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, 5,140 acre-ft, June 23, elevation, 7,202.63 ft; minimum observed,   
  2,840 acre-ft, Oct. 2, elevation 7,197.11 ft.

     MONTHEND ELEVATION AND CONTENTS, IN FEET ABOVE SEA LEVEL, WATER YEAR OCTOBER 1996 TO SEPTEMBER 1997 
  Date
  Elevation
  (feet)
  Contents
  (acre-feet)
  Change in contents
  (acre-feet)
	
	
	
  September 30...............................
	7197.22
	2,890
	-
  October   31...............................
	7197.56
	3,020
	+130
  November  30...............................
	7200.24
	4,110
	+1,090
  December  31...............................
	7200.82
	4,360
	+250
CALENDAR YEAR 1996.......................
	-
	-
	+230
  January   31...............................
	7201.10
	4,470
	+110
  February  28...............................
	7201.00
	4,430
	-40
  March     31...............................
	7201.06
	4,460
	+30
  April     30...............................
	7201.65
	4,710
	+250
  May       31...............................
	7202.21
	4,950
	+240
  June      30...............................
	7202.45
	5,050
	+100
  July      31...............................
	7201.60
	4,690
	-360
  August    31...............................
	7200.20
	4,100
	-590
  September 30...............................
	7199.12
	3,650
	-450
WATER YEAR 1997..........................
	-
	-
	+760
NOTE.-Monthend elevations are interpolated from readings made during the year.