LOCATION--Lat 42°46’22", long 71°04’59", Essex County, Hydrologic Unit 01070002, on left bank  upstream from Rt 125 bridge at Haverhill.
DRAINAGE AREA--4,850 mi² of which 214 mi² probably is noncontributing.
PERIOD OF RECORD--July 2006 to current year.
GAGE--Data Collection Platform with satellite telemeter. Datum of gage is 0.80 ft below NAVD 1988. Prior to May 8, 2020, datum reported as NGVD 1929.
REMARKS--Stage affected by tidal fluctuations. Intake out of water at stages below approximately -0.30 ft.
COOPERATION BY--Massachusetts Department of Conservation and Recreation, Office of Water Resources.