LOCATION--Lat 42°19'08", long 72°39'56", Hampshire County, Hydrologic Unit 01080201, on left bank, 5 ft downstream from Clement Street bridge near Northampton, and about 4 mi upstream from mouth. Prior to October 1, 2002, gage located at lat 42^o19’05”, long 72^o39’21”, on right bank about 2.5 mi downstream, at different datum.
DRAINAGE AREA--52.6 mi².
PERIOD OF RECORD--Discharge: October 1938 to current year. October 1938 monthly discharge only, published in WSP 1301.
Water-quality records: Water years 1957–59, 1971, 1973, 1994, 2003–05.
REVISED RECORDS--WSP 921: 1940. WSP 1231: 1940–42(M), 1944–45(M), 1948(M), 1949;WDR MA-RI-03-1: drainage area.
GAGE--Data Collection Platform with satellite telemeter. Datum of gage is 169.34 ft above NAVD 1988, estimated from topographic map. Prior to May 8, 2020, datum reported as 170 ft above NGVD 1929, estimated from topographic map. Prior to Oct. 1, 2002, gage was at 140 ft elevation, at different datum, and was discontinued due to unstable channel conditions.
REMARKS--Prior to Oct. 1, 2002, flow regulated by mill upstream of original gage location.
COOPERATION BY--Massachusetts Department of Conservation and Recreation, Office of Water Resources.