USGS Water-Year Summary 2021
14299800 NEHALEM RIVER NEAR VERNONIA, OR
LOCATION - Lat 45°48'26", long 123°16'55" referenced to North American Datum of 1927, in NE 1/4 NE 1/4 sec.27, T.4 N., R.5 W., Columbia County, OR, Hydrologic Unit 17100202, on left bank, 6.75 mi southwest of Vernonia and at mile 100.7.
DRAINAGE AREA - 69.78 mi².
PERIOD OF RECORD - July 2001 to current year.
GAGE - Water-stage recorder and crest-stage gage. Elevation of gage is 640 ft above NGVD of 1929, from topographic map.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of Feb. 8, 1996, reached a stage of about one foot lower than that of Dec. 3, 2007, according to knowledgeable local resident; discharge about 15,100 ft³/s, from rating curve extended above 9,400 ft³/s on basis of slope-area measurement of peak flow.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 17,600 ft³/s Dec. 3, 2007, gage height, 18.61 ft, from rating curve extended above 9,400 ft³/s on basis of slope-area measurement of peak flow; maximum gage height, 19.13 ft Dec. 3, 2007; minimum discharge, 1.3 ft³/s Sept. 6, 8, 9, 2006, Sept. 12, 13, 2007.
PERIOD OF RECORD - PRECIPITATION: October 2009 to February 2014, October 2015 to current year.
INSTRUMENTATION - Unshielded, standard 8-in diameter, tipping-bucket precipitation gage, mounted atop gage shelter with top of collector 20 ft above land surface.