PROVISIONAL DATA SUBJECT TO REVISION

Station operated in cooperation with the U.S. Army Corps of Engineers.

STATION.-- 13333000 GRANDE RONDE RIVER AT TROY, OR 

LOCATION.--Lat 45° 56'47", long 117°  26'54", in NE 1/4 NW 1/4 sec.4, T.5 N., 
   R.43 E., Wallowa County, Hydrologic Unit 17060106, on left bank 500 ft 
   downstream from bridge at Troy, 600 ft downstream from Wenaha River, and 
   at mile 45.2.[location map] 
DRAINAGE AREA.--3,275 mi2. 
PERIOD OF RECORD.--August 1944 to current year. Monthly discharge only August 1944, 
   published in WSP 1317. 
GAGE.--Water-stage recorder.  Datum of gage is 1,585.98 ft above NGVD of 1929.  
    Aug. 17, 1944, to Sept. 30, 1949, nonrecording gage at site 500 ft upstream at 
   datum 10.85 ft lower.  Oct. 1, 1949, to Sept. 5, 1963, water-stage  recorder at 
   site 500 ft upstream at datum 1.15 ft higher.  U.S. Geological Survey satellite 
   telemeter and National Weather Service telemeter at station. 
REMARKS.--Flow slightly regulated by Wallowa Lake (station 13326000) and small 
   reservoirs. Diversions for irrigation  upstream from station, chiefly in 
   vicinity of La Grande, Enterprise, and Wallowa; one transbasin diversion 
   from Big Sheep Creek and tributaries in Imnaha River basin for irrigation 
   in Wallowa Valley. 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 51,800 ft3/s, Feb. 9, 1996, gage 
   height, 13.76 ft, from rating curve extended above 20,000 ft3/s; minimum 
   discharge, 321 ft3/s Nov. 25, 1993, result of freezeup, but may have been less 
   during period of ice-effect that day.

NOTE: River forecasts and additional data can be obtained at the 
National Weather Service's Advanced Hydrologic Prediction Services web page.

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