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DESCRIPTION:

Latitude 42°22'20",   Longitude 71°14'03"   NAD27

Middlesex County, Massachusetts, Hydrologic Unit 01090001

Drainage area: 251 square miles

Contributing drainage area: 227 square miles,

Datum of gage: 20.02 feet above   NGVD29.

AVAILABLE DATA:

Data Type	Begin Date	End Date	Count
Current / Historical Observations     (availability statement)	1976-02-01	2017-07-21
Daily Data
Discharge, cubic feet per second	1931-08-04	2017-07-20	31398
Daily Statistics
Discharge, cubic feet per second	1931-08-04	2016-10-11	31116
Monthly Statistics
Discharge, cubic feet per second	1931-08	2016-10
Annual Statistics
Discharge, cubic feet per second	1931	2017
Peak streamflow	1932-04-01	2016-04-08	85
Field measurements	1931-06-18	2017-06-08	244
Field/Lab water-quality samples	1952-10-21	2006-07-12	209
Water-Year Summary	2005	2016	12
Additional Data Sources	Begin Date	End Date	Count
Instantaneous-Data Archive  **offsite**	1976-02-01	2007-09-30	526725

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