Elevation: 6,559 ft
GPS: 46.265, -114.307 Google Map · Climbing Area Map
Page Views: 1,050 total · 121/month
Shared By: Steph Abegg on Sep 3, 2018
Admins: grk10vq, Zach Wahrer
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Description

Horsehead Arch is a ~160-foot tall granite arch high on south side of Blodgett Canyon. The arch can be seen from trail just before the main trail crosses the creek at a bridge.

Geology lesson: I have a friend who was a geology professor for over 30 years. I asked him how an arch like Horsehead Arch formed. Here was his response: "How it formed....arches in granitic rock usually form by a favorable set of joints that allow progressive collapse of blocks once an opening occurs below while maintaining enough rock to be self- supporting. Obviously arches eventually collapse, and one that has evolved to the thinness and apparent delicacy of Horsehead is doomed, perhaps a week from next Tuesday! The final cause of failure will most likely be a bit more ice wedging in cracks, or less likely, an earthquake, which do occur in Montana (1959, near Yellowstone, magnitude 7.1). Or maybe two really stout climbers."

Getting There

Hike about 3 miles up the Blodgett Canyon trail. Leave the trail just before it crosses to the north side of the creek. Traverse to the large boulder/talus field and ascend about 1800 vertical feet up talus and hillside to the arch. It took us about 3 hours from the trailhead to the base of the arch.

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