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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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USGS Water-Year Summary 2024
14145100 HILLS CREEK LAKE NEAR OAKRIDGE, OREG.
LOCATION - Lat 43°42'34.47", long 122°25'16.00" referenced to North American Datum of 1983, Lane County, OR, Hydrologic Unit 17090001, Willamette National Forest, near right end of Hills Creek Dam on Middle Fork Willamette River, 600 ft downstream from Hills Creek, 3.5 mi southeast of Oakridge, and at mile 232.5.
DRAINAGE AREA - 389 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - August 1961 to September 2003, August 2013 to current year. Prior to October 1971, published as Hills Creek Reservoir near Oakridge.
GAGE - Water-stage recorder. Datum of gage is NGVD of 1929 (levels by U.S. Army Corps of Engineers).
COOPERATION - Capacity table dated January 1968, furnished by U.S. Army Corps of Engineers.
REMARKS - Reservoir is formed by earthfill dam with concrete spillway completed in 1961 by the U.S. Army Corps of Engineers; storage began August 1961. Total capacity is 355,600 acre-ft at elevation 1,543.0 ft, top of spillway gates, and active capacity is 248,900 acre-ft between elevations 1,414.0 ft, minimum power pool, and 1,543.0 ft. Lake's primary purposes are flood risk management, hydropower, water quality improvement, irrigation, fish and wildlife habitat, recreation, and improved navigation. Month-end contents and change in contents discontinued water year 2014.
EXTREMES FOR PERIOD OF RECORD - Maximum contents, 354,200 acre-ft June 25, 1971, elevation, 1,542.52 ft; minimum contents, 104,800 acre-ft Jan. 2, 1969, elevation, 1,412.52 ft.
