威斯康辛州愛波頓市狐狸河上的水壩是設置全世界第一座水力發電廠的地點

出處: Detroit Publishing Company. "Dam Across River, Appleton, Wisconsin." Detroit Publishing Company, between 1880 and 1899. Touring Turn-of-the-Century America: Photographs from the Detroit Publishing Company, 1880-1920. American Memory collections, Library of Congress.