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ICE EFFECTS ON STREAMFLOW

The formation of ice on rivers can cause discharge values to appear unusually high. Display of these erroneous discharge data may result in improper assessment of flow conditions and misuse of the data. For this reason, display of discharge values for streams significantly affected by ice may be disabled from view. Display of discharge data will resume when ice conditions are no longer present. Discharge values for streams minimally affected by ice will continue to be displayed. Flows for streams with these conditions appear to increase during the night and decrease to near-base-line conditions around midday. To estimate the correct discharge for these streams, use the flow rate that corresponds to the bottom of the discharge curve, rather than the peak that corresponds to the top of the curve. Note that this method of estimation is possible only when no surface runoff is occurring. Daily mean discharges for periods of both significant and minimal ice-effect will be estimated and published in the Annual Water-Data Report for the water year in which they occurred.



USGS 01104460 STONY BROOK AT RT 20 AT WALTHAM, MA

PROVISIONAL DATA SUBJECT TO REVISION

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LOCATION--Lat 42o22'08", long 71o16'16", Middlesex County, Hydrologic Unit 01090001, 200 ft downstream of State Highway 20, 1,000 ft upstream from Stony Brook Reservoir, and 1.8 mi west of Waltham.
DRAINAGE AREA--22.0 mi2.
PERIOD OF RECORD--October 1997 to September 1998; August 2002 to current year.
GAGE--Data Collection Platform, water-temperature, specific conductance, pH, and turbidity water-quality monitor. Elevation of gage is 90 ft above sea level (from topographic map). Telephone telemeter at station.
REMARKS--Flow affected by regulation of dam 2.6 mi upstream on Hobbs Brook at outflow of Cambridge Reservoir.
COOPERATION BY--Cambridge Water Department

Available Parameters Available Period
All 5 Available Parameters for this site
  
00010 Temperature, water 2007-10-01  2018-05-20
00060 Discharge [(2)] 2007-10-01  2018-05-20
00065 Gage height 2007-10-01  2018-05-20
00095 Specific cond at 25C 2007-10-01  2018-05-20
99404 Chloride, wf, estim 2009-10-28  2018-05-20

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


Discharge, cubic feet per second, [(2)]

Most recent instantaneous value: 55.1 05-20-2018   09:00 EDT
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Daily discharge, cubic feet per second -- statistics for May 20 based on 16 years of record more
Min
(2016)
25th
percen-
tile
Median Mean 75th
percen-
tile
Most Recent
Instantaneous
Value May 20
Max
(2007)
12.2 16 28 47 55 55.1 172


Gage height, feet

Most recent instantaneous value: 5.80 05-20-2018   09:00 EDT
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