Kayakers paddle through the urban jungle.
Water taxis rush commuters across town.
Congestion is making the river seem like a watery version of O'Hare International Airport at rush hour. The Coast Guard says the once-forsaken river is now among the busiest in the nation. Nearly every tug, barge and tour-boat captain is grumbling about the swell of recreational users that they say is compromising safety. But it's only 'Pirates of the Caribbean' until someone gets hit by a barge.