| Grand Coulee Dam | Hoover Dam | |
| Type of Dam | Gravity Dam | Gravity-Arch Dam |
| Operating Agency | Bureau of Reclamation | Bureau of Reclamation |
| Total Generating Capacity | 6,809 megawatts | 2,080 megawatts |
| Location | Washington State | Nevada/Arizona |
| Dates of Construction | 1933-1941 1967-1974 Third Powerplant |
1931-1936 |
| Height of Dam | 550 feet | 726 feet |
| Length of Dam | 5,223 feet | 1,244 feet |
| Concrete | 11,975,521 cubic yards* | 3,250,000 cubic yards |
| Purposes and Benefits | Purposes and benefits of both dams include flood control and river regulation, water storage and delivery (including irrigation), power generation, recreation and fish and wildlife. | |
*With 12 million cubic yards of concrete you could build a sidewalk four feet wide and four inches thick and wrap it twice around the equator (50,000 miles), or you could build a highway from Seattle, Washington to Miami, Florida.
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