Nearly all St. Jo. trails are now represented on mtbproject.com. Maps and information are downloadable and printable. Standalone GPX files are even available.
The "River Trail System" featured ride is a developing group of trails that comprises the Upper and Lower River Bluffs Trails, the Comeback Trail, and the Exposure Spur AKA "Little Moab." Access to these trails is through Sunbridge Hills Conservation Area. Sunbridge will remain on it's own as development unfolds. Eventually, those will have their own "featured ride" to encompass all those trails within the CA.
Sunbridge and the Comeback are both in need of some TLC. The areas south of Sunbridge are a maze of old ATV trails. If you choose to explore, a knowledgeable local or accessible maps are a must. Some are used in the current routes which adds to confusion.
****************** I recently checked these links on my IPhone and got the mobile description. FOR THE MAPS, if this happens, go to the bottom of the page and click the "full website" link.*******************
The Lower Four:
Girl Scout and Brownie
http://www.mtbproject.com/trail/7002469 ... cout-trail
Overlooking the River:
Sunbridge Conservation Area
http://www.mtbproject.com/trail/7008751 ... ation-area
The River Trail System (River Bluffs Park)
http://www.mtbproject.com/trail/7009009 ... ail-system
http://www.mtbproject.com/trail/7008997 ... ver-bluffs
http://www.mtbproject.com/trail/7008998 ... l-two-expo
http://www.mtbproject.com/trail/7009000 ... ver-bluffs
http://www.mtbproject.com/trail/7008773 ... back-trail