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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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LOCATION--Lat 42°42’17.4", long 71°09’11.3", Essex County, Hydrologic Unit 01070002, on left bank, 50 ft downstream from Union Street (Duck Bridge) at Lawrence, MA.
DRAINAGE AREA--Total above gage, 4,672 mi2 of which 214 mi2 is probably non-contributing.
PERIOD OF RECORD-- August 2012 to current year.
GAGE--Water-stage recorder with satellite telemeter. Elevation of gage is set to North Americian Vertical Datum (NAVD88), from levels survey.
COOPERATION BY--Massachusetts Department of Conservation and Recreation, Office or Water Resources.
REMARKS--Stage-only data are available.
KEY FLOOD ELEVATIONS--Top of concrete retaining wall below Duck Bridge, 16.74 ft, NAVD88.

This station managed by the Northborough MA Field Office.

Available Parameters Available Period
All 1 Available Parameters for this site
00065 Gage height 2012-08-22  2019-07-22

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Gage height, feet

Most recent instantaneous value: 9.12 07-22-2019   19:30 EDT
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