LOCATION--Lat 42^o24'39", long 71^o47'30", Worcester County, Hydrologic Unit 01070004, on left bank at downstream side of bridge on Muddy Pond Road, 1.5 mi upstream from mouth and 2.5 mi southwest of Sterling.
DRAINAGE AREA--29.1 mi².

WATER-DISCHARGE RECORDS

PERIOD OF RECORD--Low-flow partial record measurements in water years 1971-73, 1991-93. Continuous stage data recorder April 1994 to current year.
GAGE--Data Collection Platform with satellite telemeter. Datum of gage is 399.28 ft above NAVD 1988, estimated from topographic map. Prior to May 13, 2020 datum of gage reported as 400 ft above NGVD 1929, estimated from topographic map.
REMARKS--Stage-discharge relation affected by seasonal backwater from aquatic vegetation and occasional backwater from beaver dams. Adjustments for backwater are included in the computed record.

WATER-QUALITY RECORDS

PERIOD OF RECORD--Water temperature and specific conductance, April 1998 to current year; precipitation October 1998 to current year.
INSTRUMENTATION--Water temperature and specific conductance monitor and heated tipping-bucket precipitation gage.
Daily and unit values for precipitaion are calibrated and quality assured prior to publication by the USGS MA-RI Field Office. Data are available upon request.

This gage is monitored in cooperation with the Massachusetts Department of Conservation and Recreation, Division of Water Supply Protection, Office of Watershed Management, with funding from the Massachusetts Water Resources Authority .

Photo of Stillwater River Gage.

Photo of Stillwater gage

Boating safety tips