USGS Water-Year Summary 2015
11450000 Clear Lake at Lakeport, CA
LOCATION - Lat 39°02'21", long 122°54'44" referenced to North American Datum of 1927, in NE 1/4 NE 1/4 sec.25, T.14 N., R.10 W., Lake County, CA, Hydrologic Unit 18020116, on private pier behind Mosquito Abatement District, 410 Esplanade Street, in Lakeport.
RELOCATED: Rapid Deployment Gage mounted to steel railing at the end of the Library Park Pier on October 7, 2021 due to drought and low lake level.
DRAINAGE AREA - 528 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - 1874-1900 (incomplete), January 1913 to April 1982, October 1984 to current year.
GAGE - Water-stage recorder. Datum of gage is 1,320.74 ft above NAVD of 1988 and 1,318.26 ft above NGVD of 1929. 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.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of Mar. 4, 1983, reached a stage of 11.24 ft, present datum, from floodmarks.
EXTREMES FOR PERIOD OF RECORD - Maximum gage height, 11.44 ft, Feb. 24, 1998, minimum observed, -3.50 ft, Sept. 24-27, 1920.