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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.



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LOCATION--Lat 42°26’50.5", long 71°08’18.9", Middlesex County, Hydrologic Unit 01090001, on left bank, 0.3 mi downstream from Waterfield Street at Winchester.
DRAINAGE AREA--Total above gage, 24.7 mi2; net above gage, 24.1 mi2, excludes 0.6 mi2 drained by Winchester North Reservoir.
PERIOD OF RECORD--April 1939 to current year. Streamgage temporarily relocated to Mt. Vernon Street from September 2011 to April 2014 during river channel improvements for flood mitigation at Mystic Valley Parkway.
GAGE--Data-collection platform, satellite telemeter, hourly updates, with river stage and velocity sensors. Elevation of gage is about 8 ft above NAVD 1988, from digital map.
COOPERATION--Massachusetts Department of Conservation and Recreation, Division of Planning and Engineering.

This station managed by the Northborough, MA Field Office.

Available Parameters Available Period
All 5 Available Parameters for this site
00045 Precipitation 2014-05-02  2016-08-31
00055 Stream velocity, MYSTIC VALLEY PARKWAY 2014-05-02  2016-08-31
00060 Discharge [Stage-Q Relationship] 2015-10-01  2016-08-23
00060 Discharge 2007-10-01  2016-08-31
00065 Gage height, MYSTIC VALLEY PARKWAY 2014-05-01  2016-08-31

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Days  (7)

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Instantaneous-data availability statement

Discharge, cubic feet per second

Most recent instantaneous value: 9.7   08-31-2016   10:45 EDT
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Daily discharge, cubic feet per second -- statistics for Aug 31 based on 77 years of record more
Median Most Recent
Value Aug 31
Mean 75th
0.45 1.4 3.8 9.7 10 14 111

Discharge, cubic feet per second, [Stage-Q Relationship]
-- Data temporarily unavailable for the time period specified --

Gage height, feet, MYSTIC VALLEY PARKWAY

Most recent instantaneous value: 6.96   08-31-2016   10:45 EDT
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