USGS Water-Year Summary for Site 12432500

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	Available Parameters
	62614 Elevation, lake/res, NGVD29(Obs.)

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Water year 2023: 2022-10-01 to 2023-09-30

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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.

REMARKS - Reservoir is formed by concrete dam, completed in 1913 and raised in 1950. Capacity, 104,200 acre-ft between elevations 1,512 ft and 1,536 ft, normal limits of operation. Contents at elevation 1,512 ft by capacity table used prior to October 1915, 148,600 acre-ft. Records given herein represent usable contents. Water used for power. About 25,000 acres irrigated upstream from station, largely from wells in the Spokane Valley. Flow regulated by Coeur d'Alene Lake and power plants along Spokane River.

CAPACITY TABLE
(Based on data furnished by Avista Corporation) 
Gage height (feet)   Contents (acre-feet)  Gage height (feet)   Contents (acre-feet)  
1,512                     0                      1,513               3,570 
1,517                   18,640                   1,520              30,550 
1,522                   38,880                   1,526              56,330
1,528                   65,460                   1,531              79,740 
1,532                   84,540                   1,533              89,360  
1,534                   94,240                   1,535              99,190  
1,536                  104,200                   1,537              109,300

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.