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Mill River (Connecticut)

From Wikipedia, the free encyclopedia

The Mill River is a river in New Haven County, Connecticut.[1]

Mill River, Hamden, Connecticut. Sleeping Giant Mountain in background.
Mill River, Hamden, Connecticut. Sleeping Giant Mountain in background.
Map showing the Mill River and other rivers draining to New Haven Harbor, with their combined watersheds.
Map showing the Mill River and other rivers draining to New Haven Harbor, with their combined watersheds.


A mill for grinding corn was built on a Quinnipiack ford near East Rock in 1642. By 1780 there were eight mills. In time the river provided power for Eli Whitney's gun factory, now the Eli Whitney Museum.

Watershed and course

The river starts in the town of Cheshire, flows through Hamden and New Haven, and discharges into New Haven Harbor on Long Island Sound. The river's length is 17.4 miles (28.0 km).[2] The river is dammed in southern Hamden to form Lake Whitney, which is operated as a reservoir by the South Central Connecticut Regional Water Authority.

Mill River passes through Sleeping Giant State Park in northern Hamden and East Rock Park below Lake Whitney in Hamden. These are among the river's reaches that remain undeveloped and are popular spots for fishing and hiking.

The USGS has maintained a gauge (01196620) near Sleeping Giant for the past 41 year to continuously monitor flow. Real time data are available here.

A trail is under development that follows the course of the river, especially in the city of New Haven.

The lower portion of the river is a fresh tidal system because of the existence of tide gates that cyclically block flow near State Street in New Haven. This section of the river is the subject of research to determine how sediments, metals, and other substances cycle through the estuary.

The Mill River tide gates near State St, New Haven, at slack tide.
The Mill River tide gates near State St, New Haven, at slack tide.

English Station, an abandoned power plant, lies on Ball Island in the New Haven terminus of the river. There has been a study of PAHs in this section of the river.

Ecology and conservation

In 2018 a plan for protecting and restoring the Mill River Watershed was developed through collaboration between Save the Sound and Connecticut DEEP.[3]

The river and its watershed are stewarded by a volunteer group, the Mill River Watershed Association.

See also


  1. ^ Mill River Basin: 01196620 Mill River near Hamden, page 168 in U.S. Geological Survey Water Resources Data, Connecticut, Water Year 2005
  2. ^ U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National Map Archived 2012-04-05 at WebCite, accessed April 1, 2011
  3. ^ "Mill River Watershed Management Plan".

Further reading

  • 1998. The Streets of New Haven - The Origin of Their Names, (2nd ed.) ISBN 0-943143-02-0

This page was last edited on 12 October 2021, at 07:55
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