Back in the '70s, when there was a boat rental & motel there on the lake (might be where the campground/boat launch is today), my dad and I would spend most of a week there. Crappie, perch, & bass were what we caught, but there were definitely trout, steelhead, and salmon going in there.
At the bridge over the river, by the campground, we watched a hawk swoop down and pluck a big fish out of the water. And then repeat the feat an hour later, all the while we were getting skunked.