10336608  ECHO LAKE NEAR PHILLIPS, CA

LOCATION.--Lat 38°50'05", long 120°02'36", in NE 1/4 NE 1/4 sec.1, T.11 N., R.17 E., El Dorado County, Hydrologic
   Unit 16050101, Eldorado National Forest, at right end of dam on Lower Echo Lake near valve outlet to Echo Lake
   Conduit and 2.0 mi northeast of Phillips.

DRAINAGE AREA.--4.84 mi2.

PERIOD OF RECORD.--October 1991 to current year.  Unpublished records for 1981-91 water years are available in
   files of the U.S. Geological Survey.

GAGE.--Water-stage recorder.  Prior to Dec. 3, 1991, nonrecording gage read periodically.  Elevation of gage is
   7,414 ft above sea level, from topographic map.

REMARKS.--Reservoir is formed by concrete dam completed in 1922 and rebuilt in 1992; storage began in 1922.
   Usable capacity, 1,890 acre-ft between gage heights 0.0 ft, spillway crest, and 6.0 ft, top of flashboards.
   Water is released via Echo Lake Conduit (station 11434500) to the South Fork American River for power and
   domestic use.  Records from Dec. 3, 1991, including extremes, represent usable contents at 2400 hours.  See
   schematic diagram of Truckee River basin.

COOPERATION.--Records were collected by Pacific Gas & Electric 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, 1,968 acre-ft, June 10, 1994, gage height, 6.24 ft; minimum,
   0 acre-ft, Nov. 18-20, 1993, many days in 1995, gage height, 0.0 ft.
EXTREMES FOR CURRENT YEAR.--Maximum contents, 1,916 acre-ft, July 4, gage height, 6.08 ft; minimum, 0 acre-ft,
   many days, gage height, 0.0 ft.

                        Capacity table (gage height, in feet, and contents, in acre-feet)
                             (Based on survey by Pacific Gas & Electric Co. in 1934)

                                  0             0              4            1,255
                                  1           310              5            1,570
                                  2           625              6            1,890
                                  3           940              6.7          2,118

                    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       759        0        0      170      120       87      114      301     1508     1838     1867     1751
  2       673        0        0      170      117       81      108      328     1687     1874     1841     1739
  3       590        0        0      170      120      105      102      322     1822     1906     1844     1724
  4       542        0       36      158      253      148       96      298     1825     1916     1848     1667
  5       464        0       54      127      440      120       96      277     1815     1903     1841     1606

  6       392        0       69      127      412       84       96      286     1848     1900     1835     1560
  7       319        0       72      114      325       69      108      289     1877     1900     1828     1515
  8       256        0       72      114      265       57      148      292     1864     1896     1825     1478
  9       195        0       51      102      244       45      185      301     1828     1893     1828     1439
 10       134        0       51      102      216       90      199      307     1815     1887     1828     1389

 11        87        0      161       96      192      127      192      325     1828     1890     1828     1353
 12        66        0     e408       90      188      134      185      372     1883     1890     1835     1316
 13        57        0     e359       84      185      105      173      464     1900     1893     1848     1288
 14        45        0     e310       93      170      102      161      530     1887     1896     1838     1258
 15        39        0      259      108      144       96      173      873     1864     1890     1838     1221

 16        33        0      216      202      151       87      226     1169     1854     1890     1835     1184
 17        33        0      176      182      179       84      209     1093     1857     1883     1822     1148
 18        24        0      161      213      188       84      199     1032     1861     1864     1822     1115
 19        18        0      134      209      209      102      173      928     1867     1864     1812     1079
 20         6        0      114      182      213      114      144      883     1870     1861     1809     1042

 21         6        0      102      195      235      123      120      952     1854     1857     1805     1006
 22         9        0       96      170      199      158      108      982     1841     1851     1805      979
 23         9        0       90      185      141      151      114      988     1841     1848     1796      943
 24         6        0       84      265      158      127      155      943     1835     1848     1796      916
 25         3        0       75      241      137      114      199      946     1828     1851     1799      895

 26         3        0       69      216      114      102      238      916     1828     1857     1802      869
 27         3        0       81      241      105      108      262      949     1818     1861     1792      862
 28         3        0       69      195       96      123      268     1000     1805     1864     1776      848
 29         3        0       90      179       90      111      262     1148     1802     1864     1776      830
 30         6        0      111      167      ---       99      271     1279     1809     1870     1773      794
 31         0      ---      158      141      ---       90      ---     1386      ---     1870     1766      ---

MAX       759        0      408      265      440      158      271     1386     1900     1916     1867     1751
MIN         0        0        0       84       90       45       96      277     1508     1838     1766      794
 a          0        0      .51      .46      .30      .30      .87     4.41     5.75     5.94     5.62     2.54
 b       -859        0     +158      -17      -51        0     +181    +1115     +423      +61     -104     -972
CAL YR 1995   MAX 1900  MIN 0  b +77
WTR YR 1996   MAX 1916  MIN 0  b -65
  e Estimated.
  a Gage height, in feet, at end of month.
  b Change in contents, in acre-feet.