Table 2. — Spawning ground surveys above Bocky Reach Dam site 1956-57. 

 Peak counts (live and dead) of chinook and blueback salmon 



Species and 

 name of stream 



Salmon counts 



1956 



1957 



Period of peak 

 of spawning 



CHINOOK SALMON 



Entiat River 



Twisp River 



Chewack River 



Nfethow River 



Above Winthrop 



Winthrop to Twisp 



Twisp to Pateros 



Simllkameen River 



Okanogan River 



Oroville to Brewster ■"" 



BLUEBACK SAIM)N 



Okanogan River 



Above Lake Osoyoos 



149 

 191 

 404 



249 

 141 

 375 

 101 



99 



16,067 



273 



702 



1,065 



909 



148 



1,398 



189 



Aug. 20-30 

 Aug. 10-20 

 Aug. 15-25 



Aug. 

 Sept 

 Oct. 

 Oct. 



20-30 



. 5-15 



5-15 



10-20 



8,533 



Oct. 15-25 



Oct. 1-10 



During aerial surveys of this section following the peak of spawning, 37 salmon 

 redds were counted in 1956 and 53 redds in 1957. 

 ^Survey too early for spawning peak. 



3 mites 

 (widths eiagQeroled ) 

 o Spnnq Chinook 

 • Summer Chinook 



Figure 5. — Areas of spavming in the Entiat River, 



ment at Rock Island Dam shows the 

 separation of spring and summer Chi- 

 nook runs to occur sometime between 

 June 25 and July 9. Accordingly, tag 

 recoveries were plotted by these 

 periods in which spring and summer 

 Chinook are known to have passed the 

 dajxi, figure 8. The period between June 

 25 and July 9 was chosen as a period 

 of overlap of the two runs. It is ob- 

 served that for the combined tagging 

 data of 1954 and 1955 no tagged spring 

 Chinook were recovered on the summer 

 Chinook spawning areas; only one tagged 

 sumimer chinook was noted in spring 

 Chinook spawning areas. Fish tagged 

 during the period of overlapwere found 

 in both areas. 



The 1956 tagging experiments at 

 Rock Island Dcm:i indicate that spring 

 chinook may not always pass Rock 

 Island Dami and Rocky Reach Dcm^i site 

 in the periods indicated. The distribu- 

 tion of tagged fish by season of passage 

 at Rock Island for 1956 is showninfig- 

 ure 9. Many fish tagged after Jvily 9, 1956 



