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Station operated in cooperation with the Wallowa Soil and Water Conservation
District.
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: The most current shifted rating for this site can be found at USGS Rating Depot website.
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