11525400 TRINITY LAKE NEAR LEWISTON, CA
LOCATION.-Lat 40°48'05", long 122°45'44", in NW 1/4 SW 1/4 sec.15, T.34 N., R.8 W., Trinity County,
Hydrologic Unit 18010211, Trinity National Forest, Whiskeytown-Shasta-Trinity National Recreation Area, on side
of intake structure of Trinity Dam on Trinity River, and 9 mi north of Lewiston.
DRAINAGE AREA.-692 mi2.
PERIOD OF RECORD.-November 1960 to current year. From October 1963 to September 1997 published as Clair Engle
Lake near Lewiston.
GAGE.-Water-stage recorder. Datum of gage is sea level (levels by U.S. Bureau of Reclamation). Prior to Jan. 4,
1962, nonrecording gage at same site and datum. Contents based on capacity table provided by U.S. Bureau of
Reclamation, dated April 1962.
REMARKS.-The lake is formed by an earthfill dam completed in November 1960. Storage began Nov. 23, 1960. Usable
capacity, 2,437,700 acre-ft, between elevations 1,995.5 ft, elevation of invert of river outlets, and 2,370.0 ft,
crest of glory hole spillway. Dead storage, 10,000 acre-ft. Operating pool is from elevation 2,145.0 ft,
capacity, 312,621 acre-ft, to 2,370.0 ft, capacity, 2,447,700 acre-ft. Figures given represent total contents at
2400 hours. Lake is used for power generation, flood control, and recreation. See schematic diagram of Klamath
River and Trinity River Basins.
COOPERATION.-Records were provided by U.S. Bureau of Reclamation, not rounded to U.S. Geological Survey
standards.
EXTREMES (at 2400 HOURS) FOR PERIOD OF RECORD.-Maximum contents, 2,588,000 acre-ft, Jan. 19, 1974, elevation,
2,378.32 ft; minimum since first filling, 222,400 acre-ft, Nov. 9, 1977, elevation, 2,120.22 ft.
EXTREMES (at 2400 HOURS) FOR CURRENT YEAR.-Maximum contents, 2,396,535 acre-ft, June 17, elevation, 2,366.88 ft;
minimum, 1,905,930 acre-ft, Jan. 14, elevation, 2,334.35 ft.
Capacity table (elevation, in feet, and contents, in acre-feet)
(Based on table provided by U.S. Bureau of Reclamation, dated April 1962)
2,100 162,231 2,250 955,140
2,140 292,859 2,310 1,583,586
2,190 529,611 2,380 2,616,989
RESERVOIR STORAGE (ACRE-FEET), WATER YEAR OCTOBER 1998 TO SEPTEMBER 1999
DAILY OBSERVATION AT 2400 HOURS
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
1 2073888 2009316 1975007 1948080 1937694 2013388 2099601 2213185 2384710 2368269 2216100 2090216
2 2070637 2008442 1981060 1941242 1938259 2018342 2102431 2217328 2386818 2363296 2211500 2085313
3 2067978 2007569 1989437 1934430 1939254 2024184 2104072 2219782 2386656 2357531 2206906 2081306
4 2064874 2006841 1993493 1930029 1937126 2027396 2104671 2223008 2387142 2353368 2201859 2076557
5 2061768 2005680 1996389 1926919 1934711 2029438 2106164 2225308 2388436 2349530 2196204 2072409
6 2058815 2004807 1997839 1923813 1935705 2030316 2106763 2230082 2389408 2344754 2190101 2068126
7 2055429 2006262 1998854 1921552 1938685 2030610 2107212 2236086 2389408 2340457 2184160 2063987
8 2052928 2005389 1997839 1919718 1942518 2031784 2108410 2240707 2389084 2335686 2179132 2059848
9 2049101 2004807 1997259 1917457 1946366 2031784 2108560 2243178 2388922 2332039 2174881 2056608
10 2046158 2005680 1997259 1915199 1948222 2031490 2110054 2245188 2388598 2327608 2170477 2052486
11 2043363 2005098 1997259 1912952 1950647 2030316 2110503 2248123 2389084 2323812 2165926 2047922
12 2040432 2004516 1997694 1910422 1952075 2029438 2112000 2251522 2389895 2320486 2160320 2042923
13 2037647 2003933 1998419 1908316 1954500 2028127 2113943 2254767 2391192 2315601 2156538 2036766
14 2035449 2002914 1998419 1905930 1956210 2027688 2117682 2257090 2393458 2310253 2153512 2031637
15 2033101 2002336 1997549 1906910 1957782 2027688 2121131 2258949 2395566 2304436 2148822 2027542
16 2030904 2000300 1994798 1906910 1961654 2028562 2126539 2260656 2396215 2298013 2145204 2023307
17 2029146 1994508 1992478 1909582 1964666 2029292 2135256 2263291 2396535 2292856 2140983 2019072
18 2027542 1987846 1990887 1915765 1969974 2030757 2145959 2268099 2396053 2287226 2137818 2014258
19 2025496 1980920 1988422 1919294 1974718 2033835 2156689 2273531 2395404 2281622 2134351 2009607
20 2023599 1975007 1986396 1922824 1976594 2037207 2166074 2278044 2394107 2276023 2130895 2005680
21 2022430 1977456 1983658 1925223 1977745 2040872 2173365 2286914 2393783 2270113 2127892 2002044
22 2021407 1974718 1981205 1930172 1979044 2044537 2176552 2294418 2393458 2264688 2124886 1997549
23 2019365 1981926 1978611 1935421 1981349 2047922 2178372 2304436 2392003 2258949 2121883 1993203
24 2019365 1981493 1975873 1938401 1985242 2055282 2181873 2315601 2389408 2254302 2118580 1988136
25 2017465 1977601 1973423 1939254 1991612 2064135 2186750 2328396 2386656 2249825 2115889 1983802
26 2015422 1976161 1970688 1939964 1993783 2071229 2194368 2339027 2382930 2245034 2112599 1979044
27 2014112 1972269 1967820 1939822 1996099 2078042 2199414 2350008 2379868 2240707 2109458 1974430
28 2012951 1965958 1965096 1939538 2005826 2082643 2202930 2359935 2377288 2236086 2106164 1969686
29 2011787 1963661 1962372 1939254 --- 2087241 2206140 2368914 2374552 2231774 2102132 1965670
30 2011204 1968538 1959361 1938685 --- 2092151 2208280 2374391 2371654 2226850 2098113 1961654
31 2010185 --- 1955214 1938685 --- 2096025 --- 2379868 --- 2220857 2094090 ---
a 2341.64 2338.76 2337.83 2336.67 2341.34 2347.47 2354.90 2365.85 2365.34 2355.72 2347.34 2338.28
b -67115 -41647 -13324 -16529 +67141 +90199 +112255 +171588 -8214 -150797 -126767 -132436
MAX 2073888 2009316 1998854 1948080 2005826 2096025 2208280 2379868 2396535 2368269 2216100 2090216
MIN 2010185 1963661 1955214 1905930 1934711 2013388 2099601 2213185 2371654 2220857 2094090 1961654
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