About This Route
The Ptarmigan Tunnel Trail, a 12-mile out-and-back or loop from Many Glacier's Ptarmigan Lake trailhead, climbs 2,200 feet to a historic 1930s mining tunnel piercing the continental divide, emerging at Ahern Pass with vistas of Ptarmigan Glacier remnants. Backpackers target Elizabeth Lake or Ptarmigan campsites (permit required), planning 2-3 days amid grizzly habitat. NPS mandates food hangs; sites feature sturdy bars. This rugged route tests endurance on switchbacks and boulder fields, rewarding with remote solitude per Leave No Trace ethics.
Safety Considerations
Cold Ptarmigan Creek crossings risk hypothermia; NPS emphasizes avoiding wet fords, as core temperature drops rapidly below 50°F. Slippery tunnel interior demands headlamps; mossy approaches have caused slips. High grizzly density around Elizabeth Lake; travel in groups of 4+, yell 'Hey Bear' frequently. Avalanche-prone snow chutes linger until late August; consult ranger avalanche forecasts. Steep boulder hops near the pass invite ankle twists; use poles. Thunderstorms amplify rockfall risks.
Essential Gear
Gore-Tex boots (Salomon Quest 4 GTX) for wet crossings, bear-resistant Ursack AllMitey. Therm-a-Rest NeoAir pad for cold ground. Black Diamond Z-Poles, Petzl headlamp. NPS food storage bags for hangs. First aid: SAM splint for sprains, EpiPen for rare allergies.
Emergency Tips
Satellite phone essential; Many Glacier Ranger Station (406-888-7800). Hypothermia: Dry at Elizabeth camp, fire if possible. Bear charge: Spray, group defense. Injury: Splint, inReach evac to Swiftcurrent.