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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° 42'01", long 73° 09'34",
Berkshire County, Hydrologic Unit 02020003, on left bank 0.3 mi
downstream from Sherman Brook and 2.7 mi east of junction of U.S.
Highway 7 and State Highway 2 in Williamstown.
DRAINAGE AREA--126 mi2.
PERIOD OF RECORD--Discharge: July 1940 to current year.
Water-quality records: Water years 1953–54, 1957–58, 1967–69.
GAGE--Data Collection Platform with satellite telemeter. Datum of gage is 615.45 ft above North American Vertical Datum of 1988. Prior to June 6, 1979, at site 1.2 mi downstream at different datum.
REMARKS--Prior to 1966, slight diurnal fluctuation at low flow caused by mills upstream. Some regulation by Cheshire Reservoir 16 mi upstream. Satellite gage-height telemeter at station.
COOPERATION BY--Massachusetts Department of Conservation and Recreation, Office of Water Resources.
|For more information on the areal exent and depth of flood inundation during flooding at and near this streamgage go to the Flood Inundation Mapper|
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Value Feb 20