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USGS Water-Year Summary 2024
13325000 EAST FORK WALLOWA RIVER NR. JOSEPH, OR.
LOCATION - Lat 45°16'15.97", long 117°12'40.77" referenced to North American Datum of 1983, in SE 1/4 NE 1/4 sec.29, T.3 S., R.45 E., Wallowa County, OR, Hydrologic Unit 17060105, on right bank, 0.3 mi upstream from confluence with West Fork Wallowa River, 1.1 mi upstream from Wallowa Lake.
DRAINAGE AREA - 10.3 mi².
REVISIONS HISTORY - WSP 1247: 1931, 1937(M), 1948-49, records for river station; 1948, records for tailrace station. WSP 1737: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - July 1924 to September 1952; October 1967 to September 1983 at location 0.1 mi. downstream. August 2017 to current year. October 1952 to September 1983 records include flow in Wallowa Falls powerplant tailrace of Pacific Power & Light Co. (now called PacificCorp).
GAGE - Water-stage recorder and crest-stage gage. Elevation of gage is 4,540 ft above NGVD of 1929. July 1924 to September 1983 at location 0.1 mi. downstream, at different datum. Prior to April 8, 1950, non-recording gage at different datum and site.
REMARKS - Records are good. July 1924 to September 1983 records include flow in Wallowa Falls powerplant tailrace of Pacific Power & Light Co. (now called PacifiCorp). Most of the low flow is diverted at dam 1.4 mi upstream into a conduit 1.0 mi above Wallowa Falls powerhouse and discharged into West Fork 0.4 mi below powerhouse. Maximum diversion is about 16 ft³/s.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 450 ft³/s July 25, 1937, minimum discharge, 3.2 ft³/s Nov. 2, 2017.
