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USGS Water-Year Summary 2024
14319500 NORTH UMPQUA RIVER AT WINCHESTER, OR
LOCATION - Lat 43°16'20", long 123°24'40" referenced to North American Datum of 1927, in NW 1/4 NE 1/4 sec.33, T.26 S., R.6 W., Douglas County, OR, Hydrologic Unit 17100301, on left bank, 300 ft downstream from county bridge, 3.0 mi west of Winchester and at mile 1.8.
DRAINAGE AREA - 1,344 mi².
REVISIONS HISTORY -
WSP 1448: 1909-12, drainage area. WDR OR-65-1: 1954(M). WDR OR-72-1: 1965(M). WYS 2014: 2014.
Revision: Annual maximum gage-height for water years 1986 and 1988 to 1991 were revised on Oct. 31, 2023, based on further review of the annual peak gage-height record.
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1908 to December 1913, October 1923 to September 1929, August 1954 to current year. Prior to December 1908, monthly discharge only, published in WSP 1318.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 372.97 ft above NGVD of 1929 (Douglas County Road Department bench mark). Oct. 1, 1908 to Dec. 31, 1913 and Oct. 1, 1923 to Sept. 30, 1929, nonrecording gage at site 4.8 mi upstream at different datums. Aug. 27, 1954 to Aug. 12, 1965, water-stage recorder on right bank at same datum.
REMARKS - Occasional regulation caused by upstream powerplants; slight regulation by Lemolo Lake (active capacity, 12,520 acre-ft). Several small diversions for irrigation upstream from station. Continuous water-quality records for water years 1967-69, 1971-91 have been collected at this location.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of Oct. 29, 1950, reached a stage of 23.2 ft, from floodmark, at site 4.8 mi upstream at different datum, discharge, 88,000 ft³/s. Flood of Nov. 23, 1953, reached a stage of 28.4 ft, from floodmarks, present site and datum, discharge, 93,300 ft³/s.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 150,000 ft³/s Dec. 22, 1964, gage height, 34.2 ft, from floodmark; minimum discharge, 235 ft³/s Aug. 27, 1987, result of regulation at Winchester Dam 5.2 mi upstream.
WATER-QUALITY RECORDS
PERIOD OF DAILY RECORD - WATER TEMPERATURE: January 1971 to September 1991, September 2016 to current year.
INSTRUMENTATION - Temperature probe and data logger.
EXTREMES FOR PERIOD OF DAILY RECORD - WATER TEMPERATURE: Maximum, 29.1°C June 28, 2021; minimum, 0°C on several days in water years 1972, 1974, 1977, 1980, 1984, 1989, 1991.
