While I've seen discussion on the otters being 're-introduced' into the park, I'm curious why stocking some beaver didn't actually precede them?
Most of the otter that I've seen/watched in the wild were in or near beaver ponds.
Additionally, with streams of minimal size and erratic flow, beaver ponds represent the best option to grow bigger fish-WITH more protection for all.
Naturally some flows and gradients will take-out beaver ponds-or they can't even get built- but overal it'd seem both consistent with stated park policy AND good for the fishery. Beaver can even help keep stream banks from being choked off by trash brush.
And beaver don't eat trout:-). Ghost