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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
- For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
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USGS Water-Year Summary 2024
11505900 UPPER KLAMATH LAKE AT RATTLESNAKE POINT, OR
LOCATION - Lat 42°20'55", long 121°49'35" referenced to North American Datum of 1927, Klamath County, OR, Hydrologic Unit 18010203, Winema National Forest, on east side of lake at Rattlesnake Point on highway 97 and 0.6 miles west of community of Algoma. Gage house is at mile post 265.8 at Algoma Road intersection with Highway 97.
DRAINAGE AREA - 3,810 mi². approximately, including 26.2 mi2 in closed basin of Crater Lake.
SURFACE-WATER RECORDS
PERIOD OF RECORD - September 1974 to September 1986, October 1986 to current year.
GAGE - Water-stage recorder.
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. Elevations are often affected by wind and wind-caused seiche.
EXTREMES FOR PERIOD OF RECORD - Maximum elevation, 4,143.61 ft Apr. 27, 2000; minimum, 4,138.4 ft Oct. 24, 2022.
