For those who don’t believe it, I strongly recommend that everyone take the Shoreline Sightseeing 75-minute Architecture Tour, starting at Michigan Ave., just downriver from the Apple Store. It takes you a little up the North branch of the river, and more along the South branch.
The tour’s route overlaps the swam route, so you’ll be able to see the river’s cleanliness yourself. When I took the tour in May, the river was great! I’m really happy to see it so clean.