USGS Water-Year Summary 2021
01100627 SHAWSHEEN RIVER AT BALMORAL ST AT ANDOVER, MA
LOCATION - Lat 42°40'17", long 71°08'59" referenced to North American Datum of 1927, Essex County, MA, Hydrologic Unit 01070002, Located about 70 feet back from the right bank of the Shawsheen River and about 160 feet upsteam of Balmoral Street Bridge over the Shawsheen River in Andover.
DRAINAGE AREA - 72.8 mi².
PERIOD OF RECORD - October 2006 to June 2012. February 2013 to current year.
GAGE - Water-stage recorder with satellite telemeter. Datum of gage is 40 ft above National Geodetic Vertical Datum of 1929, from topographic map.
COOPERATION - Town of Andover.