Dams
on the Connecticut River
Dams large and small impound much of the upper river. Added together, the impoundments make up the second largest lake in New Hampshire. Here is a list of the 13 intact and 2 breached dams on the upper river's mainstem, from north to south. Those marked with an asterisk produce hydroelectricity.

Dam
Town
Height

Moose Falls Flowage

Pittsburg

10'

Second CT Lake Dam

Pittsburg

28'

First CT Lake Dam

Pittsburg

56'

Murphy Dam, Lake Francis

Pittsburg

106

Canaan Dam*

Canaan/ Stewartstown

27'

Lyman Falls Dam

Bloomfield/Columbia

(breached)

Wyoming Dam

Guildhall/Northumberland

(breached)

Gilman Dam*

Lunenburg/Dalton

40'

Moore Dam*

Waterford/Littleton

178'

Comerford Dam* (pictured)

Barnet/Monroe

170'

McIndoe Falls Dam*

Barnet/Monroe

25'

Dodge Falls Dam*

Ryegate/Bath

28'

Wilder Dam*

Hartford/Lebanon

39'

Bellows Falls Dam*

Rockingham/Walpole

57'

Vernon Dam*

Vernon/Hinsdale

60'

Click here to visit the Connecticut River Coordinator's web site and animated map of the increase in dams since 1850.

Flood Control Dams

The U.S. Army Corps of Engineers maintains a series of flood control dams on several of the river's major tributaries in NH and VT. Construction of these dams was authorized by Congress in 1936 to protect downstream cities in the river's floodplain, following a major flood in that year.

Flows at
Mainstem Dams

TransCanada, which currently owns and operates the major mainstem hydro dams on the upper river, provides information on current and projected flows at these dams.