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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
- For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
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USGS Water-Year Summary 2024
14152500 COAST FORK WILLAMETTE RIVER AT LONDON, OR
LOCATION - Lat 43°38'30", long 123°05'05" referenced to North American Datum of 1927, Lane County, OR, Hydrologic Unit 17090002, on left bank, 0.6 mi north of London, 11.0 mi south of Cottage Grove and at mile 35.9.
DRAINAGE AREA - 72.1 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - September 1935 to September 1987, October 2011 to September 2014, September 2017 to October 2019 (gage height only), October 2019 to current year.
GAGE - Water-stage recorder. Datum of gage is 852.58 ft above NGVD of 1929 (levels by U.S. Army Corps of Engineers). Sept. 18 to Oct. 17, 1935, nonrecording gage at same site and datum.
REMARKS - No regulation. Diversions for irrigation upstream from station. Continuous water temperature records for periods July 1960 to September 1965 and June 1967 to September 1987 have been collected at this location.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 12,500 ft³/s Dec. 22, 1964, gage height, 13.37 ft, from rating curve extended above 3,200 ft³/s, on basis of slope-area measurement of peak flow; minimum discharge, 4.05 ft³/s Sept. 9, 2020.
WATER-QUALITY RECORDS
PERIOD OF RECORD - WATER TEMPERATURE: September 2019 to current year.
INSTRUMENTATION - Temperature probe and data logger.
EXTREMES FOR PERIOD OF RECORD - WATER TEMPERATURE: Maximum, 27.9°C June 28, 2021; minimum, 0.5°C Nov. 20, 2022.
