UNITED STATES DEPARTMENT OF THE INTERIOR 



Stewart L. Udall, Secretary 



David S. Black, Under Secretary 



Stanley A. Cain, Assistant Secretary for Fish and Wildlife and Parks 



FISH AND WILDLIFE SERVICE, Clarence F. Pautzke, Commissioner 



Bureau of CoMMEaiciAL Fisheries, H. E. Crowther, Director 



Passage Conditions and Counts of Fish 



at the Snake Island Fishway, 

 Little Falls Dam, Potomac River, Md., 



1960-63 



By 

 PAUL R. NICHOLS 



UNITED STATES FISH AND WILDLIFE SERVICE 

 SPECIAL SCIENTIFIC REPORT--FISHERIES No. 565 



WASHINGTON, D.C. 

 February 1968 



