The problem with PS Springs is that they were/are taken in the black mouth fisheries. PS Springs have been depressed/overhatvested since at least the 70s and a big reason was that fishery. They weren't enough of them, in total, to justify closing the fishery as they made up a teeny, tiny fraction of the catch. It was just most of the run.

It was an oddity, (seemed odd to me) that the tags put in Elwha, Dungeness, White, and Skagit "Springs/early returns) showed up staying around more than Falls. But, they did.