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USGS Water-Year Summary 2024
14148000 MIDDLE FORK WILLAMETTE RIVER BELOW NORTH FORK, NEAR OAKRIDGE, OR
LOCATION - Lat 43°48'05", long 122°33'35" referenced to North American Datum of 1927, in SW 1/4 sec.27, T.20 S., R.2 E., Lane County, OR, Hydrologic Unit 17090001, on left bank, 0.5 mi downstream from Whitehead Creek, 4.2 mi downstream from North Fork of Middle Fork Willamette River, 7.0 mi northwest of Oakridge and at mile 220.2.
DRAINAGE AREA - 924 mi².
REVISIONS HISTORY - WSP 694: 1925-28. WSP 814: Drainage area at Eula. WSP 1248: 1924, 1925(M), 1926-28, 1929(M), 1930, 1933, 1946(M). WSP 1398: 1927(M). WSP 1638: 1936(M).
SURFACE-WATER RECORDS
PERIOD OF RECORD - March 1911 to September 1912, July 1923 to current year. Monthly discharge only for some periods, published in WSP 1318. Published as "near Hazeldell" 1911-12 and as "at Eula" 1923-50.
GAGE - Water-stage recorder. Datum of gage is 934.76 ft above NGVD of 1929. Mar. 22, 1911 to Sept. 30, 1912, nonrecording gage at site 4.0 mi upstream, just downstream from North Fork at different datum. July 1, 1923 to Aug. 11, 1935, nonrecording gage and Aug. 12, 1935 to Sept. 30, 1950, water-stage recorder at site 4.0 mi downstream at different datum.
REMARKS - Flow regulated since 1961 by Hills Creek Lake (active capacity, 248,900 acre-ft); slight regulation at times by logponds upstream from station. No diversion upstream from station.
EXTREMES OUTSIDE PERIOD OF RECORD - Maximum stage since 1861 and prior to March 1911, 17.0 ft in February 1890 at site used 1923-50, from information by local resident, discharge, about 55,000 ft³/s.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 81,800 ft³/s Dec. 28, 1945, gage height, 18.8 ft, from floodmark, site and datum then in use, from rating curve extended above 39,000 ft³/s; minimum discharge, 322 ft³/s Aug. 30, 1961, result of closing outlet gates at Hills Creek Dam.
WATER-QUALITY RECORDS
PERIOD OF DAILY RECORD - WATER TEMPERATURE: September 1950 to October 1960, June 1961 to September 1987, November 2008 to current year.
INSTRUMENTATION - Temperature probe and data logger.
EXTREMES FOR PERIOD OF DAILY RECORD - WATER TEMPERATURE: Maximum, 23.5°C Aug. 3, 1961; minimum, 0.0°C Jan. 20-22, 1962, Feb. 2, 1979, Jan. 28-30, 1980.
