USGS Water-Year Summary 2019
13290460 SNAKE RIVER AT JOHNSON BAR, IDAHO-OREGON STATE LINE
LOCATION - Lat 45°27'48", long 116°33'23" referenced to North American Datum of 1983, in SE 1/4 NE 1/4 sec.22, T.1 S., R.50 E., Wallowa County, OR, Hydrologic Unit 17060101, Old Timer Mountain (ID,OR) quad., Hells Canyon National Recreation Area, on left bank opposite lower end of Johnson Bar, 0.5 mi upstream from mouth of Sheep Creek, and at mile 229.9.
DRAINAGE AREA - 73,400 mi².
PERIOD OF RECORD - July 1959 to September 1992 (gage heights only), October 1992 to September 1995 (discharge), October 1995 to current year (gage heights only).
GAGE - Water-stage recorder. Datum of gage is 1,246.63 ft above NGVD of 1929 (revised). Published datum prior to 2010 water year is 20.39 ft lower.
COOPERATION - Gage-height records furnished by Idaho Power and reviewed by U.S. Geological Survey beginning April 2001.