LOCATION.--Lat 43°04'08", long 74°59'18" referenced to North American Datum of 1983, Herkimer County, NY, Hydrologic Unit 02020004, on right bank 600 ft downstream from bridge on old State Highway 28 at Kast Bridge, 1.2 mi downstream from North Creek, 2.2 mi north of Herkimer, and 4.0 mi upstream from mouth.
DRAINAGE AREA.--560 mi².
PERIOD OF RECORD.--January 1907, April to December 1907, March 1908 to December 1909, April 1910 to December 1911 (monthly discharges only, published in WSP 1302), January 1912 to December 1913, April 1914 to June 1918 (monthly discharges only for most months, published in WSP 1302), October 1920 to current year. Record prior to October 1920 furnished by State engineer and surveyor of New York.
REVISED RECORDS.--WDR NY-85-1: Drainage area.
GAGE.--Water-stage recorder and crest-stage gage. Datum of gage is 438.99 ft above NGVD of 1929. Prior to Sept. 18, 1920, nonrecording gage at former highway bridge 500 ft upstream at different datum. Sept. 18, 1920 to Oct. 23, 1985, at site on left bank at present datum.
REMARKS.--Since March 1914, flow regulated by Hinckley Reservoir, 31 mi upstream from station (usable capacity, 3,320 mil ft³). Diurnal fluctuation at low and medium flow caused by powerplants upstream from station. Diversion at Trenton Falls, 26 mi upstream from station, by Ninemile feeder since 1915 during canal navigation season. Diversion from Hinckley Reservoir for Utica water supply returned to Mohawk River. Water Years 2014-15: Records good except those for estimated daily discharges, which are poor.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, since construction of Hinckley Reservoir in 1914, 25,300 ft³/s, June 28, 2013, gage height, 9.01 ft; maximum gage height, 10.47 ft, probably Feb. 17, 1943 (ice jam), from floodmark in gage well; minimum discharge, 20 ft³/s, Sept. 3, 1929, gage height, 0.90 ft.
EXTREMES FOR PERIOD PRIOR TO REGULATION.--Maximum discharge, prior to construction of Hinckley Reservoir in 1914, 23,300 ft³/s, Mar. 26, 1913, from reports of State engineer and surveyor of New York.

Peak Flow and Stage Information