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ICE EFFECTS ON STREAMFLOW During winter, ice formation may cause stage and discharge values to appear higher than expected. Ice effects may be minor (occurring only at night and early morning) with baseline flows obvious, or the effects may be major (stage constantly increases over several days or weeks) resulting in greatly erroneous discharge. Streamgages experiencing minor ice conditions will continue to display stage and discharge values to enable users to estimate the approximate base-line stage and discharge. Streamgages experiencing major ice conditions will have the discharge record temporarily disabled to prevent use of erroneous discharge values. The discharge record will resume when it is determined that ice conditions are no longer present. Daily mean discharges during periods of ice effect will be estimated after detailed data analysis.

USGS 01100500 MERRIMACK RIVER AT LAWRENCE, MA

PROVISIONAL DATA SUBJECT TO REVISION

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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 2012-08-21  2017-06-23

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Gage height, feet

Most recent instantaneous value: 12.24 06-23-2017   14:30 EDT
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