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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 01099500 CONCORD R BELOW R MEADOW BROOK, AT LOWELL, MA

PROVISIONAL DATA SUBJECT TO REVISION

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LOCATION--Lat 42° 38’12", long 71° 18’09", Middlesex County, Hydrologic Unit 01070005, on right bank 300 ft downstream from Rogers Street Bridge at Lowell, 0.3 mi downstream from River Meadow Brook, and 0.8 mi upstream from mouth.
DRAINAGE AREA--Total above gage, 400 mi2; net above gage, 307 mi2 — diversion as needed from 92.6 mi2 for use by Boston metropolitan district.
PERIOD OF RECORD--Discharge: October 1936 to current year. October, November 1936 monthly discharge only, published in WSP 1301.
Water-quality records: Water years 1953, 1967–74.
REVISED RECORDS--WDR MA-RI-84-1: drainage area.
GAGE--Data Collection Platform with satellite telemeter. Datum of gage is 67.41 ft above National Geodetic Vertical Datum of 1929.
REMARKS--Low flow regulated by mills upstream. Daily discharge includes undiverted water from 92.6 mi2 in basins of Sudbury River and Lake Cochituate. Prior to December 1961, diversion upstream for use by city of Lowell.
COOPERATION BY--Massachusetts Department of Conservation and Recreation, Office of Water Resources.

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This station managed by the Northborough MA Field Office.

Available Parameters Available Period
All 2 Available Parameters for this site
   
00060 Discharge 1990-10-01  2018-06-22
00065 Gage height 2007-10-01  2018-06-22

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Discharge, cubic feet per second
Most recent instantaneous value: 225 06-22-2018   03:30 EDT
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Daily discharge, cubic feet per second -- statistics for Jun 22 based on 81 years of record more
Min
(2016)		 Most Recent
Instantaneous
Value Jun 22		 25th
percen-
tile		 Median Mean 75th
percen-
tile		 Max
(1998)
69.3 225 226 322 484 573 2730

Gage height, feet
Most recent instantaneous value: 4.51 06-22-2018   03:30 EDT
Graph of Gage height, feet

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