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Natural Tunnel State Park offers seven walking trails, the longest one being 1.1 miles long. These trails lead to the unique features of the park: the tunnel floor, Lover's Leap, Tunnel Hill and Gorge Ridge. A 500-foot boardwalk and observation deck provide accessibility to guests with disabilities. The creation of Natural Tunnel began more than a million years ago in the early glacial period when groundwater bearing carbonic acid percolated through crevices and slowly dissolved surrounding limestone and dolomite bedrock. Then, what is now Stock Creek was probably diverted underground to continue carving the tunnel slowly over many centuries. The walls of the tunnel show evidence of prehistoric life, and many fossils can be found in the creek bed and on tunnel walls. Although pedestrian access to the tunnel is prohibited, our interpretative staff offers the Stock Creek Passage tour, where small groups are led through the tunnel via Stock Creek and the geologic processes that led to the creation of the tunnel are discussed. Take a few minutes to explore the links to our facilities and programs listed
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