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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 42o22'08", long 71o03'42", Suffolk County, Hydrologic Unit 01090001, at New Charles River Dam, Boston, MA.
DRAINAGE AREA--311 mi2, excludes 23.6 mi2 drained by Stony Brook, from which flow is diverted for municipal supply for Cambridge.
PERIOD OF RECORD--September 2002 to current year.
GAGE--Data Collection Platform with telephone telemeter. Stage sensor for Charles River and Boston Harbor.
DATUM--Datum of gages are from the Massachusetts Metropolitan District Commission base, which is 105.62 ft higher than NGVD 1929.
REMARKS--Charles River stage affected by operation of the New Charles River Dam and Boston Harbor stage affected by tide.
COOPERATION BY--Massachusetts Department of Conservation and Recreation, Division of Planning and Engineering

Photo of Charles River Dam
Photo of Charles River stage sensor location
Photo of Boston Harbor stage sensor location and reference staff gage

Available Parameters Available Period
All 2 Available Parameters for this site
00065 Gage height 2008-10-01  2017-09-26
00067 Tide stage 2008-05-15  2017-09-26

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Instantaneous-data availability statement

Gage height, feet

Most recent instantaneous value: 107.83 09-26-2017   15:00 EDT
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