The new publication of the National Park Service titled Essential Guide to Paddling the Parks features the 18 water trails currently designated into the National Water Trails System.
Click on the link below and go to page 50 to review the list of national water trails, including the Rock River National Water Trail.
The Rock River is the third longest national water trail behind the Alabama River and Puget Sound.
— per Greg Farnam
Read the online version here: http://issuu.com/krepanshek/docs/npt_paddling2015_online
See page 50 for the highlight on National Water Trails