I dont think hatchery spring chinook get to go farther than river-mill-dam but i think, after the hatchery gets thier 1% of fish they may send a few up river but i dont know for sure because i believe a few years ago they made the upper clak a wild & senic river and i have also seen alot of wild spring chinook in the upper narrow river (when fly-fishing for trout) but i did not want to fish for them because i knew they were wild fish.