UNITED STATES DEPARTMENT OF THE INTERIOR 



Stewart L. Udall, Secretary 



Frank P. Briggs, Assistant Secretary Jor Fish and Wildlife 



FISH AND WILDLIFE SERVICE, Clarence F. I'autzke, Commisnioner 



Bureau of Commercial Fisheries, Donald L. McKenian, Director 



Salmon Escapements above 

 Rock Island Dam, 1954-60 



by 

 Robert R. French and Roy J. Wahle 



United States Fish and Wildlife Service 

 Special Scientific Report--Fisheries No. 493 



Washington, D.C. 

 March 1965 



