Regarding ESA listing for Washington coast steelhead. There are two Distinct Population Segments (DPS) for steelhead which is the ESA listing equivalent of ESUs for salmon. The Southwest Washington DPS covers Grays Harbor tribs south through the lower Columbia below the Cowlitz. The Olympic Peninsula DPS covers trib populations north of Grays Harbor. A petition for listing would cover the status of the populations as a group in each of these DPSs. Trends in abundance and habitat conditions for the group come into play on listing decisions. Individual populations within a group dont all have to be in the toilet for listing. The expectation of the group's future is what makes up for a listing.