TJ. p. OEOIOOICAL SURVEY 



BtTLLETIX 707 PLATE LXXrV 





^^-*r 



GUNNISON TUNNKL Of^ THE UNITED STATES RECLAMATION SERVICE. 



The driving of a tunnel 6 miles through the solid rock so as to bring some of the mountain 

 water of Gunnison River to irrigate the Uncompahgre Valley is one of the great works 

 accomplished by the Reclamation Service. A, Diversion dam and intake in Black 

 Canyon; B. Interior of tunnel; C, West portal of tlie tunnel. I'holograplis by the 

 U. S. Reclamation Service. 



