prior to October 1969, published in
WSP 2127.
GAGE.-Water-stage recorder and Parshall flume. A 4-ft Cipolletti weir is set in the Parshall flume at times.
Elevation of gage is 8,440 ft above sea level, from topographic map.
REMARKS.-Flow regulated for power development by Waugh, Gem, and Agnew Lakes (stations 10287260, 10287280, and
10287285). Most of the water is diverted at either Gem or Agnew Lakes to Rush Creek Powerplant Tailrace via Rush
Creek Powerplant.
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, 441 ft3/s, July 30, 1995, gage height, 4.90 ft; no
flow for many days in most years.
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 1.8 2.8 e1.3 e.62 .69 .37 1.5 1.7 2.5 99 e1.5 1.4
2 1.9 2.8 1.3 .62 .69 .37 1.5 1.7 2.6 107 e1.5 1.3
3 1.8 2.8 1.1 .62 .64 .37 1.5 e1.7 2.7 96 e1.5 1.3
4 1.8 7.4 1.2 .63 .62 .37 1.5 e1.8 2.5 66 e1.5 1.3
5 1.8 11 1.4 .63 .62 .37 1.5 1.9 2.2 42 1.6 1.3
6 1.8 11 e1.3 .63 .62 .37 1.5 1.9 2.1 31 1.3 1.4
7 1.8 11 e1.3 .62 .62 .35 1.5 1.9 2.1 26 1.2 1.3
8 1.8 11 e1.3 .62 .61 .31 1.5 2.0 3.5 28 1.2 1.5
9 1.8 11 e1.2 .59 .55 .31 1.5 1.9 7.0 26 1.2 1.8
10 1.8 10 e1.2 .65 .55 .28 1.4 2.0 8.4 21 1.2 1.6
11 1.8 10 e1.2 .59 .55 .26 1.4 1.9 11 20 1.2 1.4
12 1.8 10 e1.2 .55 .55 .26 1.4 1.9 12 23 1.2 1.4
13 1.8 9.9 e1.1 .55 .55 .26 1.4 2.0 13 21 1.8 1.8
14 1.8 9.6 e1.1 .55 .55 .26 1.4 1.9 15 25 1.4 1.4
15 1.8 9.3 e1.1 .66 .55 .26 1.4 2.0 15 24 1.2 1.5
16 1.8 4.2 e1.1 .57 .51 .26 1.4 2.0 14 16 1.2 2.0
17 1.8 1.6 e.99 .69 .49 .37 e1.4 2.1 14 8.7 1.3 2.2
18 1.8 1.0 e.68 .87 .49 .62 e1.4 2.1 14 2.7 1.4 1.7
19 1.8 1.0 e.57 e.88 .49 .65 e1.5 2.0 13 2.2 1.2 1.5
20 1.8 .91 e.76 .90 .43 .70 e1.5 2.1 13 2.4 1.4 1.7
21 2.7 .83 .77 e.91 .43 .69 e1.5 2.2 9.8 1.3 1.4 1.9
22 3.8 .77 e.77 e.92 .43 .68 e1.6 2.1 10 1.2 1.4 2.1
23 3.7 .96 e.77 e.91 .43 .84 1.6 2.1 12 1.8 1.6 2.4
24 3.5 .93 e.77 e.91 .43 .80 1.6 2.2 11 1.2 1.4 2.3
25 3.4 .62 e.77 e.90 .39 .77 1.7 2.3 8.4 1.1 1.4 1.9
26 3.3 .72 e.73 e.91 .37 e.80 1.8 2.2 11 1.1 1.4 2.1
27 3.2 .66 e.69 e.90 .37 e.80 1.7 2.3 41 e1.5 1.3 1.8
28 3.1 .74 e.69 .90 .37 e.80 e1.7 2.3 73 e1.5 1.2 1.8
29 3.1 .88 e.65 .77 --- .80 1.6 2.3 100 e1.5 1.6 2.0
30 3.0 1.3 e.64 .69 --- .79 1.6 2.5 97 e1.5 4.1 2.5
31 3.0 --- e.63 .69 --- e1.0 --- 2.5 --- e1.5 1.4 ---
TOTAL 71.9 146.72 30.28 22.45 14.59 16.14 45.5 63.5 542.8 702.2 45.2 51.6
MEAN 2.32 4.89 .98 .72 .52 .52 1.52 2.05 18.1 22.7 1.46 1.72
MAX 3.8 11 1.4 .92 .69 1.0 1.8 2.5 100 107 4.1 2.5
MIN 1.8 .62 .57 .55 .37 .26 1.4 1.7 2.1 1.1 1.2 1.3
AC-FT 143 291 60 45 29 32 90 126 1080 1390 90 102
a 4740 2410 2790 2740 2690 2980 1540 2780 2890 5360 1610 2230
e Estimated.
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1991 - 1999, BY WATER YEAR (WY)
MEAN 1.87 2.00 .80 1.04 .74 .85 1.42 1.23 17.3 52.9 11.6 .94
MAX 3.06 4.89 1.37 4.72 1.59 1.70 2.99 3.89 81.8 218 89.8 1.85
(WY) 1996 1999 1995 1997 1997 1998 1996 1998 1995 1995 1995 1998
MIN .085 .39 .23 .27 .19 .13 .040 .045 .049 .031 .005 .015
(WY) 1995 1994 1991 1991 1991 1995 1994 1994 1992 1994 1994 1994
SUMMARY STATISTICS FOR 1998 CALENDAR YEAR FOR 1999 WATER YEAR WATER YEARS 1991 - 1999
ANNUAL TOTAL 5689.57 1752.88
ANNUAL MEAN 15.6 4.80 7.80
HIGHEST ANNUAL MEAN 33.6 1995
LOWEST ANNUAL MEAN .41 1994
HIGHEST DAILY MEAN 295 Jul 21 107 Jul 2 397 Jul 30
1995
LOWEST DAILY MEAN .50 Jan 3 .26 Mar 11 .00 Oct 27
1990
ANNUAL SEVEN-DAY MINIMUM .50 Jan 3 .26 Mar 10 .00 Mar 12
1991
INSTANTANEOUS PEAK FLOW 121 Jul 2 441 Jul 30
1995
INSTANTANEOUS PEAK STAGE 3.36 Jul 2 4.90 Jul 30
1995
ANNUAL RUNOFF (AC-FT) 11290 3480 5650
ANNUAL DIVERSION (AC-FT) a 43740 34760
10 PERCENT EXCEEDS 11 11 4.7
50 PERCENT EXCEEDS 1.8 1.5 .77
90 PERCENT EXCEEDS .70 .55 .06
a Diversion, in acre-feet, to Rush Creek Powerplant Tailrace, provided by Southern California Edison Co.
USGS Water Resources of California
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