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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 01172010 CONNECTICUT R AT I-391 BRIDGE AT HOLYOKE, MA

PROVISIONAL DATA SUBJECT TO REVISION

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LOCATION

LOCATION--Lat 42o11'26", long 72o36'32", Hampden County, Hydrologic Unit 01080201, on right bank, 300 ft upstream from the Interstate 391 bridge behind the flood barrier near water access through wall at flood barrier mile 85.
DRAINAGE AREA--8,332 mi2.
PERIOD OF RECORD--October 2002 to current year.
GAGE--Data Collection Platform with satellite and telephone telemeters at station.
REMARKS--Flow regulated by power plants, by First Connecticut and Second Connecticut Lakes, Lake Francis, Moore, and Comerford Reservoir, and other reservoirs, combined usable capacity, about 47 billion cubic feet.
COOPERATION--Holyoke Gas and Electric Co.

Photo of Connecticut River at gage location

Boating safety tips
This station managed by the East Hartford CT Field Office.

Available Parameters Available Period
All 2 Available Parameters for this site
  
00060 Discharge 2002-11-02  2018-02-20
00065 Gage height 2007-10-01  2018-02-20

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


Discharge, cubic feet per second

Most recent instantaneous value: 20000 02-20-2018   06:30 EST
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Daily discharge, cubic feet per second -- statistics for Feb 20 based on 14 years of record more
Min
(2003)
25th
percen-
tile
Median Mean 75th
percen-
tile
Most Recent
Instantaneous
Value Feb 20
Max
(2008)
7760 8320 9150 13600 14100 20000 47600


Gage height, feet

Most recent instantaneous value: 10.81 02-20-2018   06:30 EST
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