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LOCATION--Lat 42° 25’55", long 71° 27’01", Middlesex County, Hydrologic Unit 01070005, on right bank at Maynard, 150 ft upstream from bridge on State Highway 27, 1.7 mi downstream from Assabet Brook, and 7.1 mi upstream from confluence with Sudbury River.
PERIOD OF RECORD--Discharge: July 1941 to current year.
Water-quality records: Water years 1954, 1967–74.
REVISED RECORDS--WSP 1231: 1945–46.
GAGE--Data Collection Platform with satellite telemeter. Datum of gage is 142.12 ft above National Geodetic Vertical Datum of 1929.
REMARKS--Occasional diurnal fluctuation at low flow by mills upstream; greater regulation prior to 1969. Since 1962, high flow affected by retarding reservoirs and, since 1970, occasional release at low flow by these reservoirs.
COOPERATION BY--Massachusetts Department of Conservation and Recreation, Office of Water Resources.

ICE EFFECTS ON STREAMFLOW During winter, ice formation in streams can cause stage and corresponding discharge values to appear higher than expected during periods of no precipitation. Ice effects from partial ice cover or shore ice may be minor, where stage and discharge appear to increase at night and decrease to base-line conditions around midday for one or more days. Major ice effects from complete ice cover appear as constantly increasing stage and discharge over several days during prolonged cold periods. Stage and discharge values for streams experiencing minor ice effects will continue to be displayed on the web to enable the user to estimate the approximate base-line discharges. Note that this method of estimation should only be used when no runoff occurs. During periods of major ice effects, display of discharge data on the web will be temporarily discontinued to prevent misuse of erroneous discharge data. The discharge record will resume when it is determined that ice conditions are no longer present. Display of stage data during periods of minor and major ice effects will continue to be displayed on the web. Daily mean discharges will be estimated for all periods of ice-effected discharges.

Boating safety tips
This station managed by the Northborough, MA Field Office.

Available Parameters Available Period
All 2 Available Parameters for this site
00060 Discharge 2007-10-01  2016-05-31
00065 Gage height 2007-10-01  2016-05-31

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Instantaneous-data availability statement

Discharge, cubic feet per second

Most recent instantaneous value: 58   05-31-2016  11:15 EDT
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Daily discharge, cubic feet per second -- statistics for May 31 based on 74 years of record more
Most Recent
Value May 31
Median Mean 75th
37 58 97 154 186 207 991

Gage height, feet

Most recent instantaneous value: 1.89   05-31-2016  11:15 EDT
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