PROVISIONAL DATA SUBJECT TO REVISION

LOCATION.--Lat 44° 04'11", long 111° 30'38" (NAD83), in NW1/4 NE1/4 NW1/4 
   sec.33, T.9 N., R.42 E., Fremont County, Lemon Lake quad., Hydrologic Unit 
   17040203, on left bank 0.8 mi downstream from powerplant, 3.1 mi west of Ashton, 
   and at mile 44.2.

DRAINAGE AREA.--1,040 mi2. Mean elevation, 6,710 ft.

PERIOD OF RECORD.--April 1890 to June 1891, August 1902 to June 1909, 
   April 1920 to current year (seasonal records only 1920-26). Monthly 
   discharge only for some periods, published in WSP 1317. Published as 
   "Henrys Fork in canyon, above Fall River", 1890-91, and as "North 
   Fork of Snake River near Ora", 1902-09. Published as station number 
   13046023 from 1981-92.

REVISED RECORDS.--WSP 1217: Drainage area. WSP 1347: 1890-91. WDR ID-95-1: 1993(M).

GAGE.--Elevation of gage is 5,090 ft above NGVD of 1929, from topographic map. 
   April 1890 to June 1891, nonrecording gage at site 5.5 mi downstream at 
   different datum. August 1902 to Apr. 15, 1921, nonrecording gage, and 
   Apr. 16, 1921 to May 3, 1930, water-stage recorder at site 1.0 mi 
   downstream at different datum. May 3, 1930 to Sept. 30, 1980, 
   water-stage recorder at site 0.5 mi upstream at different datum.

REMARKS.--Diurnal fluctuation caused by powerplant above station. Flow 
   regulated by Henrys Lake (see sta 13039000), Island Park Reservoir, and 
   by Ashton Dam, 0.8 miles upstream. Diversions above station for irrigation 
   of about 24,500 acres (1966 determination).

EXTREMES FOR PERIOD OF RECORD.--
   UNREGULATED PERIOD (1891-1922): Maximum discharge prior to regulation, 
   6,000 ft3/s May 8, 1890; minimum daily, 910 ft3/s Feb. 4, 1906.  

   REGULATED PERIOD (1923 to current year): Maximum discharge since regulation began, 
   8,140 ft3/s May 15, 1984, gage height, 6.50 ft; minimum, 53 ft3/s Sept. 20, 1960, 
   gage height, 5.45 ft, site and datum then in use; 
   minimum daily, 171 ft3/s Oct. 18, 1961.

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?

Station operated in cooperation with Water District No.1.

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