This Act authorized the construction of Hoover Dam and Power Plant and the All-American Canal. In addition, the Lower Basin States made provision for the sharing of water, and authorization was given to the Secretary of the Interior (Secretary) to execute contracts for water made available by the Boulder Canyon Project, subject to the terms of the Colorado River Compact.
The provisions of the Act stipulated that it would take effect upon the fulfillment of either of two conditions. The first provision required that all seven states ratify the Colorado River Compact. Because Arizona was not satisfied with the terms of the Compact, it became impossible to meet this condition. In fact, Arizona did not ratify the Colorado River Compact until 1944. The second condition required that six of the states, including California, ratify the Compact, and that California agree to limit its consumptive use of water from the Colorado River to 4.4 million acre-feet. With the exception of Arizona, all of the Colorado River Basin States ratified the Compact, and passage of The California Limitation Act of 1929 completed the conditions required to make the Act effective. President Herbert Hoover declared the Boulder Canyon Project Act and the Colorado River Compact in effect on June 25, 1929.
The Act also authorized the states of Arizona, California and Nevada to enter into an agreement whereby the 7.5 million acre-feet of water that was apportioned to the Lower Basin by Article 111(a) of the Colorado River Compact would be apportioned as follows: to California, 4.4 million acre-feet per annum; to Arizona, 2.8 million acre-feet per annum; and to Nevada, 0.3 million acre-feet per annum. The three states, however, were unable to agree on such an apportionment: 1928 Boulder Canyon Project Act