The underground river is approximately 3 miles long, with about 1.25 miles accessible via boat.
The cavern system is home to the Northern Cavefish (Amblyopsis spelaea), an endangered species adapted to life in total darkness.
The caverns were historically used as a source of water and were once a site for experimental underground mushroom farming.
The cave system was formed by the dissolution of Mississippian-age limestone over millions of years.
The park contains one of the largest sinkholes in the region, acting as a natural drainage point for surface water.
Bluespring Caverns Park features the longest navigable underground river in the United States. The primary attraction is a boat tour through a subterranean river system that winds through large karst limestone passages. Visitors can also participate in gem mining activities at an on-site sluice. The cave maintains a constant year-round temperature of 54 degrees Fahrenheit. The park grounds include hiking trails and picnic areas situated within the Indiana karst landscape. It operates as a privately owned natural attraction focused on cave exploration and geological education.
The cave entrance and the transition zone where natural light fades into the cavern interior.
Bring a light jacket or sweatshirt, as the underground temperature remains consistently cool regardless of the surface weather.
Wear closed-toe shoes with good traction to navigate potentially damp or uneven surfaces at the cave entrance and docking areas.
Book your boat tour in advance online, as capacity for each departure is limited.
Do not attempt to walk into the cave system without a guided tour; all access is strictly regulated for safety and conservation.
Open seasonally from spring through late autumn; closed during winter months.
Do not touch the cave walls or formations, as oils from human skin can damage the delicate mineral structures.
