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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--Middlesex County, Hydrologic Unit 01090001, 10 ft upstream of bridge on River Road, 300 feet downstream of gatehouse outlet from Stony Brook Reservoir, and 2.0 mi southwest of Waltham.
DRAINAGE AREA--23.7 mi2.
PERIOD OF RECORD--October 1999 to current year.
GAGE--Data Collection Platform, reservoir-stage monitor, air temperature monitor, and a heated tipping-bucket precipitation gage equipped with a wind shield. Elevation of gage is 43 ft above sea level (from topographic map). Telephone telemeter at station. Datum of gage is referenced to the City of Cambridge datum, subtract 10.84 feet to elevations to adjust to National Geodetic Vertical Datum of 1929.
REMARKS--Downstream flow affected by regulation of dam 500 ft upstream at outflow of Cambridge Reservoir.
COOPERATION BY--Cambridge Water Department

Daily and unit values precipitation data are calibrated and quality assured prior to publication by the Massachusetts-Rhode Island Water Science Center. Data are available upon request.

Available Parameters Available Period
All 10 Available Parameters for this site
00010 Temperature, water 2008-05-23  2016-10-19
00020 Temperature, air 2007-10-01  2017-09-25
00035 Wind speed 2010-11-30  2017-09-25
00036 Wind direction 2012-10-01  2017-01-27
00045 Precipitation 2007-10-01  2017-09-25
00060 Discharge 1999-08-05  2017-09-25
00062 Elevation, reservoir 2007-10-01  2017-09-25
00065 Gage height 2007-10-01  2017-09-25
00095 Specific cond at 25C 2008-05-23  2016-10-19
72022 Reservoir storage 2007-10-01  2017-09-25

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Instantaneous-data availability statement

Discharge, cubic feet per second

Most recent instantaneous value: 1.30 09-25-2017   14:00 EDT
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Daily discharge, cubic feet per second -- statistics for Sep 25 based on 17 years of record more
Median Most Recent
Value Sep 25
Mean Max
0.03 0.20 0.40 1.30 2.7 7.1 49.8

Gage height, feet

Most recent instantaneous value: 0.77 09-25-2017   14:00 EDT
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