Table 6. --Estimation of return of ehinook salmon to the Columbia River 



in 19^7 



(Escapements and Bonneville counts converted to pounds) 



Spring, January 1 - May 31 

 Seg ment of return: Pounds of fish 



Catch below Bonneville Dam in river (l, 032,801) 1,033,000 



Estimated escapement to streams below Bonneville Dam . & 



(15.8 average weight x 67,000 number) 1,059,000±/ 



Bonneville count (12.3 average weight x 133,562 number) 1,6^3,000^ / 



3,735,000 

 Summer, June 1 - July 31 



Catch below Bonneville Dam in river (9^9,9^6) 950,000 



Estimated escapement to streams 



Bonneville count (15.I average weight x 38,860 number) 587,0003 7 



Fall, August 1 - December 31 



1,537,000 



Catch below Bonneville Dam in river (11,877,911) 11,878,000 



Estimated escapement to streams below Bonneville Dam . . 



(21.9 average weight x 81,000 number) 1,77^,0001/ 



Bonneville count (18.6 average weight x 307,955 number) 5,728,0002 / 



19,380,000 



1/ From an average weight of 12,5^5 fish caught below Bonn. Dam May 19^7 • 



2/ From an average weight of kkl fish caught above Bonn. Dam May 19^7 • 



%/ From an average weight of l6l fish caught above Bonn. Dam June, July, 19^7 • 



h/ From an average weight of 17,^5 fish caught below Bonn. Dam Aug., Sept. 19^7" 



2/ From an average weight of 1,997 fish caught above Bonn. Dam Aug., Sept. 19^70 



All average weights from unpublished data collected by Bryant, F. G., 

 former research biologist of the Fish & Wildlife Service. 



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