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USGS Water-Year Summary 2024
14309000 COW CREEK NEAR AZALEA, OR
LOCATION - Lat 42°49'30", long 123°10'40" referenced to North American Datum of 1927, Douglas County, OR, Hydrologic Unit 17100302, on right bank, 0.8 mi upstream from Whitehorse Creek, 4.5 mi northeast of Azalea and at mile 58.2.
DRAINAGE AREA - 78 mi².
REVISIONS HISTORY - WSP 984: 1933-36. WSP 1154: 1946(M), 1948(M). WSP 1448: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - April 1926 to September 1928 (no winter records), April 1929 to December 1931, April 1932 to current year.
GAGE - Water-stage recorder. Datum of gage is 1,694.32 ft above NGVD of 1929 (Douglas County Road Department bench mark). Prior to July 19, 1949, nonrecording gage at same site and datum.
REMARKS - Flow regulated since Oct. 7, 1985 by Galesville Reservoir (active capacity, 42,220 acre-ft). Diversions for irrigation upstream from station.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 10,600 ft³/s Jan. 15, 1974, gage height, 16.40 ft, from high-water mark in well; minimum discharge, 1.1 ft³/s Aug. 12, 1981, but may have been less during period of missing record Sept. 4-30, 1970.
WATER-QUALITY RECORDS
PERIOD OF DAILY RECORD -
DISSOLVED OXYGEN: November 1985 to current year.
TURBIDITY: October 1999 to September 2005.
INSTRUMENTATION - Water-quality monitor and data logger.
EXTREMES FOR PERIOD OF DAILY RECORD -
DISSOLVED OXYGEN: Maximum recorded, 15.1 mg/L Feb. 7, 1989, Nov. 17, 20, 1996, result of operation of bypass valve at dam; minimum, 0.9 mg/L July 30, 1988.
TURBIDITY: Maximum recorded, 89 FNU May 1, 2002, but may have been higher during period of missing record; minimum, <1 FNU on many days each year.
