LOCATION.--Lat 42°56'02.4", long 74°11'30.7" referenced to North American Datum of 1983, Montgomery County, NY, Hydrologic Unit 02020004, on left bank in waterfront park at Amsterdam, and 480 ft downstream from bridge on State Highway 30.
DRAINAGE AREA.--3,152 mi².
PERIOD OF RECORD.--Miscellaneous discharge measurements, water years 1966-67. January 2015 to current year.
GAGE.--Water-stage recorder, acoustic velocity meter, and crest-stage gage. Datum of gage is 234.50 ft above NAVD of 1988.
REMARKS.--Considerable regulation of stage by Lock 11 on the Erie (Barge) Canal about 1.3 mi upstream and Lock 10 on the Erie (Barge) Canal about 3.0 mi downstream.
Water Years 2015-20: Records poor.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge 73,100 ft³/s, Nov. 1, 2019, gage height, 24.51 ft; maximum gage height, 24.76 ft, Nov. 1, 2019; minimum discharge not determined; minimum gage height, 7.56 ft, June 27, 2020.
EXTREMES OUTSIDE PERIOD OF RECORD.--Flood of Aug. 29, 2011, reached a stage of 41.94 ft, from floodmarks in downstream cabin of Lock 11 about 1.3 mi upstream, and a stage of 35.70 ft, from floodmarks in upstream cabin of Lock 10 about 3.0 mi downstream, from information provided by New York State Canal Corporation. Flood of June 29, 2006, reached stages of 38.18 ft and 28.92 ft, from floodmarks at same locations respectively.

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