Comerford Reservoir is a 1,029-acre (4 km2) impoundment located on the Connecticut River on the boundary between Vermont and New Hampshire in the United States. The reservoir is formed by the Frank D. Comerford Dam in the towns of Monroe, New Hampshire, and Barnet, Vermont, and impounds water into the towns of Littleton, New Hampshire, and Waterford, Vermont, nearly to the Moore Reservoir upstream on the Connecticut.