Twin Arches State Natural Area
🏆🏆🏆🏆🏆 Largest Natural Bridge East of the Rockies — Two massive sandstone arches spanning 100+ feet each
Twin Arches State Natural Area in Scott County is home to the largest natural bridge formation east of the Rocky Mountains — two massive sandstone arches that span over 100 feet each at heights exceeding 50 feet. The North Arch and South Arch are connected by a short trail, and standing beneath either arch is one of the most awe-inspiring experiences in eastern American geology.
The arches were carved from Pennsylvanian-age sandstone by millions of years of weathering, creating spans that rival the natural bridges of Utah in scale if not in the arid desert setting. The surrounding old-growth forest and the Charit Creek Lodge (accessible only by foot or horseback) add to the backcountry wilderness experience.
Visitor Information
| Detail | Information |
|---|---|
| Location | Scott County, TN (Big South Fork area) |
| Entry Fee | Free |
| North Arch | ~62 ft high, 135 ft span |
| South Arch | ~70 ft high, 103 ft span |
| Distinction | Largest natural bridge east of Rockies |
| Trail | ~0.7 mi from trailhead to arches |
Frequently Asked Questions
How do I get to the arches?
A 0.7-mile trail from the Twin Arches trailhead leads to both arches. The trail includes wooden stairs and is moderate in difficulty. Both arches are connected by a short loop. The view from atop the South Arch is spectacular.
Insider Tips
Largest natural arches: Twin Arches is the largest natural bridge complex in the eastern US — the North Arch spans 93 feet and the South Arch spans 70 feet, standing 100+ feet tall. Pro tip: You can walk on top of both arches — the view from the top of the North Arch is breathtaking. Big South Fork: Twin Arches sits within the Big South Fork region — combine with other plateau hikes for a multi-day adventure.
Best Time to Visit
Fall: Foliage through and above the arches. Spring: Wildflowers along the trail. Summer: Green canopy frames the arches. Winter: Bare trees reveal the full arch structure.
Frequently Asked Questions
How were the arches formed?
Water seeping through cracks in the sandstone gradually dissolved and eroded the softer rock beneath — over millions of years, the erosion undercut the harder capstone, creating a natural arch. The process accelerated through freeze-thaw cycles — water expanding as ice wedged the rock apart. Twin Arches is the culmination of millions of years of patient geological sculpting.
🌉 Visit Twin Arches SNA
Largest natural bridge east of the Rockies — two 100+ foot sandstone arches in the Cumberland Plateau.
Wildlife & Nature
Twin Arches SNA — in Big South Fork NRRA — features the largest natural arch in the eastern US. The South Arch spans 135 feet and stands 103 feet high. The North Arch is equally impressive. The trail passes through old-growth forest. Black bears, bobcats, and timber rattlesnakes inhabit the area.
Nearby Attractions
Oneida — nearby. Big South Fork NRRA — surrounding. Pickett CCC Memorial SP — adjacent. Rugby — 15 miles south.
Park Location
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