ILLUSTRATIONS 



Figure Page 



1. Columbia River System 1 



2. Tucannon and Asotin River Systems. • . • • • 3 



S» Clearwater, Salmon, and Tfeiser River Systems ..... 18 



4* Power dam near the mouth of the Clearwater River ... 20 



5* Grande Ronde River System ......32 



6. Lower seotion of the Grende Ronde River 35 



7. A section of the upper Grande Ronde River 38 



8. FiBhway and diversion dam for the City of Union. ... 48 



9» A wire-covered rock irrigation diversion dam on 



Catherine Creek. ................... 50 



