USGS Water-Year Summary 2023
12432500 LONG LAKE AT LONG LAKE, WA
LOCATION - Lat 47°50'12", long 117°50'20" referenced to North American Datum of 1927, in NW 1/4 SW 1/4 sec.13, T.27 N., R.39 E., Lincoln County, WA, Hydrologic Unit 17010307, at left end of spillway at Long Lake Dam on Spokane River, 12.0 mi north of Reardan, and at mile 33.9.
DRAINAGE AREA - 6,020 mi². of which about 122 mi² in the vicinity of Hayden Lake is noncontributing to this station.
REVISIONS HISTORY - WSP 1736: Month-end contents for 1916-33 corrected. WSP 1933: Drainage area. WDR WA-01-1: Calendar year change in contents for 1998-99 and 2008 corrected. WDR US-2010: 2009 (Corrected calendar year change in content in acre-feet).
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1913 to current year. Prior to October 1950 month-end contents only, published in WSP 1316. October 1950 to September 1977 month-end stage and contents only.
GAGE - Water-stage recorder with remote indicator in powerhouse. Datum of gage is NGVD of 1929 (levels by Avista Corporation).
COOPERATION - Lake elevations and capacity table furnished by Avista Corporation. Records not reviewed.
EXTREMES FOR PERIOD OF RECORD - Maximum contents, 107,600 acre-ft, Jan. 16, 1974, elevation, 1,536.67 ft; minimum contents, since filling reservoir in 1920, 214 acre-ft, Feb. 16, 1985, elevation, 1,512.06 ft.