Experienced fisherman! What kind of fish does this sound like we caught in a Michigan river?

It was caught in the Galien River (which is in southwest MI and we were about 1/4 mile from mouth of Lake Michigan) and was roughly 7". It was almost pure silver. The main thing I noticed is that it did NOT have a forked tail. I thought maybe a brown trout but it really wasn't brown. I also thought maybe a small steelhead but I've heard they have mostly left the rivers. It was caught w/ a plain 'ol night-crawler. We ruled out bass (it had a fairly small mouth for it's size). It was NOT a carp (compared it to photos and it didn't have weird eyes). Also, it was more of a trout/salmon shape. Any ideas? I wish we had taken a photo! THANKS