Onondaga Creek: Syracuse's River des Peres. In St. Louis, the River des Peres is utterly channelized as it flows through the city, and so is Onondaga Creek. And both become channels for an overflow mixture of sewage backup and street run-off when it rains a lot. Poor planning, and now extremely expensive to remedy.
How clear it is flowing right now! We have run the creek in our canoe, and participated in the annual creek cleanup. You would not believe how much stuff ends up in the creek...bikes, teevees, baby strollers, tires, pipe, wallets.