USGS Water-Year Summary 2020
14144800 MIDDLE FORK WILLAMETTE RIVER NEAR OAKRIDGE, OR
LOCATION - Lat 43°36'07", long 122°27'23" referenced to North American Datum of 1927, Lane County, OR, Hydrologic Unit 17090001, in SE 1/4 sec. 4, T.23 S., R.3 E., Willamette National Forest, on left bank, 0.15 mi downstream from Windfall Creek, 8 mi upstream from Hills Creek Dam, 9.8 mi south of Oakridge, and at mile 240.3.
DRAINAGE AREA - 264 mi².
PERIOD OF RECORD - October 1958 to September 1997, July 2010 to September 2013 (gage heights and discharge measurements only), October 2013 to current year (gage heights only).
GAGE - Water-stage recorder and crest-stage gage. Elevation of gage is 1,560 ft above NGVD of 1929, from topographic map. Prior to June 21, 1967, at site 0.85 mi upstream at different datums. June 21, 1967 to September 30, 1997, water-stage recorder at site 0.35 mi upstream at different datums.
EXTREMES FOR PERIOD OF RECORD - Maximum gage height, 16.96 ft Dec. 22, 1964, from floodmark, site and datum then in use.
PERIOD OF DAILY RECORD - WATER TEMPERATURE: October 1958 to January 1959, September 1959 to September 1987, August 2010 to current year.
INSTRUMENTATION - Temperature probe and data logger.
EXTREMES FOR PERIOD OF DAILY RECORD - WATER TEMPERATURE: Maximum, 24.4°C Aug. 2, 2017; minimum, 0.0°C on several days during winter period most years.