Owyhee Dam A project of the Bureau of Reclamation, they hired General Construction Company from Seattle to build the dam. Former Oregonian and then United States President Herbert Hoover dedicated what was the highest dam of its type in the world on July 17, 1932. Secretary of the Interior Ray Lyman Wilbur delivered Hoover's message at the dam. Owyhee's construction served as a prototype for the larger Hoover Dam on the Colorado River, including the use of refrigeration to cool the concrete. The dam cost $6,000,000, with the total reclamation project costing $18,000,000. Owyhee was designed by Frank A. Banks, who also
Bemposta Dam Bemposta Dam Bemposta Dam () is a concrete arch dam on the Douro, where the river forms the national border line between Spain and Portugal. It is located in the municipality Mogadouro, in Bragança District, Portugal. Construction of the dam began in 1957. The dam was completed in 1964. It is owned by "Companhia Portuguesa de Produção de Electricidade" (CPPE). Bemposta Dam is an (height above foundation) and arch dam with a crest altitude of 408 m. The volume of the dam is 316,000 m³. The dam contains four crest spillways (maximum discharge 11,500 m³/s) and one bottom outlet (maximum