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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
- For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
- For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
- For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
- Not all sites have reports available for every water year.
USGS Water-Year Summary 2024
03010820 ALLEGHENY RIVER AT OLEAN, NY
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.
SURFACE-WATER RECORDS
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 2016-24: Records good except those for estimated daily discharges, which are poor.
Water Year 2015: Records fair except those for estimated daily discharges, which are poor.
Water Years 2016-24: Records good except those for estimated daily discharges, which are poor.
EXTREMES OUTSIDE PERIOD OF RECORD - Maximum discharge, 59,000 ft³/s, June 23, 1972, provided by the U.S. Army Corps of Engineers.
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.
