LOCATION.--Lat 42°55'05.6", long 77°13'58.0" referenced to North American Datum of 1983, Ontario County, NY, Hydrologic Unit 04140201, on right bank at Chapin, 25 ft upstream from bridge on State Highway 488, and 4.1 mi downstream from Canandaigua Lake.
DRAINAGE AREA.--195 mi².
PERIOD OF RECORD.--November 1939 to current year. Prior to October 1964, published as "Canandaigua Lake Outlet."
REVISIONS HISTORY.--WSP 2112: Drainage area.
GAGE.--Water-stage recorder. Datum of gage is 671.44 ft above NGVD of 1929 and 670.92 ft above NAVD of 1988. Prior to June 25, 1974, at site 0.1 mi upstream at datum 5.46 ft higher.
REMARKS.--Flow regulated by Canandaigua Lake, from which water is diverted for municipal supply by Villages of Newark, Palmyra, and Gorham. Monthly runoff adjusted for change in contents in Canandaigua Lake from October 1945 to September 1966.
Water Years 2014-17: Records good except those for estimated daily discharges, which are fair. Water Years 2018-19: Records fair except those for estimated daily discharges, which are poor. Water Years 2020-23: Records good except those for estimated daily discharges, which are poor.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 1,710 ft³/s, June 24, 1972, gage height, 5.62 ft, site and datum then in use; maximum gage height, 6.61 ft, Apr. 2, 1993; minimum discharge, 4.4 ft³/s, Sept. 24, 1991.

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