5. Very few coho salmon have appeared at 

 Rock Island Dam in the period 1933-61. The 

 greatest count, 229, occurred in 1947. The 

 1961 count of 50 fish was slightly more than 

 half the 1960 count. 



6. The steelhead count of 7,042 in 1961 ex- 

 ceeded the 28-year mean of 3,063 and was the 

 highest recorded in the period 1933-61. 



7. Fish counting in 1961 began on May 1 

 and terminated October 27. From May 1 to 

 August 19 counting was conducted for 16 

 hours each day; from August 20 to September 

 30, 14 hours each day; and from October 1 to 

 October 27, 8 hours each day. 



8. In 1961 the maximumnumber of salmonids 

 counted in one day (1,651) was on July 14. 



9. Season's total of fish other than salmon 

 and steelhead trout passing Rock Island Dam 

 in 1961 was 140,173, and was composed of the 

 following: sucker, 76,797; squawfish, 15,174; 

 whitefish, 23,124; chub, 6,754; and "other fish," 

 composed largely of lamprey and carp, 18,324. 



10. Of 40,764 fish examined, on the top and 

 one side only, as they passed over the counting 

 boards, approximately 1.06 percent had in- 

 juries of some type either on the body or about 

 the head. Greatest numbers of injured fish oc- 

 curred in July and August. Injuries were most 

 numerous on large chinook and sockeye salm- 

 on. 



11. High water conditions at Rock Island 

 Dam made the fish ladders inoperative from 

 June 9 to 13, inclusive. 



