10290300 UPPER TWIN LAKE NEAR BRIDGEPORT, CA
LOCATION.-Lat 38°09'15", long 119°20'58", in NW 1/4 NE 1/4 sec.5, T.3 N., R.24 E., Mono County,
Hydrologic Unit 16050301, in Toiyabe National Forest, at outlet of upper lake dam on Robinson Creek, and 10 mi
southwest of Bridgeport.
DRAINAGE AREA.-29.5 mi2.
PERIOD OF RECORD.-December 1961 to February 1964, September 1964 to current year.
GAGE.-Nonrecording gage. Datum of gage is 7,212.86 ft above sea level (project datum of U.S. Indian Irrigation
Service).
REMARKS.-Contents regulated by dam at outlet. Figures given herein represent usable contents. Usable contents,
2,070 acre-ft between elevations 7,200 ft, natural rim, and 7,207 ft, spillway crest. These data are reviewed and
provided by the Nevada District Office, U.S. Geological Survey.
EXTREMES FOR PERIOD OF RECORD.-Maximum contents observed, 2,990 acre-ft, July 7, 1983, elevation, 7,209.85 ft;
minimum observed, 30 acre-ft, Nov. 1, 1990, elevation, 7,200.11 ft.
EXTREMES OUTSIDE PERIOD OF RECORD.-No usable contents observed Oct. 17, 1961.
EXTREMES FOR CURRENT YEAR.-Maximum contents observed, 2,710 acre-ft, July 1, elevation, 7,208.99 ft; minimum
observed, 1,720 acre-ft, Nov. 2, elevation, 7,205.89 ft.
MONTHEND ELEVATION, IN FEET ABOVE SEA LEVEL, AND TOTAL CONTENTS, WATER YEAR OCTOBER 1998 TO SEPTEMBER 1999
Date Elevation
(ft) Contents
(acre-ft) Change in contents
(acre-ft)
September 30............................... 7207.70 2,290 -
October 31............................... 7206.00 1,750 -540
November 30............................... 7206.89 2,030 +280
December 31............................... 7207.21 2,140 +110
CALENDAR YEAR 1998....................... - - +40
January 31............................... 7207.25 2,150 +10
February 28............................... 7207.35 2,180 +30
March 31............................... 7207.27 2,160 -20
April 30............................... 7207.64 2,270 +110
May 31............................... 7208.92 2,680 +410
June 30............................... 7208.99 2,710 +30
July 31............................... 7208.03 2,400 -310
August 31............................... 7207.67 2,280 -120
September 30............................... 7207.47 2,220 -60
WATER YEAR 1999.......................... - - -70
NOTE.-Monthend elevations are interpolated from readings made during the year.
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