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ICE EFFECTS ON STREAMFLOW During winter, ice formation may cause stage and discharge values to appear higher than expected. Ice effects may be minor (occurring only at night and early morning) with baseline flows obvious, or the effects may be major (stage constantly increases over several days or weeks) resulting in greatly erroneous discharge. Streamgages experiencing minor ice conditions will continue to display stage and discharge values to enable users to estimate the approximate base-line stage and discharge. Streamgages experiencing major ice conditions will have the discharge record temporarily disabled to prevent use of erroneous discharge values. The discharge record will resume when it is determined that ice conditions are no longer present. Daily mean discharges during periods of ice effect will be estimated after detailed data analysis.

USGS 01096000 SQUANNACOOK RIVER NEAR WEST GROTON, MA

PROVISIONAL DATA SUBJECT TO REVISION

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LOCATION--Lat 42° 38’03", long 71° 39’30", Middlesex County, Hydrologic Unit 01070004, on left bank 0.7 mi downstream from Trout Brook and 2.7 mi northwest of West Groton.
DRAINAGE AREA--63.7 mi2, excludes 2.16 mi2, above outlet of Ashby Reservoir.
PERIOD OF RECORD--Discharge: October 1949 to current year.
Water-quality records: Water year 1957.
REVISED RECORDS--WDR MA-RI-84-1: drainage area.
GAGE--Data Collection Platform with satellite telemeter. Datum of gage is 244.27 ft above National Geodetic Vertical Datum of 1929.
REMARKS--Occasional regulation at low flow by mill upstream; regulation greater prior to 1961. Entire flow from 2.16 mi2 upstream from outlet of Ashby Reservoir diverted for municipal supply of Fitchburg except for occasional periods of spill.
COOPERATION BY-- Massachusetts Department Of Conservation and Recreation, Office of Water Resources.


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Available Parameters Available Period
All 2 Available Parameters for this site
   
00060 Discharge 1990-09-30  2017-07-26
00065 Gage height 2007-10-01  2017-07-26

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Instantaneous-data availability statement

Discharge, cubic feet per second
Most recent instantaneous value: 36.1 07-26-2017   18:00 EDT
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Daily discharge, cubic feet per second -- statistics for Jul 26 based on 67 years of record more
Min
(2016)		 25th
percen-
tile		 Median Mean 75th
percen-
tile		 Most Recent
Instantaneous
Value Jul 26		 Max
(2009)
5.46 15 21 32 32 36.1 308

Gage height, feet
Most recent instantaneous value: 1.86 07-26-2017   18:00 EDT
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