Bulletin 831, U, S. Dept. of Agriculture. 
Plate IV. 
Fig. I. — Diversion Dam, Washington Power Co., near Spokane, Wash. 
Built at the Little Falls plant in the form of an "~L" to gain crest length 
HpnpiHB JF 
'11 
Fig. 2. — Arched Type Spillway Dam, Pishkun Reservoir, Montana. 
Air intake tower shown in center of picture built to eliminate vibration due to vacuum. 
