LOCATION--Lat 42^o09'13", long 71^o39'09", Worcester County, Hydrologic Unit 01090003, on left bank at Northbridge, 100 ft downstream from Sutton Street Bridge and 3.0 mi downstream from Quinsigamond River.
DRAINAGE AREA--141 mi².
PERIOD OF RECORD--Discharge: October 1939 to September 1977; October 1995 to September 2003 (discharge record discontinued). October and November 1939, monthly discharge only, published in Water-Supply Paper (WSP) 1301.
Water-quality records: Water years, 1955, 1958, 1971.
GAGE--Data Collection Platform with satellite telemeter. Elevation of gage is 255.00 ft above National Geodetic Vertical Datum of 1929. To adjust gage-height readings to sea level, add 255.00 ft.
REMARKS--Published discharge record discontinued on September 30, 2003. Stage affected by three upstream waste-water treatment plants and upstream and downstream reservoirs.
FLOOD STAGE--Flood stage of 9 ft determined by National Weather Service.
PROVISIONAL DISCHARGE DURING FLOODS--Provisional discharge data are available when gage height equals or exceeds 4.5 ft (525 ft³/s). Discharge data for gage heights less than 4.5 ft are not available due to variations in the stage-discharge relation.
COOPERATION BY--Massachusetts Department of Conservation and Recreation, Office of Water Resources.