JUNE 

 251 '■ 



15 



JULY 



6 

 SEPT 



OLSEN Bar I960 



DOWNSTREAM 



EAST FORK WEIR COUNT BY DAYS 



15 



JULY 



OLSEN BAT 1961 



DOWNSTREAM 



WEST FORK WEIR COUNT BY DAYS 



15 30 



JULY 



15 

 AUG 



15 

 SEPT 



OLSEN BAY 1961 



u 



DOWNSTREAM 



EAST FORK WEIR COUNT BY DAYS 



^EFT JUNE 



15 



JULY 



15 

 AUG 



IS 

 SFPT 



Figure 7. — Daily migration of spawners into East and West Forks, Olsen Creek, 1960-61. 



weir site. Weir gates were opened periodically 

 during daylight hours to allow passage of 

 fish. In 1961 observers tabulated pink salmon 

 by sex, except during high water when visi- 

 bility was poor. 



Even-year cycle (1960) . --Weirs were op- 

 erated in 1960 from June 18 to the first week 

 in September, when high water forced their 

 removal. The migration was virtually com- 

 pleted by that time (fig, 7), Upstream migrants 

 were first counted through the East Fork 

 weir on July 6 and through the West Fork 

 weir on July 2. The total numbers counted 

 for the season were: East Fork weir, 12,392 

 pink and 238 chum salmon; West Fork weir 

 13,565 pink and 272 chum salmon. A few coho 

 salnnon were also counted through the weirs. 



I 10 20 30 10 20 30 10 20 30 



JULY AUG. SEPT. 



WEEKLY TOTAL 



Figure 8. — Weekly pink salmon escapement counts at 

 Olsen Bay weir, 1931, 1953, 1954, 1955. 



Odd-year cycle (1961) . --The weirs were in 

 operation in 1961 from June 25 until the runs 



10 



