LOCATION.--Lat 42°04'20.5", long 78°27'03.1" referenced to North American Datum of 1983, Cattaraugus County, NY, Hydrologic Unit 05010001, on right bank in sewage treatment facility pump house, 1.6 mi downstream from Olean Creek, in Olean.
DRAINAGE AREA.--1,168 mi².
PERIOD OF RECORD.--Occasional miscellaneous discharge measurements, water years 1967-69, 1971, 1997-98. August 2010 to current year.
GAGE.--Water-stage recorder. Datum of gage is 1,399.50 ft above NAVD of 1988. Prior to Oct. 1, 2018, at datum 2.00 ft higher.
REMARKS.--Water Year 2014: Records good except those for estimated daily discharges, which are fair.
Water Year 2015: Records fair except those for estimated daily discharges, which are poor.
Water Years 2016-23: Records good except those for estimated daily discharges, which are poor.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 27,300 ft³/s, Dec. 2, 2010, gage height, 17.74 ft, present datum; minimum discharge, 70 ft³/s, Sept. 28, 29, 2020, gage height, 0.72 ft.
EXTREMES OUTSIDE PERIOD OF RECORD.--Maximum discharge, 59,000 ft³/s, June 23, 1972, provided by the U.S. Army Corps of Engineers.

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