Roosevelt Dam

Roosevelt Dam. 1989 – 1996. , After nearly nine years of work, $430 million in construction cost, 450,000 cubic yards of concrete, and 849 miles of reinforcing steel, another vivid chapter in Arizona history has been rewritten. Modifications to Roosevelt Dam were required because it was determined that the largest probable flood that could flow into the reservoir was far greater than originally thought possible when the dam was designed and constructed in the early 1900s., Raising the height of the dam by 77 feet has increased the storage capacity of Roosevelt Lake by 20 percent, for a total of more than 1.8 million acre-feet. An acre-foot is the amount of water it would take to cover an acre of land to a depth of one foot, about 325,851 gallons. This is roughly the amount of water used by a family of four in one year. , Inset: Modified Dam. Type - Concrete Gravity Arch , Arch Height - 357 feet , Top Width - 21.6 feet , Maximum Base Width - 196 feet , Generating Capacity - 36 megawatts , Spillway Capacity - 150,000 cubic feet per second , Lake Capacity - 1,802,202 acre-feet , Lake Surface - 19,199 acres