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USGS Water-Year Summary 2024
14153000 COTTAGE GROVE LAKE NEAR COTTAGE GROVE, OR
LOCATION - Lat 43°43'00", long 123°02'55" referenced to North American Datum of 1927, in NE 1/4 sec.28, T.21 S., R.3 W., Lane County, OR, Hydrologic Unit 17090002, in east abutment of dam on Coast Fork Willamette River, 5.8 mi south of Cottage Grove and at mile 29.7.
DRAINAGE AREA - 104 mi².
REVISIONS HISTORY - WSP 1218: 1950.
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1942 to September 2003, October 2013 to current year. Prior to October 1971, published as Cottage Grove Reservoir near Cottage Grove.
GAGE - Water-stage recorder. Datum of gage is NGVD of 1929 (levels by U.S. Army Corps of Engineers).
COOPERATION - Capacity table dated January 1968, furnished by U.S. Army Corps of Engineers.
REMARKS - Lake is formed by earthfill dam with concrete spillway completed by U.S. Army Corps of Engineers in 1942; storage began Oct. 31, 1942. Capacity, 32,930 acre-ft between elevations 719.0 ft (outlet conduit) and 791.0 ft (crest of spillway). Dead storage negligible. Lake's primary purposes are flood risk management, water quality improvement, irrigation, fish and wildlife habitat, and improved navigation. Month-end contents and change in contents discontinued water year 2014.
EXTREMES FOR PERIOD OF RECORD - Maximum contents, 36,750 acre-ft Dec. 24, 1964, elevation, 794.23 ft; minimum contents since first filling, no contents Sept. 26 to Oct. 19, 1966, and Nov. 14, 15, Nov. 20 to Dec. 8, 1969.
