LOCATION.--Lat 42° 59'53", long 111° 26'33" (NAD27), in NE1/4 SW1/4 sec.8, T.5 S., R.43 E., Caribou County, Wayan West quad., Hydrologic Unit 17040205, at Beaver Tail Point, 3.5 mi northwest of Wayan.

DRAINAGE AREA.--137 mi².

PERIOD OF RECORD.--June 1966 to July 1974, August 1985 to September 1987 (discontinued).

GAGE.--Water-stage recorder. Datum of gage is 6,380.00 ftabove NGVD of 1929.

REMARKS.--Since 1924 lake level has been regulated by a dam across the outlet to Willow Creek, and by a cut controlled by headgates, diverting water to Blackfoot Reservoir (sta 13065000).

EXTREMES FOR PERIOD OF RECORD.--Maximum gage height, 8.40 ft, May 5, 1971; lake surface below gage height 4.50 ft for long periods each year prior to 1969.