USGS Current Conditions for USGS 01171500 MILL RIVER AT NORTHAMPTON, MA

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Introducing The Next Generation of USGS Water Data for the Nation
NOTICE 09-08-2020: The NWIS Mapper is experiencing intermittent issues. Developers are looking into the problem. Thank you for your patience.
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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.

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USGS 01171500 MILL RIVER AT NORTHAMPTON, MA

PROVISIONAL DATA SUBJECT TO REVISION

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LOCATION--Lat 42°19'08", long 72°39'56", Hampshire County, Hydrologic Unit 01080201, on left bank, 5 ft downstream from Clement Street bridge near Northampton, and about 4 mi upstream from mouth. Prior to October 1, 2002, gage located at lat 42^o19’05”, long 72^o39’21”, on right bank about 2.5 mi downstream, at different datum.
DRAINAGE AREA--52.6 mi².
PERIOD OF RECORD--Discharge: October 1938 to current year. October 1938 monthly discharge only, published in WSP 1301.
Water-quality records: Water years 1957–59, 1971, 1973, 1994, 2003–05.
REVISED RECORDS--WSP 921: 1940. WSP 1231: 1940–42(M), 1944–45(M), 1948(M), 1949;WDR MA-RI-03-1: drainage area.
GAGE--Data Collection Platform with satellite telemeter. Datum of gage is 169.34 ft above NAVD 1988, estimated from topographic map. Prior to May 8, 2020, datum reported as 170 ft above NGVD 1929, estimated from topographic map. Prior to Oct. 1, 2002, gage was at 140 ft elevation, at different datum, and was discontinued due to unstable channel conditions.
REMARKS--Prior to Oct. 1, 2002, flow regulated by mill upstream of original gage location.
COOPERATION BY--Massachusetts Department of Conservation and Recreation, Office of Water Resources.