10287700  TIOGA LAKE NEAR LEE VINING, CA

LOCATION.--Lat 37°55'41", long 119°15'01", in SE 1/4 SE 1/4 sec.19, T.1 N., R.25 E., Mono County, Hydrologic
   Unit 18090101, Inyo National Forest, at left abutment of dam on Glacier Creek and 7.4 mi west of Lee Vining.

DRAINAGE AREA.--3.67 mi2.

PERIOD OF RECORD.--October 1990 to current year.  Unpublished records prior to October 1990 available in files of
   Southern California Edison Co.

GAGE.--Water-stage recorder.  Datum of gage is sea level (levels by Southern California Edison Co.).

REMARKS.--Reservoir is formed on natural lake by rock-fill dam completed in 1928.  Usable capacity, 1,254 acre-ft
   between elevations 9,626.72 ft, invert of outlet, and 9,650.28 ft, crest of spillway.  Figures given represent
   usable contents.  Water is used for power development downstream.

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.  Contents not
   rounded to U.S. Geological Survey standards.

EXTREMES FOR PERIOD OF RECORD.--Maximum contents, 1,284 acre-ft, June 13, 1996, elevation, 9,650.68 ft; minimum,
   88 acre-ft, several days, elevation, 9,628.95 ft.

EXTREMES FOR CURRENT YEAR.--Maximum contents, 1,284 acre-ft, June 13, elevation, 9,650.68 ft; minimum,
   108 acre-ft, Dec. 12, 13, elevation, 9,629.42 ft.

                         Capacity table (elevation, in feet, and contents, in acre-feet)
                    (Based on survey by Southern California Edison Co., dated Aug. 19, 1981)

					9,626.72	    0		9,640	  609
					9,630	  131		9,646	  962
					9,635	  356		9,652	1,383

                    RESERVOIR STORAGE (ACRE-FEET), WATER YEAR OCTOBER 1995 TO SEPTEMBER 1996
                                        DAILY OBSERVATION AT 2400 HOURS

DAY       OCT      NOV      DEC      JAN      FEB      MAR      APR      MAY      JUN      JUL      AUG      SEP

  1      1249      810      137      114      128     e146     e149     e265      574     1143     1258     1186
  2      1241      779      131      113      127     e150     e146     e266      638     1162     1257     1180
  3      1226      752      127      113      127     e147     e145     e268      718     1176     1255     1175
  4      1213      723      127      113      133     e145     e144     e270      798     1187     1256     1175
  5      1198      694      125      113      134     e145     e143     e272      877     1193     1254     1172

  6      1184      666      122      113      132     e145     e143     e275      965     1200     1254     1171
  7      1169      639      120      113      131     e145     e143     e274     1072     1209     1253     1168
  8      1155      612      119      112      129     e145     e144     e274     1169     1218     1251     1166
  9      1141      586      117      113      129     e145     e145     e274     1249     1230     1250     1163
 10      1127      561      121      113      129     e145     e146     e274     1280     1241     1249     1162

 11      1112      535      109      113      128     e146     e148     e274     1274     1265     1247     1158
 12      1099      511      108      113      128     e149     e148     e277     1277     1269     1254     1155
 13      1085      488      108      113      128     e146     e147     e286     1284     1267     1255     1156
 14      1070      463      127      113      128     e145     e147      299     1273     1271     1254     1154
 15      1057      439      134      114      127     e145     e149      371     1267     1267     1253     1145

 16      1044      418      146      121      128     e145     e149      418     1262     1265     1251     1120
 17      1030      395      155      121      128     e145     e149      433     1255     1261     1249     1095
 18      1016      374      149      126      129     e145     e150      440     1244     1260     1249     1072
 19      1003      353      137      126      139     e145     e149      442     1238     1258     1246     1048
 20       989      331      129      125      139     e145     e149      445     1232     1257     1243     1024

 21       975      308      124      125      141     e145     e149      452     1215     1256     1241     1000
 22       963      285      121      124      140     e145     e149      455     1189     1255     1238      978
 23       949      265      120      125      145     e145     e150      459     1164     1254     1234      954
 24       935      245      119      127     e145     e145     e160      457     1139     1257     1233      933
 25       922      227      117      127     e145     e147     e170      453     1114     1259     1229      911

 26       908      210      115      125     e145     e145     e177      460     1110     1258     1223      889
 27       896      193      115      129     e145     e145     e185      469     1112     1258     1218      870
 28       884      178      115      129     e145     e146     e190      478     1113     1259     1212      856
 29       871      163      116      128     e145     e145     e195      490     1118     1259     1206      842
 30       859      150      115      128      ---     e145     e201      505     1128     1261     1199      828
 31       839      ---      115      128      ---     e145      ---      530      ---     1259     1193      ---

MAX      1249      810      155      129      145      150      201      530     1284     1271     1258     1186
MIN       839      150      108      112      127      145      143      265      574     1143     1193      828
 a    9644.02  9630.45  9629.59  9629.93                             9638.51  9648.50  9650.35  9649.42  9643.84
 b       -411     -689      -35      +13      +17        0      +56     +329     +598     +131      -66     -365

CAL YR 1995   MAX 1265  MIN 106  b   +9
WTR YR 1996   MAX 1284  MIN 108  b -422

  e Estimated.
  a Elevation, in feet, at end of month.
  b Change in contents, in acre-feet.