LOCATION.--Lat 42°56'01.8", long
78°54'18.0" referenced to North American Datum of
1983, Erie County, NY, Hydrologic Unit 04120104, at Black Rock
Lock adjacent to U.S. Army Corps of Engineers installation at
foot of Hamilton Street, Buffalo and 0.2 mi downstream from
International railroad bridge.
DRAINAGE AREA.--263,700 mi².
PERIOD OF RECORD.--October 1984 to March 1997, November
1998 to current year.
GAGE.--Water-stage recorder and crest-stage gage. Datum
of gage is International Great Lakes Datum (IGLD) of 1985.
Prior to Oct. 1, 1991, datum of gage was IGLD of 1955, 0.57 ft
lower (previously published as 0.67 ft lower).
EXTREMES FOR PERIOD OF RECORD.--Maximum elevation,
571.05 ft, Dec. 2, 1985, present datum; minimum daily
elevation, 561.92 ft, Jan. 14, 1999.