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Map showing the All-American Canal (yellow). The All-American Canal was authorized along with Hoover Dam by the 1928 Boulder Canyon Project Act and built in the 1930s by the United States Bureau of Reclamation and Six Companies, Inc. [4] Its design and construction was supervised by the Bureau's then chief designing engineer, John L. Savage, and was completed in 1942.
The Coachella Canal lining project was completed in 2006, and the All-American Canal lining project finished in 2010, conserving 93,700 acre-feet of water per year. While those conservation numbers are important to the agreement, the total amount of water transferred to the water authorities is set to increase significantly in 2018.
The Boulder Canyon Project Act [24] appropriated $165 million for the project along with the downstream Imperial Dam and All-American Canal, a replacement for Beatty's canal entirely on the U.S. side of the border. [25] It also permitted the compact to go into effect when at least six of the seven states approved it.
The All-American Canal, at lower left, serves California's Imperial Valley. Lees Ferry, Ariz., at center, marks the division between the upper basin states of Wyoming, Utah, Colorado and New ...
The All-American Canal also delivers water from the dam to the Coachella turnout—a section east of Yuma that diverts water to the Coachella Valley Water District. Imperial Dam, located about 20 miles north of Yuma, contains four desilting basins which help remove silt and sediment from the river water so it can be delivered by gravity flow.
The Gila Gravity Main Canal provides water for the Gila Valley in Arizona. The All-American Canal, which runs west to the Imperial Valley of California, is the largest irrigation canal in the world, capable of carrying 26,155 cubic feet per second (740.6 m 3 /s) – the entire natural flow
The project employed 30,000 people over an eight-year period and as many as 10,000 at one time. [ 2 ] The system is composed of two reservoirs, five pumping stations, 62 mi (100 km) of canals, 92 mi (148 km) of tunnels, and 84 mi (135 km) of buried conduit and siphons.
Completed in 1938, the dam retains the waters of the Colorado River into the Imperial Reservoir before desilting and diversion into the All-American Canal and the Gila Project aqueduct. Between 1932 and 1940, the Imperial Irrigation District (IID) relied on the Inter-California Canal and the Imperial Canal and Alamo River.