There's no data that support any introgression from Skamania-strain hatchery fish to any summer or winter fish in Washington state rivers. As for the Great Lakes, after having lived there for 28 years I've found that many streams no longer have a hatchery plant yet receive tremendous runs of fish annually due to naturally reproducing populations (primarily in the spring, but some summer runs as well). I'm talking about rivers that are so filled with fish piling up on each other in every piece of holding water you wouldn't believe it. These fish spawn successfully, there is no doubt in the world.