USGS
1995 California Hydrologic Data Report
11450000 CLEAR LAKE AT LAKEPORT, CA
LOCATION.--Lat 39`02'21", long 122`54'44", in NE 1/4 NE 1/4 sec.25, T.14 N., R.10 W., Lake County, Hydrologic
Unit 18020116, in concrete block building at 410 Esplanade Street in Lakeport.
DRAINAGE AREA.--528 mi2.
PERIOD OF RECORD.--1874-1900 (incomplete), January 1913 to April 1982, October 1984 to current year.
GAGE.--Water-stage recorder. Datum of gage is 1,318.26 ft above sea level (California State Land Commission
Benchmark). Prior to July 8, 1947, nonrecording gage, and July 8, 1947, to Mar. 17, 1949, at municipal wharf
at foot of Third Street in Lakeport at datum 0.33 ft higher. Mar. 18, 1949, to Sept. 30, 1967, at private
pier at foot of Fourth Street at datum 0.33 ft higher. Gage relocated at same datum, Apr. 20, 1982, and
published as "at Clearlake" for 1982-84.
REMARKS.--This natural lake is regulated by gates on a dam at outlet, completed in 1915. Capacity between gage
heights 0.00 and 7.56 ft, limits stipulated by court decree of 1920, about 319,000 acre-ft. Water is
released down natural channel of Cache Creek (station 11451000), from which it is diverted for irrigation.
See schematic diagram of lower Sacramento River basin.
EXTREMES FOR PERIOD OF RECORD.--Maximum gage height, 11.34 ft, Feb. 21, 1986, minimum observed, -3.50 ft,
Sept. 24-27, 1920.
EXTREMES OUTSIDE PERIOD OF RECORD.--Flood of Mar. 4, 1983, reached a stage of 11.24 ft, present datum, from
floodmarks.
EXTREMES FOR CURRENT YEAR.--Maximum gage height, 10.73 ft, Mar. 24; minimum daily, 0.39 ft, Nov. 2, 3.
GAGE HEIGHT, FEET, WATER YEAR OCTOBER 1994 TO SEPTEMBER 1995
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
1 .79 .40 .68 1.18 8.84 7.21 9.72 7.63 7.48 6.88 5.61 4.41
2 .77 .39 .68 1.21 8.81 7.27 9.59 7.63 7.46 6.83 5.57 4.37
3 .76 .39 .78 1.24 8.74 7.32 9.44 7.59 7.42 6.77 5.53 4.32
4 .76 .40 .83 1.37 8.65 7.35 9.29 7.53 7.37 6.74 5.50 4.29
5 .75 .51 .83 1.45 8.56 7.36 9.13 7.45 7.30 6.71 5.45 4.27
6 .74 .53 .84 1.63 8.46 7.38 9.01 7.48 7.31 6.64 5.41 4.26
7 .73 .53 .84 2.01 8.35 7.39 8.91 7.49 7.30 6.60 5.36 4.23
8 .73 .52 .84 2.95 8.25 7.41 8.80 7.50 7.29 6.56 5.33 4.20
9 .72 .59 .84 4.60 8.13 8.23 8.73 7.51 7.29 6.51 5.28 4.17
10 .70 .62 .84 5.75 8.03 9.07 8.60 7.50 7.27 6.45 5.20 4.14
11 .68 .61 .85 6.36 7.92 9.71 8.49 7.47 7.26 6.40 5.18 4.11
12 .62 .60 .87 6.80 7.79 10.02 8.37 7.50 7.25 6.36 5.14 4.08
13 .63 .60 .90 7.19 7.68 10.20 8.27 7.58 7.23 6.33 5.12 4.05
14 .55 .60 .94 7.71 7.58 10.42 8.16 7.59 7.24 6.30 5.08 4.02
15 .56 .62 .97 8.01 7.48 10.61 8.04 7.63 7.22 6.27 5.04 3.98
16 .57 .59 .99 8.12 7.37 10.66 7.96 7.64 7.24 6.23 4.97 3.94
17 .55 .56 1.01 8.13 7.27 10.61 7.84 7.65 7.22 6.21 4.93 3.91
18 .54 .60 1.02 8.09 7.18 10.51 7.71 7.64 7.17 6.16 4.90 3.89
19 .53 .59 1.03 8.02 7.13 10.40 7.61 7.64 7.17 6.11 4.86 3.87
20 .52 .60 1.03 7.94 7.14 10.38 7.54 7.62 7.17 6.07 4.84 3.84
21 .52 .59 1.03 7.88 7.16 10.42 7.58 7.60 7.16 6.03 4.80 3.82
22 .52 .59 1.04 7.89 7.16 10.54 7.58 7.59 7.14 5.99 4.77 3.78
23 .51 .58 1.06 8.06 7.18 10.68 7.57 7.57 7.13 5.95 4.73 3.75
24 .50 .59 1.06 8.25 7.18 10.71 7.55 7.56 7.10 5.92 4.68 3.72
25 .49 .63 1.08 8.34 7.19 10.66 7.52 7.56 7.09 5.88 4.65 3.66
26 .49 .65 1.09 8.40 7.20 10.57 7.52 7.55 7.07 5.85 4.61 3.63
27 .47 .69 1.10 8.53 7.20 10.45 7.52 7.53 7.03 5.82 4.57 3.59
28 .47 .68 1.12 8.61 7.21 10.32 7.54 7.53 7.00 5.77 4.51 3.53
29 .46 .68 1.14 8.65 --- 10.19 7.57 7.52 6.96 5.73 4.49 3.52
30 .45 .68 1.15 8.75 --- 10.02 7.59 7.51 6.91 5.69 4.46 3.49
31 .44 --- 1.16 8.83 --- 9.87 --- 7.51 --- 5.65 4.44 ---
MEAN .60 .57 .96 6.19 7.74 9.48 8.22 7.56 7.21 6.24 5.00 3.96
MAX .79 .69 1.16 8.83 8.84 10.71 9.72 7.65 7.48 6.88 5.61 4.41
MIN .44 .39 .68 1.18 7.13 7.21 7.52 7.45 6.91 5.65 4.44 3.49
CAL YR 1994 MEAN 2.49 MAX 4.41 MIN .39
WTR YR 1995 MEAN 5.29 MAX 10.71 MIN .39
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