136 



SMITHSONIAN INSTITUTION 



Fig. 160. — The canyon of the Snake River in Idaho. South of Levviston the 

 gorge reaches a depth of nearly one mile. 



•'Wg! 



Fig. 161. — The falls and rapids of the Deschutes River near its confluence 

 with the Columbia where, according to early accounts, was the greatest 

 native trading center in the Columbia Valley. 



