What sort of protection do you think resident rainbows need that they would not get with the steelhread listing? There would be no difference in anadromous waters, and in resident waters above barriers they seem to be in pretty good shape where they occur - largely in forested basins with HCP coverage and reasonable harvest policies. Ocean conditions and gillnets are not an issue for those fish/ The data I've seen don't suggest any problems with isolated resident populations. So what would be the point?