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, November 17, 1966.

EXTREMES FOR CURRENT YEAR--Maximum contents observed, 4,740 acre-ft, May 7, elevation, 7,201.73 ft; minimum
   observed, 3,820 acre-ft, November 29, elevation 7,199.55 ft.


       MONTHEND ELEVATION AND CONTENTS, IN FEET ABOVE SEA LEVEL, WATER YEAR OCTOBER 1995 TO SEPTEMBER 1996
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    Date                                                     Elevation        Contents       Change in contents
                                                                (ft)          (acre-ft)          (acre-ft)
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   September 30. . . . . . . . . . . . . . . . . . . . . . . 7,200.40  	         4,180	                 --
   October   31. . . . . . . . . . . . . . . . . . . . . . . 7,199.63            3,860                -320
   November  30. . . . . . . . . . . . . . . . . . . . . . . 7,199.58            3,840                 -20
   December  31. . . . . . . . . . . . . . . . . . . . . . . 7,200.29            4,130                +290

      CALENDAR YEAR 1995 . . . . . . . . . . . . . . . . . .    --                  --              +1,610

   January   31. . . . . . . . . . . . . . . . . . . . . . . 7,200.56            4,250                +120
   February  29. . . . . . . . . . . . . . . . . . . . . . . 7,200.68            4,300                 +50
   March     31. . . . . . . . . . . . . . . . . . . . . . . 7,200.83            4,360                 +60
   April     30. . . . . . . . . . . . . . . . . . . . . . . 7,201.58            4,680                +320
   May       31. . . . . . . . . . . . . . . . . . . . . . . 7,201.63            4,700                 +20
   June      30. . . . . . . . . . . . . . . . . . . . . . . 7,201.53            4,660                 -40
   July      31. . . . . . . . . . . . . . . . . . . . . . . 7,201.08            4,460                -200
   August    31. . . . . . . . . . . . . . . . . . . . . . . 7,199.32            3,730                -730
   September 30. . . . . . . . . . . . . . . . . . . . . . . 7,197.22            2,890                -840
                                                             __________________________________________________

      WATER YEAR 1996. . . . . . . . . . . . . . . . . . . . 	 --                  --              -1,290
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    NOTE.--Monthend elevations are interpolated from readings made during the year.