10290400  LOWER TWIN LAKE NEAR BRIDGEPORT, CA

LOCATION.-Lat 38°10'05", long 119°19'33", in NE 1/4 NE 1/4 sec.33, T.4 N., R.24 E., Mono County, Hydrologic Unit 16050301, in Toiyabe National Forest, at outlet of lower lake dam on Robinson Creek, and 8 mi southwest of Bridgeport.
DRAINAGE AREA.-38.9 mi2.
PERIOD OF RECORD.-December 1961 to current year.
GAGE.-Non-recording gage.  Datum of gage is 7,205.45 ft above sea level (project datum of U.S. Indian Irrigation Service).
REMARKS.-Contents regulated by dam at outlet and by Upper Twin Lake.  Figures given herein represent usable contents.  Usable  contents, 4,010 acre-ft between elevations 7,190 ft, natural rim, and 7,200 ft, spillway crest.  One transarea diversion out of Tamarack Creek into Summers Creek. These data are reviewed and provided by the Nevada District Office, U.S. Geological Survey.
EXTREMES FOR PERIOD OF RECORD.-Maximum contents, 5,560 acre-ft, June 19, 1983, elevation, 7,203.58 ft; no contents, Nov. 17, 1966.
  EXTREMES FOR CURRENT YEAR-Maximum contents observed, 5,090 acre-ft, July 1, elevation, 7,202.52 ft; minimum observed,
  3,660 acre-ft, Nov. 5, elevation 7,199.16 ft.

      MONTHEND ELEVATION AND CONTENTS, IN FEET ABOVE SEA LEVEL, WATER YEAR OCTOBER 1997 TO SEPTEMBER 1998
  Date	Elevation
  (ft)	Contents
  (acre-ft)	Change in contents
  (acre-ft)
  September 30			7199.12		3,650		-
  October 31			7199.15		3,660		+10
  November 30			7199.99		4,010		+350
  December 31			7200.58		4,250		+240
CALENDAR YEAR 1997			-		-		+120
  January 31			7200.50		4,220		-30
  February 28			7200.52		4,230		+10
  March 31			7200.60		4,260		+30
  April 30			7201.02		4,440		+180
  May 31			7201.03		4,440		0
  June 30			7202.48		5,070		+630
  July 31			7201.82		4,780		-290
  August 31			7200.80		4,350		-430
  September 30			7200.58		4,250		-100
WATER YEAR 1998			-		-		+600
NOTE.-Monthend elevations are interpolated from readings made during the year.