there are quite a few rivers in the regs which receive no plant(at least officially) that allow for hatchery steelhead retention. however most of them are also catch and release for everything else, so my logic says that WDFW just doesn't want any hatchery fish in those places, should you come across any.

the really weird ones are a couple of nisqually tributaries, though there are no plans in that system that i know of.