Give it a bit, gonna be bad for awhile.
Northcoast rivers are notorious for extremely high turbidity levels during the rainy season, due to the local geology. Granted the dam removal in the manner used might not have been optimal and the high turbidity levels may impact the fish for awhile, the fish will likely recover in time. Besides the dams, and their removal, there are other issues the fish will have to deal with, as they have for over a century.
I fully expect there to be spawning runs back up above where the dams existed in just a couple of years.
Interesting in that I haven't seen mention of the effect of all that sediment on the estuary, the mouth of, and the immediate ocean area near the Klamath. Probably be some changes there for a bit too.
