USGS Water-Year Summary 2021
14207740 WILLAMETTE RIVER ABOVE FALLS, AT OREGON CITY, OR
LOCATION - Lat 45°20'55", long 122°37'08" referenced to North American Datum of 1927, in SW 1/4 SW 1/4 sec.31, T.2 S., R.2 E., Clackamas County, OR, Hydrologic Unit 17090007, on right bank, 0.2 mi upstream from Willamette Falls, 1.6 mi downstream from Tualatin River and at mile 26.8.
DRAINAGE AREA - 10,000 mi². approximately.
PERIOD OF RECORD - October 1976 to current year (gage heights only).
GAGE - Water-stage recorder. Datum of gage is NGVD of 1929.
EXTREMES FOR PERIOD OF RECORD - Maximum gage height, 69.47 ft Feb. 9, 1996; minimum gage height, 52.51 ft July 12, 1992.