Type
Cave
Location
41.7130°N 121.5109°W
Thunderbolt is a lava tube on Cave Loop Road, rated among the most challenging because of its tight spots. It draws cavers willing to squeeze through narrow passages.
Details
- Type
- Cave
- Accessibility
- Limited accessibility
Inside the cave
Thunderbolt runs about 2,561 feet. Some squeezes narrow to roughly 6 inches, and stooping is needed through other sections. A helmet and at least three light sources are required, and a free permit with white-nose syndrome screening comes from the visitor center. The cave has been closed at times for bat protection, so confirm it is open before going in.