LOCATION--Lat 42^o22'08", long 71^o03'42", Suffolk County, Hydrologic Unit 01090001, at New Charles River Dam, Boston, MA.
DRAINAGE AREA--311 mi², excludes 23.6 mi² drained by Stony Brook, from which flow is diverted for municipal supply for Cambridge.
PERIOD OF RECORD--September 2002 to current year.
GAGE--Data Collection Platform with telephone telemeter. Stage sensor for Charles River and Boston Harbor.
DATUM--Datum of gages are from the Massachusetts Metropolitan District Commission base, which is 105.62 ft higher than NGVD 1929.
REMARKS--Charles River stage affected by operation of the New Charles River Dam and Boston Harbor stage affected by tide.
COOPERATION BY--Massachusetts Department of Conservation and Recreation, Division of Planning and Engineering

Photo of Charles River Dam
Photo of Charles River stage sensor location
Photo of Boston Harbor stage sensor location and reference staff gage