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ICE EFFECTS ON STREAMFLOW
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.
29’42.23", long 71°
43’18.96", Worcester County, Hydrologic Unit 01070004, on
right bank 150 ft downstream from I-190 northbound bridge, 0.8 mi
upstream from Wekepeke Brook near Leominster.
DRAINAGE AREA.--110 mi2.
PERIOD OF RECORD.--September 1935 to current year.
GAGE.--Water-stage recorder with satellite telemeter. Elevation of gage is 265 ft above North American Vertical Datum, 1988, from digital map.
REMARKS.--Flow regulated by mills, reservoirs, and waste-water treatment plants upstream. Flow affected by diversions from 2.1 mi2 above outlet of Ashby Reservoir for municipal use. Prior to Dec. 15, 2006, gage located 0.5 mi upstream old mill dam at different datum.
COOPERATION BY-- Massachusetts Department Of Conservation and Recreation, Office of Water Resources.