I sometimes fish a small tributary of one of the big Puget Sound area rivers. The tributary is planted with a handful of winter-run hatchery smolts, but no summer-run smolts. The main river -- the one this tributary feeds into -- receives both winter- and summer-runs. My question is this: is it possible to catch summer-run fish on this tributary? Reason I ask is, I recently ran into a guy on this tributary who'd been having luck with "hatchery summer-runs" -- more than one. Is this possible (probable?), or was the guy confused? How often do steelhead stray from their "home river" and head up a tributary of it? Thanks.