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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
12147900 SOUTH FORK TOLT RESERVOIR NEAR CARNATION, WA
LOCATION - Lat 47°41'38", long 121°41'16" referenced to North American Datum of 1927, in NW 1/4 SW 1/4 sec.32, T.26 N., R.9 E., King County, WA, Hydrologic Unit 17110010, on top and near the center of the dam, 11.4 mi northeast of Carnation, and at mile 8.4.
DRAINAGE AREA - 18.8 mi².
REVISIONS HISTORY - WA-98-1: 1997.
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1991 to current year.
GAGE - Water-stage recorder. Datum of gage is NGVD of 1929 (Seattle Public Utilites benchmark).
COOPERATION - Capacity table furnished by Seattle Public Utilites.
REMARKS - Reservoir is formed by earthfill dam, with a concrete bell-mouth spillway, completed in 1962. Water used for municipal water supply by Seattle Water Department. Usable capacity, 15,600 acre-ft between elevations 1,749 ft (minimum pool) and 1,765 ft (maximum normal pool). Top of dam is at 1,775 ft with top of spillway at 1,757 ft. Flood control between elevations 1,749 and 1,757 ft. Figures given represent total contents at 2400 hours. U.S. Geological Survey satellite telemeter at station.
EXTREMES FOR PERIOD OF RECORD - Maximum contents, 59,511 acre-ft, May 20, 21, 2008, elevation, 1,766.54 ft; minimum contents observed, 16,280 acre-ft, Oct. 12, 2003, elevation, 1,711.77 ft.
