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USGS Water-Year Summary 2024
11507001 UPPER KLAMATH LAKE NEAR KLAMATH FALLS, OR
LOCATION - Lat 42°15'00", long 121°48'55" referenced to North American Datum of 1927, in NW 1/4 SW 1/4 sec.19, T.38 S., R.9 E., Klamath County, OR, Hydrologic Unit 18010203, at southeast end of lake, 1.4 mi upstream from outlet and 2.5 mi northwest of Main Street bridge at Klamath Falls.
DRAINAGE AREA - 3,810 mi². approximately, including 26.2 mi² in closed basin of Crater Lake.
REVISIONS HISTORY -
WDR-US-2010: 2008. WYS 2015: 2014.
Revision: The offset to convert data to NAVD of 1988 was revised on Feb. 28, 2024. The previously reported conversion to NAVD of 1988 read as: add 1.83 ft to elevation reading to convert to NAVD of 1988.
SURFACE-WATER RECORDS
PERIOD OF RECORD - May 1904 to September 1922 (gage heights only), October 1922 to current year. Month-end contents only October 1923 to September 1927, published in WSP 1315-B.
GAGE - Water-stage recorder. Datum of gage is U.S. Bureau of Reclamation datum. Subtract 1.78 ft from elevation reading to convert to NGVD of 1929; add 2.01 ft to elevation reading to convert to NAVD of 1988. See WSP 1735 for history of changes prior to Nov. 10, 1923. Since Oct. 1, 1974, supplementary water-stage recorders at sites 7 mi north and 21 mi northwest at same datum (water-surface transfer by PacifiCorp), and since Dec. 24, 2013, an additional supplementary water-stage recorder at site 24 mi north northwest at same datum (water-surface transfer).
COOPERATION - Capacity table furnished by U.S. 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-ft between elevations 4,136.0 ft and 4,143.3 ft. Dead storage, 211,300 acre-ft, below elevation 4,136.0 ft. Stored water may be diverted through the "A" Canal for irrigation of land under Klamath project of U.S. Bureau of Reclamation or released to Link River through dam or powerplants at Klamath Falls. Prior to Oct. 1, 1973, contents given represented those above elevation 4,135.0 ft. Oct. 1, 1973 to Sept. 30, 2013, contents given represented those above elevation 4,136.0 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 following month to compensate for wind effect. Month-end contents and change in contents discontinued water year 2014. Since Oct. 1, 1974, daily elevations are weighted mean of elevations at base 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.
