LOCATION--Lat 42°42’17.4", long 71°09’11.3", Essex County, Hydrologic Unit 01070002, on left bank, 50 ft downstream from Union Street (Duck Bridge) at Lawrence, MA.
DRAINAGE AREA--Total above gage, 4,672 mi² of which 214 mi² is probably non-contributing.
PERIOD OF RECORD-- August 2012 to current year.
GAGE--Data Collection Platform with satellite telemeter. Datum of gage is NAVD 1988, from levels.
COOPERATION BY--Massachusetts Department of Conservation and Recreation, Office or Water Resources.
REMARKS--Stage-only data are available.
KEY FLOOD ELEVATIONS--Top of concrete retaining wall below Duck Bridge, 23.28 ft, NAVD 1988.