The park's archaeological site, the Raddatz Rockshelter, is listed on the National Register of Historic Places.
Excavations revealed thousands of artifacts including bone tools, shells, and remnants of extinct fauna.
The sandstone formation is part of the Cambrian-age rock layer, dating back over 500 million years.
The bridge is situated in an area of the driftless region, which escaped glaciation during the last ice age.
Natural Bridge State Park features the largest natural sandstone arch in Wisconsin, which spans 35 feet and rises 25 feet high. The site is historically significant for the Sheltered Rockshelter, located directly beneath the arch. Archaeological excavations discovered evidence of human occupation dating back approximately 11,000 years, including projectile points and fire pits. The park encompasses 530 acres of rugged terrain, featuring a mix of dry prairie, oak woods, and sandstone bluffs. A designated 1.25-mile hiking trail leads visitors from the parking area to the base of the natural bridge. Geologically, the bridge was formed through the erosion of weaker sandstone layers by wind and water over millennia. The area is managed by the Wisconsin Department of Natural Resources as a state natural area.
The view from the base of the arch looking upward through the opening.
Wear sturdy hiking boots, as the trail to the arch can be uneven and rocky.
Bring insect repellent during the summer months, as the wooded areas are prone to mosquitoes and ticks.
Pack a light day pack with water, as there are no potable water sources available at the trailhead.
Attempting to climb on top of the bridge, which is illegal and dangerous due to sandstone instability.
Open daily year-round, though trails may be difficult to navigate following heavy snowfall.
Stay strictly on the marked trails to protect the fragile sandstone and rare plant species; climbing on or under the bridge itself is prohibited.
