LOCATION.--Lat 44°50'47.5", long 75°04'42.4" referenced to North American Datum of 1983, St. Lawrence County, NY, Hydrologic Unit 04150304, on right bank 15 ft downstream from bridge on County Highway 36 at Chase Mills, and 21 mi upstream from mouth.
DRAINAGE AREA.--598 mi².
PERIOD OF RECORD.--October 2003 to current year.
REVISIONS HISTORY.--Discharge for the periods Sept. 18, 2005 to Sept. 19, 2005, May 16, 2011 to May 19, 2011, Apr. 14, 2014 to Apr. 18, 2014, Jan. 12, 2020 to Jan. 15, 2020, and Mar. 21, 2022 to Mar. 23, 2022 was revised on Jan. 14, 2025, based on changes to the stage-discharge rating.
GAGE.--Water-stage recorder and crest-stage gage. Datum of gage is 226.00 ft above NGVD of 1929 (revised) and 225.59 ft above NAVD of 1988.
REMARKS.--Water Years 2014-23: Records good except those for discharges above 6,000 ft³/s, which are fair, and for estimated daily discharges, which are poor.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 13,200 ft³/s, Apr. 16, 2014, gage height, 7.73 ft; maximum gage height, 10.08 ft, Mar. 10, 2005 (ice jam); minimum discharge, 50 ft³/s, Sept. 8, 9, 2007, gage height, 3.90 ft.

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