Since commercial fishing and development of the Pac. NW began, anthropogenic effects have greatly impacted native salmon.
Columbia River salmon pops are at < 3% of historic levels, which once were as high as 16,000,000 fish/year
Specific causes of poor pops are oft debated and occasionally agreed upon
The overall objective of this project is to evaluate the impact of supplementation on Yak. Sp Chinook
Specifically we tested the hypothesis that spawning distribution is different for hatchey vs wild-origin Chinook
And, we collected habitat data to explain the distribution that exists.


About 5500 chinook passed Roza in 2008, compared with 3000 in 2007