LOCATION.--Lat 43°00'23.7", long 75°02'30.0" referenced to North American Datum of 1983, Herkimer County, NY, Hydrologic Unit 02020004, on left bank at downstream side of bridge on Frederick Street in Ilion, and 1.2 mi upstream from mouth.
DRAINAGE AREA.--26.4 mi².
PERIOD OF RECORD.--Annual maximum only--1964-66, 1969, 1971-83, 1985-86, 2000. Miscellaneous measurements--2002-03. November 1966 to September 1968, October 2014 to current year.
REVISIONS HISTORY.--WDR-NY-83-1: 1972-82(M).
GAGE.--Water-stage recorder and crest-stage gage. Datum of gage is 426.52 ft above NAVD of 1988. Prior to October 2014, nonrecording gages at site 0.4 mi upstream at datum 34.42 ft higher. October 2014 to July 8, 2020, at same site but at datum 8.69 ft higher. July 8, 2020 to Sept. 9, 2021, at site 0.2 mi downstream at different datum.
REMARKS.--Water Years 2015-23: Records fair except those for estimated daily discharges, which are poor.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 2,100 ft³/s, May 13, 2000, gage height, 5.69 ft, site and datum then in use, from rating curve extended above 450 ft³/s on basis of contracted-opening measurement at gage height 4.93 ft, site and datum then in use; minimum discharge, 4.4 ft³/s, Aug. 7, 2018.

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Peak Flow and Stage Information

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