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
Mohale Dam a rock-fill concrete-face on the upstream side. The volumetric content of the dam structure is 7.5 million m³. The dam has a length of with a wide crest. The spillway, located on the left bank of the dam, is not gated and flood is routed over the crest of the ogee shaped spillway through a concrete lined chute with a flip bucket and a stilling basin at its terminus. The concrete spillway is designed for a flood discharge of per second. The total quantity of concrete contained in the dam is . During the construction phase of the dam, river