PROVISIONAL DATA SUBJECT TO REVISION

Station operated in cooperation with PacifiCorp.

NOTE: For combined weighted mean lake elevations please go to Lakes and Reservoirs (11507001).
STATION.-- 11507000 UPPER KLAMATH LAKE NEAR KLAMATH FALLS, OR
LOCATION.--Lat 42° 15'00", long 121° 48'55", in NW 1/4 SW 1/4 sec.19, T.38 S., R.9 E., Klamath 
County, 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.
PERIOD OF RECORD.--May 1904 to September 1922 (gage heights only); October 1922 to September 1974 
(elevation); October 1974 to current year.
GAGE.--Water-stage recorder. Datum of gage is 4,098.22 ft above NGVD of 1929, or 4,100.00 ft 
above Bureau of Reclamation (BOR) datum. Gage readings have been reduced to elevations above Bureau 
of Reclamation datum. Stage using BOR datum -1.78 ft = stage using NGVD 1929 datum. This is a 
supplementary gage to the base gage at Upper Klamath Lake near Klamath Falls (Weight/Mean Elevations) 
(11507001).