LOCATION.--Lat 44°50'20.0", long 74°58'44.0" referenced to North American Datum of 1983, St. Lawrence County, NY, Hydrologic Unit 04150305, on right bank 250 ft upstream from bridge on Grant Road at Raymondville, 0.3 mi downstream from Trout Brook, 0.4 mi downstream from powerplant, and 18.0 mi upstream from mouth.
DRAINAGE AREA.--1,125 mi².
PERIOD OF RECORD.--November 1943 to current year.
REVISIONS HISTORY.--WDR NY-82-1: Drainage area. WDR NY-85-1: 1983-84.
GAGE.--Water-stage recorder and crest-stage gage. Datum of gage is 183.33 ft above NGVD of 1929 and 182.94 ft above NAVD of 1988.
REMARKS.--Extensive diurnal fluctuation caused by power and industrial operations. Flow regulated since 1953 by Carry Falls Reservoir, about 46 mi upstream, and by powerplant, 0.4 mi upstream; considerable natural storage in large lakes upstream from Piercefield.
Water Years 2014-23: Records good except those for estimated daily discharges, which are poor.

EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 14,100 ft³/s, May 4, 2011, gage height, 8.72 ft; maximum gage height, 9.24 ft, Feb. 22, 1954 (ice jam); minimum discharge, 2.2 ft³/s, Sept. 18, 19, 1966; minimum gage height, 0.42 ft, July 13, 1950.

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