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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
14186100 GREEN PETER LAKE NEAR FOSTER, OR
LOCATION - Lat 44°27'00.00", long 122°32'56.40" referenced to North American Datum of 1983, in NE 1/4 SE 1/4 sec.10, T.13 S., R.2 E., Linn County, OR, Hydrologic Unit 17090006, in Green Peter Dam on Middle Santiam River, 7.0 mi northeast of Foster, and at mile 5.4.
DRAINAGE AREA - 273 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1966 to September 2003, October 2013 to current year. Prior to October 1971, published as Green Peter Reservoir near Foster.
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 - Reservoir is formed by concrete, gravity-type dam with ogee spillway completed in 1966 by U.S. Army Corps of Engineers; controlled storage began Oct. 6, 1966. Total capacity, 428,100 acre-ft, active capacity 330,800 acre-ft between elevations 887.0 ft, proposed lower limit of operation, and 1,015.0 ft, top of spillway gates. 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, 426,700 acre-ft Apr. 29, 1990, elevation, 1, 014.61 ft; minimum contents, 116,400 acre-ft Oct. 30, 2015, elevation, 898.87 ft.
