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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.
LOCATION--Lat 42° 38’12", long 71°
18’09", Middlesex County, Hydrologic Unit 01070005, on right
bank 300 ft downstream from Rogers Street Bridge at Lowell, 0.3 mi
downstream from River Meadow Brook, and 0.8 mi upstream from
DRAINAGE AREA--Total above gage, 400 mi2; net above gage, 307 mi2 — diversion as needed from 92.6 mi2 for use by Boston metropolitan district.
PERIOD OF RECORD--Discharge: October 1936 to current year. October, November 1936 monthly discharge only, published in WSP 1301.
Water-quality records: Water years 1953, 1967–74.
REVISED RECORDS--WDR MA-RI-84-1: drainage area.
GAGE--Data Collection Platform with satellite telemeter. Datum of gage is 66.60 ft above NAVD 1988. Datum previously reported as 67.41 ft above NGVD 1929.
REMARKS--Low flow regulated by mills upstream. Daily discharge includes undiverted water from 92.6 mi2 in basins of Sudbury River and Lake Cochituate. Prior to December 1961, diversion upstream for use by city of Lowell.
COOPERATION BY--Massachusetts Department of Conservation and Recreation, Office of Water Resources.
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Value Aug 11