months, stage and discharge may be affected by ice in the
channel. Data values reported on these pages may be
significantly higher or lower than the actual streamflow.
Adjustments to the data will be done after detailed analyses.
Ice affected values identified on graphs (•) may be viewed by choosing the table
output format. If you have questions about these values,
please contact the
Idaho Water Data Maintainer.
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.--501 mi2. Mean elevation, 7,080 ft.
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
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.