USGS Water-Year Summary 2023
14153500 COAST FORK WILLAMETTE RIVER BELOW COTTAGE GROVE DAM, OR
LOCATION - Lat 43°43'15", 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, on right bank, at bridge 0.3 mi downstream from Cottage Grove Dam, 5.5 mi south of Cottage Grove and at mile 29.4.
DRAINAGE AREA - 104 mi².
WSP 1448: 1949(M).
Revision: Annual maximum gage-height for Water Year 1944 was revised on Apr. 21, 2023 based on further review of the annual peak gage-height record.
PERIOD OF RECORD - January 1939 to current year. Prior to October 1944, published as "near Cottage Grove."
GAGE - Water-stage recorder. Datum of gage is 711.00 ft above NGVD of 1929 (U.S. Army Corps of Engineers bench mark). Jan. 1 to Oct. 12, 1939, nonrecording gage and Oct. 13, 1939 to Sept. 30, 1944, water-stage recorder at several sites and datums 0.8 mi downstream.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 5,910 ft³/s Dec. 24, 1964, gage height, 11.83 ft; no flow part or all of each day July 5-7, 1945 and part of Aug. 24, 1947.
PERIOD OF DAILY RECORD - WATER TEMPERATURE: August 2001 to current year.
INSTRUMENTATION - Temperature probe and data logger.
EXTREMES FOR PERIOD OF DAILY RECORD - WATER TEMPERATURE: Maximum, 25.2°C Aug. 16, 2021; minimum, 2.1°C Jan. 6, 2017.