Twenty Mile Trail
Lava Trail System (Hell's Half Acre), Idaho
Added
June 30th, 2026
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About this place
These undeveloped trails offer scenic solitude; there is a short 0.5 mile loop trail and a 4.5 mile trail to the main vent of the Hell's Half Acre flow. Trail routes are marked with poles across lava. A picnic area, fire ring and portable toilets are located at the trail-head. This is treacherous rocky terrain and proper footwear is advised. It also gets very hot and there is little to no shade so proper sun protection and water is advised.
Details
GPS 43.55694, -112.44500
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Nearby places
- Eastern Idaho Visitor Center Tourist Attraction 21 mi
- South Fork of the Snake River - Mike Walker Campground (Paid Public) 21 mi
- Market Lake Wildlife Management Area Wildlife Area 22 mi
- Caribou-Targhee National Forest Christmas Tree Permit Campground (Paid Public) 22 mi
- Mud Lake Wildlife Management Area Wildlife Area 24 mi
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