410 



THE NATIONAL GEOGRAPHIC MAGAZINE 



BUILDING THE HIGHEST MASONRY DAM IN THE WORLD : SHOSHONE DAM, WYOMING 



The dam will be of concrete gravity type, 328.4 feet from bed-rock to top of parapet walls ; 

 85 feet long on the bottom ; 200 feet long on the top ; 108 feet thick on the bottom. It will 

 create a reservoir covering 6,600 acres, with a capacity of 456,000 acre-feet. Water will be used 

 to irrigate about 150,000 acres of land lying 75 miles east of the Yellowstone National Park 

 (see page 411). 



