372 



FORESTRY AND IRRIGATION 



August 



or even of several tons of the black 

 shale carrying the shells might be pre- 

 cipitated upon the workmen. It was 

 therefore necessary to support the 

 roof of the tunnel with timber for 

 every foot of advance in order to pro- 

 tect the workmen from injury or 

 death. 



It is curious that these shells de- 

 posited in the ocean millions of years 



interest by engineers throughout the 

 country by reason of the fact that it 

 is the longest and largest underground 

 waterway of its kind in the world. Its 

 total length will be 30,000 feet, its 

 cross section 10^ by 11^2 feet, and its 

 capacity 13,000 cubic feet per second. 

 It is to be cement lined throughout 

 and completed in 1908 at an approxi- 

 mate cost of $2,000,000. For the 



Dam Site in the Grand Canyon of the 

 Gunnison River, Colorado 



ago are now being brought to light 

 and are endangering the lives of 

 creatures hundreds of centuries 

 younger than they. 



Each one of the shells at one time 

 held a living organism, whose bulk 

 would be sufficient to make a meal for 

 a dozen men. 



The work on the Gunnison tunnel 

 is being watched with a great deal of 



greater part of its length the tunnel 

 is in solid granite, in some places 

 2,000 feet below the surface of Vernal 

 Mesa. 



This tunnel will carry water from 

 Gunnison Canyon over into the valley 

 of the Uncompahgre River where it 

 will be used to irrigate about 150,000 

 acres of fine agricultural land. 



