My suggestions, for what it's worth...

Hood Canal and Strait of Juan de Fuca:

The Elwha. Let's see what it can do...I think the genetics for those wild steelhead have been locked in the "trout" above the dams for a long time, and they are on the loose now

Central and South Puget Sound:

Not sure where the line is for this one, but it's a tough one either way, for a few reasons, not the least of which is that there doesn't seem to be schit left for wild steelhead in any of them anyway. Hard to have a "gene bank" if there aren't any genes.

Maybe the Nisqually is the best bet for this one?

North Puget Sound (North Cascades rivers):

This one's as easy as the Elwha for me...the Skagit/Sauk. The Sauk is already free of plants, and the Skagit is, too...and it has the healthiest run of wild steelhead outside the OP (and maybe including the OP, to be honest) right now.

Thoughts?

Fish on...

Todd