USGS Water-Year Summary 2023
11406870 Thermalito Afterbay near Oroville, CA
LOCATION - Lat 39°27'30", long 121°38'17" referenced to North American Datum of 1927, in NE 1/4 SE 1/4 sec.33, T.19 N., R.3 E., Butte County, CA, Hydrologic Unit 18020106, at dam, 195 ft northeast of centerline of outlet structure, and 5.7 mi southwest of Oroville.
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1967 to current year.
WATER TEMPERATURE: Water year 1968.
GAGE - Water-stage recorder. Datum of gage is 100.47 ft above NGVD of 1929 (levels by California Department of Water Resources). Auxiliary water-stage recorder 90 ft southwest of centerline of Western Canal outlet and 7.2 mi west of Oroville.
COOPERATION - Records were collected by California Department of Water Resources, under general supervision of the U.S. Geological Survey, in connection with Federal Energy Regulatory Commission project no. 2100. Contents not rounded to U.S. Geological Survey standards.
EXTREMES FOR PERIOD OF RECORD - Prior to Oct. 1, 2008, maximum contents at 2400 hours, 57,300 acre-ft, May 24, 1969, gage height, 136.56 ft; minimum since initial operation began, 5,590 acre-ft, Mar. 1, 1968, gage height, 119.09 ft. Since Oct. 1, 2008, maximum contents, 55,160 acre-ft, Mar. 27, 2010, gage height 136.06.