Grand Coulee Dam started being built 1933 producing power 1941.

On the time line we sort of jumped over the wild CR salmon that were caught by the walls of death in the Columbia to being caught in the ocean as well.

The marine factor is one of the components of where the 2% ESA which is established by the feds which in turn impacts the amount of encounters we can have on some of the CR wild fish.

Ocean caught wild fish still plays a role in what happens in terminal fisheries including the CR. Just because we don't see them being caught doesn't mean it isn't happening.

EDIT: After rereading the 62 page report by the feds,