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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 01097000 ASSABET RIVER AT MAYNARD, MA

PROVISIONAL DATA SUBJECT TO REVISION

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LOCATION--Lat 42° 25’55", long 71° 27’01", Middlesex County, Hydrologic Unit 01070005, on right bank at Maynard, 150 ft upstream from bridge on State Highway 27, 1.7 mi downstream from Assabet Brook, and 7.1 mi upstream from confluence with Sudbury River.
DRAINAGE AREA--114 mi2.
PERIOD OF RECORD--Discharge: July 1941 to current year.
Water-quality records: Water years 1954, 1967–74.
REVISED RECORDS--WSP 1231: 1945–46.
GAGE--Data Collection Platform with satellite telemeter. Datum of gage is 142.12 ft above National Geodetic Vertical Datum of 1929.
REMARKS--Occasional diurnal fluctuation at low flow by mills upstream; greater regulation prior to 1969. Since 1962, high flow affected by retarding reservoirs and, since 1970, occasional release at low flow by these reservoirs.
COOPERATION BY--Massachusetts Department of Conservation and Recreation, Office of Water Resources.


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This station managed by the Northborough MA Field Office.

Available Parameters Available Period
All 2 Available Parameters for this site
  
00060 Discharge 1990-09-30  2017-09-25
00065 Gage height 2007-10-01  2017-09-25

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Summary of all available data for this site
Instantaneous-data availability statement


Discharge, cubic feet per second

Most recent instantaneous value: 21.9 09-25-2017   07:15 EDT
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Daily discharge, cubic feet per second -- statistics for Sep 25 based on 76 years of record more
Min
(1957)
Most Recent
Instantaneous
Value Sep 25
25th
percen-
tile
Median Mean 75th
percen-
tile
Max
(2011)
3.60 21.9 25 37 71 86 400


Gage height, feet

Most recent instantaneous value: 1.32 09-25-2017   07:15 EDT
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