NABSQNO 17T-565505-4530770![]() An unnamed waterfall natural bridge, Lawrence County, Pennsylvania Photo by Jay Wilbur NABSQNO 17T-565505-4530770. This very small unnamed waterfall natural bridge has been eroded through Vanport limestone by a spring that drains into Hell Run, also known as Hells Hollow. It is located in McConnells Mill State Park, about 5 miles west of Portersville, Lawrence County, Pennsylvania. Access is via the Slippery Rock Gorge Trail which crosses over the arch. This arch would probably not be noticed if it were not for the two other similar and larger waterfall natural bridges that are also found along this trail. More information can be found at this park interpretive site.
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