USGS Water-Year Summary for Site 11507000

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	Available Parameters
	72275 Lake/res elev, USBRKB(Mean,Obs.)

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

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USGS Water-Year Summary 2023

11507000 UPPER KLAMATH LAKE NEAR KLAMATH FALLS, OR

LOCATION - Lat 42°15'00", long 121°48'55" referenced to North American Datum of 1927, Klamath County, OR, Hydrologic Unit 18010203, at southeast end of lake, 1.4 mi upstream from outlet and 2.5 mi northeast of Main Street Bridge at Klamath Falls.

DRAINAGE AREA - 3,810 mi². approximately including 26.2 mi² in closed basin of Crater Lake.

SURFACE-WATER RECORDS

PERIOD OF RECORD - May 1904 to September 1922 (gage heights only), October 1922 to current year. Monthend contents only October 1923 to September 1927, published in WSP 1315-B.

GAGE - Water-stage recorder. Datum of gage is 4,098.22 ft above sea level, or 4,100.00 ft above Bureau of Reclamation datum. Gage readings have been reduced to elevation above Bureau of Reclamation datum. See WSP 1735 for history of changes prior to Nov. 10, 1023. Since Oct 1, 1974, supplementary water-stage recorders at sites 7 mi north and 21 mi northwest at same datum (water-surface transfer by Pacific Power and Light Co.).

COOPERATION - Capacity table furnished by Bureau of Reclamation, Klamath Project.

REMARKS - Reservoir is formed by concrete dam at outlet of natural lake, completed in 1921, replacing a temporary dam built in 1919; controlled storage began Apr. 15, 1919. Capacity 523,700 acre-feet between elevations 4,136.0 ft and 4,143.3 ft. Dead storage below elevation 4,136.0 ft is 211,300 acre-ft. Stored water may be diverted through "A" Canal for irrigation on land under Klamath project of Bureau of Reclamation, or released to Link River through dam or powerplants at Klamath Falls. Contents given herein represent those above elevation 4.136.0 ft. Prior to Oct. 1, 1973, contents given represented those above elevation 4,135.0 ft. Prior to Sept. 30, 1974, contents at end of month obtained by averaging elevations for last 3 days of month and first 3 days of the following month to compensate for wind effect. Since Oct. 1, 1974, daily elevations are weighted mean of elevations at base and supplementary gages, contents at end of month are obtained from weighted midnight elevations of base elevations and supplementary gages.

EXTREMES FOR PERIOD OF RECORD - Maximum elevation, 4,144.98 ft about Apr. 20, 1904, from high-water marks; minimum recorded, 4,135.55 ft Oct. 30, 1944.