The Adirondack Trail Improvement Society currently maintains 105 miles of public hiking trails in the vicinity of Keene Valley and St. Huberts. The trails maintained stretch from Rooster Comb just south of Keene Valley to the Elk Lake-Marcy Trail which crosses the headwaters of the Ausable River on its route to Marcy. Summits reached by ATIS-maintained trails include Giant, Rocky Peak, Noonmark, Dial, Nippletop, Colvin, Blake, Haystack, Gothics, Sawteeth, and Lower Wolf Jaw.
Maintenance is performed by a professional crew of generally six members who work from mid-May to early August. Work begins in May with a patrol of the system to remove winter blowdown, clean existing drainage structures, and assess any additional damage to be repaired later. Following this patrol, the crew works on selected trails to add drainage, build rock staircases, bog bridges, and generally "harden" the trails to better withstand today's levels of hiker traffic. The crew is also responsible for maintaining and, if necessary, rebuilding the 20 bridges and 24 ladders along the trail system.