LOCATION.--Middlesex County, Hydrologic Unit 01090001, 10 ft upstream of bridge on River Road, 300 feet downstream of gatehouse outlet from Stony Brook Reservoir, and 2.0 mi southwest of Waltham.
DRAINAGE AREA.--23.7 mi².
PERIOD OF RECORD.--October 1999 to current year.
GAGE.--Data Collection Platform with telephone telemeter. Datum of streamgage 42.14 ft above NAVD 1988, estimated from topographic map. Previously reported as 43 ft above NGVD 1929, from topographic map. Datum of reservoir gage is 80.30 ft, referenced to the City of Cambridge datum. Subtract 10.84 ft to convert to elevation above NGVD 1929. Subtract 11.70 ft to convert to elevation above NAVD 1988.
REMARKS.--Downstream flow affected by regulation of dam 500 ft upstream at outflow of Cambridge Reservoir.
COOPERATION BY.--Cambridge Water Department

Daily and unit values precipitation data are calibrated and quality assured prior to publication by the Massachusetts-Rhode Island Water Science Center. Data are available upon request.