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 feet high and 1250 feet long as its crest, it's one of the ten hydroelectric dams impounding the Deerfield River. Owned and operated by TransCanada Corporation, the facility is an earthen dam with a relatively unusual concrete "morning glory" (freestanding conical drain) spillway, similar to another example at Monticello Dam in California.
The name comes from utility executive Henry I. Harriman, president of the New England Power Company.