Come raft with us on the Chattahoochee River through Columbus, Ga., and Phenix City, Ala. – the longest urban whitewater rafting in the world! USA Today picked the Chattahoochee Whitewater Park as one of the Top 12 man-made Adventures in the World! This course consists of class III-V whitewater at high water. It is one of the most exciting whitewater-rafting rivers in the U.S. The rapids are the largest south of Canada and east of the Colorado.