The Keta creek hatchery is actually West of the "new" bridge (It's Whitney bridge FYI).

About a half mile west of Whitney bridge is a road to the north that goes right to the hatchery (212th AVE SE), about a quarter mile, take a right behind behind the fire station, viola' there it is.
They must also have Silvers coming from/to Icy creek and Palmer. The Silvers can be found (At least I and one other guy have found them) much (way!) higher than Keta creek and Whitney bridge...