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The formation of ice on rivers can cause discharge values to appear unusually high. Display of these erroneous discharge data may result in improper assessment of flow conditions and misuse of the data. For this reason, display of discharge values for streams significantly affected by ice may be disabled from view. Display of discharge data will resume when ice conditions are no longer present. Discharge values for streams minimally affected by ice will continue to be displayed. Flows for streams with these conditions appear to increase during the night and decrease to near-base-line conditions around midday. To estimate the correct discharge for these streams, use the flow rate that corresponds to the bottom of the discharge curve, rather than the peak that corresponds to the top of the curve. Note that this method of estimation is possible only when no surface runoff is occurring. Daily mean discharges for periods of both significant and minimal ice-effect will be estimated and published in the Annual Water-Data Report for the water year in which they occurred.

* IMPORTANT: Next Generation Station Page



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LOCATION--Lat 42o11'20", long 71o45'56", Worcester County, Hydrologic Unit 01090003, on right bank, approximately 20 ft downstream from West Main Street bridge, 2 mi downstream from Kettle Brook, and 2.5 mi downstream from effluent discharge channel of Upper Blackstone Water Pollution Abatement District waste-water treatment plant, at Millbury, MA.
DRAINAGE AREA--71.4 mi2.
PERIOD OF RECORD--July 2002 to current year.
GAGE--Data Collection Platform with satellite telemeter. Datum of gage is 379.35 ft above NAVD 1988, estimated from topographic map. Prior to May 4, 2020, datum of gage reported as 380 ft above NGVD 1929, estimated from topographic map.
REMARKS--Flows affected by effluent releases from Upper Blackstone Waste-Water Treatment Plant located approximately 2.5 mi upstream from gage. High flows may include diversion flood flows through Kettle Brook diversion system with mouth located approximately 2.0 mi upstream from gage.
COOPERATION--Upper Blackstone Water Pollution Abatement District

Photo of Blackstone River gage shelter at Millbury
Photo of Blackstone River control section under W. Main Street bridge
Photo of stage sensor and mounting block

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

Available Parameters Available Period
2002-07-25  2020-09-25
2007-10-01  2020-09-25


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Summary of all available data for this site
Instantaneous-data availability statement

Discharge, cubic feet per second

Most recent instantaneous value: 49.4 09-25-2020   13:30 EDT
Graph of  Discharge, cubic feet per second

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Daily discharge, cubic feet per second -- statistics for Sep 25 based on 18 water years of record more
Most Recent
Value Sep 25
Median 75th
Mean Max
32.9 44 49.4 56 87 97 498

Gage height, feet

Most recent instantaneous value: 1.64 09-25-2020   13:30 EDT
Graph of  Gage height, feet

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