who is the design of the dam attributed to?
John L. Savage.
Design, preparation and contracting
Officials eventually decided on a massive concrete arch-gravity dam, the design of which was overseen by the Bureau's chief design engineer John L. Savage. 
who was president when the hoover dam was built Franklin D. Roosevelt. where is this dam located? Black Canyon of the Colorado River, on the border between the U.S. states of Nevada and Arizona. did anyone try to find resources on this dam? An initial attempt at diverting the Colorado river for irrigation purposes occurred in the late 1890s, when land speculator William Beatty built the Alamo Canal just north of the Mexican border; the canal dipped into Mexico before running to a desolate area Beatty named the Imperial Valley. how the climate like in this valley? It often has summer temperatures well over , but from late October until mid-April the temperature is relatively mild and can sometimes even reach low temperatures not expected in a desert. is there any fort situated here? Yes, Fort Yuma and who was it built by? UNANSWERABLE
John L. Savage John L. Savage John L. Savage
Hoover Dam Hoover Dam Hoover Dam
Design, preparation and contracting Design, preparation and contracting Design, preparation and contracting
Officials eventually decided on a massive concrete arch-gravity dam, the design of which was overseen by the Bureau's chief design engineer John L. Savage.  Officials eventually decided on a massive concrete arch-gravity dam, the design of which was overseen by the Bureau's chief design engineer John L. Savage Officials eventually decided on a massive concrete arch-gravity dam, the design of which was overseen by the Bureau's chief design engineer John L. Savage.
wiki:7741965
Hoover Dam [SEP] Design, preparation and contracting
Even before Congress approved the Boulder Canyon Project, the Bureau of Reclamation was considering what kind of dam should be used. Officials eventually decided on a massive concrete arch-gravity dam, the design of which was overseen by the Bureau's chief design engineer John L. Savage. The monolithic dam would be thick at the bottom and thin near the top, and would present a convex face towards the water above the dam. The curving arch of the dam would transmit the water's force into the abutments, in this case the rock walls of the canyon. The wedge-shaped dam would be thick at the bottom, narrowing to at the top, leaving room for a highway connecting Nevada and Arizona.