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Water-Year Summary for Site 12193000

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Available Parameters
62615 Elevation, lake/res, NAVD88(Obs.)  

Water year 2023: 2022-10-01 to 2023-09-30
 
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USGS Water-Year Summary 2023
12193000 LAKE SHANNON AT CONCRETE, WA
LOCATION - Lat 48°32'53", long 121°44'22" referenced to North American Datum of 1927, in SW 1/4 sec.02, T.35 N., R.8 E., Skagit County, WA, Hydrologic Unit 17110005, at Baker Dam on Baker River near left bank, 0.7 mi north of Concrete, and at mile 1.2.
DRAINAGE AREA - 297 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - Nov. 1925 to current year.
GAGE - Water-stage recorder; prior to Nov. 11, 1959, water-stage indicator in powerplant. Datum of gage is NAVD of 1988. Prior to Oct. 1, 2004 datum of gage was 3.75 ft higher at NGVD of 1929. Prior to March 1959 at datum 2.03 ft higher. Period August 31, 1961 to September 30, 1991 at datum 3.90 ft higher.
REMARKS - Reservoir is formed by concrete-arch and gravity dam, completed in June 1927; storage began in November 1925. Usable storage, 132,900 acre-ft, between elevations 358.75 ft, minimum operating pool, and 442.35 ft, normal full pool. Dead storage below elevation 358.75 ft, 20,795 acre-ft. Spillway crest is at elevation 428.65 ft. Water used by Puget Sound Energy for power generation. Capacity table to datum of NAVD of 1988 prepared and furnished by Puget Sound Energy on the basis of a resurvey of the lake bed. Prior to Nov. 11, 1959, gage-height record furnished by Puget Sound Energy from powerplant log. Figures given herein represent total contents. U.S. Geological Survey satellite telemeter at station.
EXTREMES FOR PERIOD OF RECORD - Maximum contents, 161,470 acre-ft, Sept. 17, 1968, elevation, 443.40 ft, present datum; minimum contents since October 1953, 28,260 acre-ft, Mar. 6, 1969, elevation, 367.60 ft, present datum not determined prior to October 1953 because of incomplete records.