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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°28'10.5", long
73°11'50.4", Berkshire County, Hydrologic Unit 01100005, on
right bank 250 ft downstream from Hubbard Avenue Bridge at Coltsville,
1.2 mi upstream from Unkamet Brook, and 2 mi northeast of Pittsfield.
Prior to Nov. 8, 1994, at site 200 ft upstream.
DRAINAGE AREA--57.6 mi2.
PERIOD OF RECORD--Discharge: March 1936 to current year. Prior to October 1945, published as Housatonic River at Coltsville.
Water-quality records: Water years 1963–65.
GAGE--Data Collection Platform with satellite telemeter. Datum of gage is 993.49 ft above National Geodetic Vertical Datum of 1929. Prior to Nov. 8, 1994, at site 200 ft upstream at same datum.
REMARKS--Flow regulated by powerplants upstream and, since 1949, by Cleveland Brook Reservoir, usable capacity, 214,000,000 ft3, 5.4 mi upstream; regulation greater prior to 1955. Diversion upstream from Cleveland Brook Reservoir for municipal supply of Pittsfield since May 1950. Satellite and telephone gage-height telemeter at station.
COOPERATION BY--Massachusetts Department of Conservation and Recreation, Office of Water Resources.
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Value May 25