Originally known as mill lot #67, comprising 60 acres along the Warner River, Waterloo is a grouping of late 18th- and 19th-century houses and structures that define the former village and its importance to the town of Warner. Its homes are mainly Federal, Colonial, or Victorian in style. The Bean Tavern, circa 1794, stood on the main stage coach route between Boston and Canada. The opening of the Concord and Claremont Railroad in 1849 expanded markets for the mills at Waterloo's Great Falls. Prominent politicians Nehemiah G. Ordway, Governor of the Dakotas, and U.S. Senator William B. Chandler purchased homes there as a base of operations far from the intensity of political life in Washington D.C. The Covered Bridge, circa 1820, designed by Ithiel Town, is one of the few surviving lattice truss bridges in New Hampshire.