Tammany Trace Tammany Trace is a 31-mile trail used for walking, biking, horseback riding, rollerblading and jogging. The trail winds through five communities in St. Tammany Parish: Abita Springs, Covington, Lacombe, Mandeville and Slidell. Access: The Mandeville trailhead is located at 21411 Koop Drive, Mandeville LA