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USGS Water-Year Summary 2024
14168000 FERN RIDGE LAKE NEAR ELMIRA
LOCATION - Lat 44°07'15", long 123°18'00" referenced to North American Datum of 1927, in sec.04, T.17 S., R.5 W., Lane County, OR, Hydrologic Unit 17090003, in control house at spillway section of dam across Long Tom River and Coyote Creek, 4.5 mi northeast of Elmira and at mile 25.7.
DRAINAGE AREA - 252 mi². not including Amazon Creek basin.
SURFACE-WATER RECORDS
PERIOD OF RECORD - November 1941 to September 2003, August 2013 to current year. Prior to October 1971, published as Fern Ridge Reservoir near Elmira.
GAGE - Water-stage recorder. Datum of gage is NGVD of 1929 (levels by U.S. Army Corps of Engineers).
COOPERATION - Capacity table furnished by U.S. Army Corps of Engineers.
REMARKS - Lake is formed by earthfill dam with concrete outlet and spillway, completed in 1941 by U.S. Army Corps of Engineers; storage began Nov. 13, 1941. Total capacity (new capacity table put into use Oct. 1, 1992 based on December 1992 resurvey), 107,400 acre-ft at elevation 375.1 ft, maximum pool elevation. Active capacity, 93,350 acre-ft between elevations 340.0 ft, sill of outlet gate, and 373.5 ft, normal maximum operating pool level. Lake's primary purposes are flood risk management, water quality improvement, irrigation, fish and wildlife habitat, recreation, and improved navigation. Since November 1951, most of flow of Amazon Creek has been diverted in SE 1/4 sec.29, T.17 S., R.4 W., and discharged into Fern Ridge Lake; drainage area at point of diversion, 21.3 mi². Month-end contents and change in contents discontinued water year 2003. Continuous water-quality records for period March 2005 to September 2006 have been collected at this location.
EXTREMES FOR PERIOD OF RECORD - Maximum contents, 124,500 acre-ft Dec. 27, 1955, elevation, 375.83 ft; minimum contents since first filling in 1942, 163 acre-ft Nov. 11, 1950, elevation, 344.00 ft.
