- Imperial Dam and All-American Canal Project - CAImperial Dam was built by the Bureau of Reclamation during the New Deal as a feature of the Boulder Canyon Project, along with Hoover Dam and Parker Dam, on the lower Colorado River. It lies 17 miles above Yuma, Arizona. It is the diversion structure for the All-American Canal, which serves the Imperial Valley and Coachella Valley in Southern California and for the Gila Project in Arizona. The dam is 3500 feet along the crest and 41 feet high at overflow point. The All American Canal headworks has a maximum diversion capacity of 15,000 cfs. The length of the All American canal – so-named because it did not...