native or not?
Are you refering to the Great Lakes trib's, or to inland streams in the midwest?
If you meant the trib's, then there are no native species other than Lake Trout & Brook Trout,(both actually char). The lakers spawn on reefs out in the lakes; the brookies on reefs & also in the streams.
If you refer to streams NOT tributary to the GL's, then the only native species would have been the brook trout. Rainbows & Browns are imports. They obviously survive & reproduce, but IMHO, they would have to be considered feral, not native.
Be responsible;have all your steelhead speyed