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 Unpublished records for 1981-91 water years are available in files of the U.S. Geological Survey.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. Apr. 20 to
May 19 data missing due to equipment malfunction.
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, July 8, 9, 1997, gage height, 6.26 ft; minimum, 0 acre-ft, several days in most years, gage
height, 0.0 ft.
EXTREMES FOR CURRENT YEAR.-Maximum contents recorded, 1,903 acre-ft, Aug. 4, 13, and 14, gage height, 6.04 ft; minimum contents recorded, 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 1997 TO SEPTEMBER 1998
DAILY OBSERVATION AT 2400 HOURS
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
1 593 63 33 69 0 0 114 --- 223 1528 1880 1848
2 614 63 36 69 0 0 99 --- 289 1638 1887 1844
3 572 60 36 72 0 0 99 --- 316 1684 1890 1848
4 530 60 39 72 0 e3 93 --- 316 1709 1903 1844
5 488 51 39 72 0 e12 87 --- 316 1730 1900 1854
6 452 42 39 75 0 e48 93 --- 385 1721 1887 1864
7 426 39 42 75 0 e57 90 --- 470 1724 1900 1870
8 405 39 42 69 0 e57 81 --- 461 1727 1890 1867
9 384 36 42 69 0 57 72 --- 415 1745 1890 1900
10 363 30 45 108 0 57 75 --- 415 1727 1893 1877
11 342 33 45 51 0 54 78 --- 419 1727 1890 1844
12 321 36 45 21 0 54 78 --- 402 1727 1890 1805
13 300 36 48 0 0 57 90 --- 443 1739 1903 1770
14 279 36 48 24 0 57 87 --- 455 1760 1903 1742
15 258 21 51 63 0 57 81 --- 458 1760 1900 1700
16 237 24 51 72 0 57 75 --- 461 1757 1874 1654
17 216 24 51 84 0 66 72 --- 436 1783 1887 1654
18 195 27 54 108 0 69 69 --- 422 1822 1887 1580
19 174 30 54 84 0 81 69 --- 446 1835 1890 1550
20 153 30 54 48 0 96 78 123 449 1838 1883 1515
21 130 30 57 12 0 114 111 144 446 1835 1874 1487
22 120 27 57 3 0 185 192 141 446 1831 1867 1451
23 105 27 60 0 0 304 223 161 415 1828 1854 1421
24 99 27 60 0 0 e346 223 182 488 1825 1838 1399
25 93 27 60 0 0 e310 188 247 735 1828 1848 1341
26 87 30 63 0 0 e271 161 232 859 1844 1864 1335
27 81 30 63 0 0 e235 161 199 1016 1867 1867 1309
28 75 30 63 0 0 195 --- 185 1184 1887 1870 1267
29 69 33 66 0 --- 158 --- 173 1295 1883 1867 1231
30 66 33 66 0 --- 127 --- 167 1408 1883 1867 1193
31 --- --- 69 0 --- 120 --- 164 --- 1880 1857 ---
MAX --- 63 69 108 0 346 --- --- 1408 1887 1903 1900
MIN --- 21 33 0 0 0 --- --- 223 1528 1838 1193
a .21 .11 .23 0 0 .40 .53 4.48 5.97 5.90 3.81
b -616 -30 +36 -69 0 +120 +1244 +472 -23 -664
c 436 7.7 0 0 0 0 0 0 0 0 0 780
e Estimated.
a Gage height, in feet, at end of month.
b Change in contents, in acre-feet.
c Release, in acre-feet, through Echo Lake Conduit, provided by Paficic Gas & Electric Co.
USGS Water Resources of California
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Last modified: Wed Aug 4 09:40:27 PDT 1999