USGS Water-Year Summary 2023
01100500 MERRIMACK RIVER AT LAWRENCE, MA
- Lat 42°42'17.4", long 71°09'11.3" referenced to North American Datum of 1983, Essex County, MA, Hydrologic Unit 010700,
on left bank, 20 ft downstream from Union Street in Lawrence, MA.
DRAINAGE AREA - 4,672 mi² of which 214 mi² probably is noncontributing.
PERIOD OF RECORD - August 2012 to current year.
GAGE - Data Collection Platform with satellite telemeter. Datum of gage is NAVD 1988, from levels.
COOPERATION - Massachusetts Department of Conservation and Recreation, Office of Water Resources.
EXTREMES FOR PERIOD OF RECORD - Maximum gage height, 21.25 ft, Feb. 27, 2016; minimum gage height <7.61 ft, multiple periods. Minimum operating limit of the gage is 7.61 ft.