PROVISIONAL DATA SUBJECT TO REVISION

LOCATION.--Lat 44° 25'00", long 111° 23'41" (NAD83), in SW1/4 SW1/4 sec.28, 
   T.13 N., R.43 E., Fremont County, Hydrologic Unit 17040202, Island Park Dam quad., 
   Targhee National Forest, on left bank 0.2 mi downstream from Island Park Dam, 
   0.2 mi upstream from Buffalo River, 1 mi southwest of Island Park Post Office, 
   and at mile 91.5.

DRAINAGE AREA.--481 mi2. Mean elevation, 7,080 ft.

PERIOD OF RECORD.--January 1933 to current year.

REVISED RECORDS.--WSP 1217: Drainage area. 

GAGE.--Elevation of gage is 6,225 ft above NGVD of 1929, from river-profile map. 
   Prior to May 15, 1935, non-recording gage at site about 0.8 mi upstream at 
   different datum. May 15 to Nov. 30, 1935, water-stage recorder at site 
   1,000 ft downstream at different datum.

REMARKS.--Flow regulated by Henrys Lake (see sta 13039000) and Island Park 
   Reservoir. Diversions above station for irrigation of about 15,500 acres 
   (1966 determination), a considerable part of which consists of partly 
   subirrigated meadows.

EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 3,030 ft3/s May 23, 1984, 
   gage height, 6.06 ft; minimum daily, 1.0 ft3/s Nov. 16 to Dec. 7, 1938.

Current shift-adjusted rating in tab-separated format.
These are updated daily and can change often! If you use these ratings it is important that you update often so that you have the most current version.
What is a shift-adjusted rating?

River forecasts and additional data are available at the National Weather Service Advanced Hydrologic Prediction Services web page.

Station operated in cooperation with U.S. Bureau of Reclamation.

Realtime Gage Height data is provided by U.S. Bureau of Reclamation telemetry.