width of one and one-naif miles, and with a capacity for im- 

 pounding 1,100,000 acre feet of water. This means that the 

 water, if spread out one foot deep, would cover over a million 

 acres, or an area equal to that of the land surface of the 

 whole state of Rhode Island and 700 square miles in Con- 

 necticut in addition. 



For thirty miles helow the dam Salt River flows through 

 a precipitous canyon and this natural waterway will be the 

 outlet for the reservoir. At the mouth of the canyon, and just 

 below the junction of the Verde with Salt River, is a diver- 

 sion dam which turns the -water from its natural course into 

 giant canals to be thence distributed over the valley. By the 

 time the Tonto Dam is completed this diversion dam -will be 

 replaced by a masonry dam, set permanently upon bedrock, to 

 turn the combined flow of these two rivers into a dozen main 

 canals by means of huge headgates on each side of the river. 



It is not expected that the whole supply of the reservoir 



