S. GEOLOGICAL SURVEY 
BULLETIN 707 
PLATE LXXIV 
TUNNEI 
water of Gunnison River 
gg 
nt erior of tunnel; 
C. 
. OF THE UNITED STATES 
the Red -lamation Serv 
RECLAMATION SERVICE 
The driving of a tunnel 6 miles through the solid rock so as to t wring some of the mountain 
to irrigate the 
Ce a 
Uv. S$ . 
. es Valley is one of the great works 
A, Diversion dam and intake in Black 
C, We ny por rtal of the tunnel, Photographs by the 
