Harriman Dam

Harriman Dam is a hydroelectric dam in Windham County, Vermont in the town of Whitingham. The water from the dam flows through a penstock to a power generation plant in the adjacent town of Readsboro.

The dam was built in 1923 by the New England Power Company. Some 215 ft high and 1250 ft long as its crest, it is one of ten hydroelectric dams impounding the Deerfield River. It was purchased from the TransCanada Corporation in 2017 by Great River Hydro LLC, which currently operates the facility. It is an earthen dam with a relatively unusual concrete "glory hole" (freestanding conical drain) spillway, similar to another example at Monticello Dam in California.

Harriman Reservoir has a water surface area of 2039 acre, a maximum depth of 180 ft, and a gross storage capacity of 117,300 acre-ft.

The dam and reservoir were named in recognition of utility executive Henry I. Harriman, a former president of the New England Power Company.