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The Nashua River, 37.5 miles (60.4 km) long, is a tributary of the Merrimack River in Massachusetts and New Hampshire in the United States. It is formed in eastern Worcester County, Massachusetts , at the confluence of the North Nashua River and South Nashua River , and flows generally north-northeast past Groton to join the Merrimack at Nashua ...
- 37.5 mi (60.4 km)
Nashua, Squannacook & Nissitissit Rivers. Massachusetts, New Hampshire. Located in north-central Massachusetts and southeastern New Hampshire, the Nashua River watershed covers 538 square miles, includes 32 communities, and supplies drinking water to over two million people.
The Nashua River watershed can be divided into four major aggregate subwatersheds: North Nashua River, Wachusett Reservoir, Nashua River mainstem, and the Squannacook and Nissitissit Rivers watersheds. The North Nashua begins at the confluence of the Whitman River and Flag Brook in west Fitchburg.
Monitoring location 01096500 is associated with a Stream in Middlesex County, Massachusetts. Current conditions of Discharge and Gage height are available. Water data back to 1935 are available online.
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The Nashua River Watershed Association is pleased to share our 2022 Water Report. This new report analyzes the results of our 2022 water monitoring season covering topics such as: what do we study and why? what do the results tell us about the health of our waterways? what sections of rivers or streams are facing water quality challenges?
The Nashua River. Explore Your Rivers Home Page. South Nashua River (outfall from the Wachusett Reservoir; the Nashua River mainstem begins at the confluence of the North and South Nashua Rivers in Lancaster) Stillwater River (The Quinapoxet and Stillwater Rivers flow into the Wachusett Reservoir) MA Towns in the Nashua River Watershed: Ashburnham.
Learn More. The Nashua River valley was carved by moving glacial ice that was over one mile deep. The Nashua River itself was once Glacial Lake Nashua, an enormous lake that extended from Boylston, Massachusetts north to Nashua, New Hampshire, and flowed southward through the Worcester area.
