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USGS Water-Year Summary 2024
13183000 OWYHEE RIVER BELOW OWYHEE DAM, OR
LOCATION - Lat 43°39'16", long 117°15'21" referenced to North American Datum of 1983, in SE 1/4 sec.18, T.22 S., R.45 E., Malheur County, OR, Hydrologic Unit 17050110, on left bank, 0.8 mi downstream from Owyhee Dam, 20 mi southwest of Nyssa and at mile 27.3.
DRAINAGE AREA - 11,160 mi². approximately.
REVISIONS HISTORY -
WSP 983: 1941-42. WSP 1397: 1930, 1933, 1946.
Prior to Nov. 4, 2024, the NAVD of 1988 datum of gage was reported on the manuscript erroneously as 2,346.34 ft.
SURFACE-WATER RECORDS
PERIOD OF RECORD - February 1929 to current year.
GAGE - Water-stage recorder. Datum of gage is 2,346.22 ft above NAVD of 1988.
REMARKS - Flow regulated since October 1932 by Lake Owyhee (active capacity, 715,200 acre-ft) and by many smaller reservoirs. Diversion of up to 457,000 acre-ft from Lake Owyhee during the year for irrigation of lands downstream from station and outside the basin. Many smaller diversions upstream from Lake Owyhee for irrigation upstream from station. Computation of monthly and annual adjusted flows discontinued water year 1992.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 22,900 ft³/s Apr. 15, 1952, gage height, 15.70 ft; no flow for part of Aug. 8, 9, 1932, when temporary diversion tunnel at Owyhee Dam was closed.
