Horse watering trough, Gatlinburg, TennesseeGreat Smoky Mountains National ParkWork Order No. R-18 GRSM. Completion report photo. Horse watering trough made from scrap material by a related project.Two-Mile Branch Horse Concession; Roads, parking area, and trails, II-HC-2Mi-7232, Physical Facilities - Horse Concession Facilities - Two Mile Branch Stables