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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.


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USGS 01104430 HOBBS BK BELOW CAMBRIDGE RES NR KENDALL GREEN, MA

PROVISIONAL DATA SUBJECT TO REVISION

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LOCATION.--Middlesex County, Hydrologic Unit 01090001, on right bank, 50 ft downstream of culvert at Winter Street, 300 ft downstream of gate house outlet from Cambridge Reservoir, and 1.3 mi north of Kendal Green.
DRAINAGE AREA.--6.86 mi2.
PERIOD OF RECORD.--July 1997 to current year.
GAGE.--Data Collection Platform, water-temperature and specific conductance monitor, air temperature monitor, a heated tipping-bucket precipitation gage equipped with a wind shield, and telephone telemeter. Datum of streamgage is 149.20 ft above NAVD 1988, estimated from topographic map. Datum of reservoir gage is referenced to the City of Cambridge datum. Subtract 10.84 ft to convert to elevation above NGVD 1929. Subract 11.70 ft to convert to elevation above NAVD 1988. Dissolved chloride and sodium concentrations estimated from specific conductance measurements using the regression technique described in Smith 2013.
REMARKS.--Flow affected by regulation of dam 300 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.

Photo of Hobbs Brook Streamflow and Precipitation Gages

Available Parameters Available Period
  
2007-10-01  2021-03-08
2015-09-10  2021-03-08
2007-10-01  2021-03-08
2009-10-23  2021-03-08
1997-10-01  2021-03-08
2007-10-01  2021-03-08
2007-10-01  2021-03-08
2007-10-01  2021-03-08
2015-09-10  2021-03-08
2015-09-10  2021-03-08
2015-09-10  2020-04-06
2015-09-10  2021-03-08
2007-10-01  2021-03-08
2012-05-17  2021-03-08
2009-10-23  2021-03-08







 (7)
 
  -- or --

 

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

Temperature, water, degrees Celsius
Most recent instantaneous value: 4.4 03-08-2021   20:00 EST
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Temperature, water, degrees Celsius, GATE HOUSE
Most recent instantaneous value: 4.2 03-08-2021   19:45 EST
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Temperature, air, degrees Celsius
Most recent instantaneous value: -3.6 03-08-2021   20:00 EST
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Precipitation, total, inches
Most recent instantaneous value: 0.00 03-08-2021   20:00 EST
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Discharge, cubic feet per second
Most recent instantaneous value: 2.40 03-08-2021   20:00 EST
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Daily discharge, cubic feet per second -- statistics for Mar 8 based on 23 water years of record more
Min
(2017)		 25th
percen-
tile		 Median Most Recent
Instantaneous
Value Mar 8		 Mean 75th
percen-
tile		 Max
(2012)
0.09 0.56 1.9 2.40 5 8.6 26.9

Elevation of reservoir water surface above datum, feet, GATE HOUSE
Most recent instantaneous value: 179.78 03-08-2021   19:45 EST
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Gage height, feet
Most recent instantaneous value: 0.44 03-08-2021   20:00 EST
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Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius
Most recent instantaneous value: 1080 03-08-2021   20:00 EST
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Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius, GATE HOUSE
Most recent instantaneous value: 895 03-08-2021   19:45 EST
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Dissolved oxygen, water, unfiltered, milligrams per liter, GATE HOUSE
Most recent instantaneous value: 9.7 03-08-2021   19:45 EST
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Turbidity, water, unfiltered, monochrome near infra-red LED light, 780-900 nm, detection angle 90 +-2.5 degrees, formazin nephelometric units (FNU), GATE HOUSE
Most recent instantaneous value: 3.9 03-08-2021   19:45 EST
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Reservoir storage, million gallons, GATE HOUSE
Most recent instantaneous value: 2246.1 03-08-2021   19:45 EST
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Sodium, water, filtered, estimated by regression equation, milligrams per liter
Most recent instantaneous value: 156 03-08-2021   20:00 EST
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Chloride, water, filtered, estimated by regression equation, milligrams per liter
Most recent instantaneous value: 290 03-08-2021   20:00 EST
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