10. CeliloFalls, Oregon/Washington, United States – 5,800 feet wide.
Also known as the Horseshoe Falls, this waterfall was located on the Columbia River between the border of Oregon and Washington State, east of the Cascade Mountains. The site was a popular native fishery for many years until it was sadly submerged by the Dallas Dam created in 1957. This Dam was created by the Army Corps of Engineers to improve irrigation, prevent flooding and provide electricity for the World War II defense industry.
