Our next stop in the swing through western Pennsylvania is McConnells Mills State Park. The signature of this park is a 19th century gristmill and adjacent covered bridge. It occupies 2,546 acres of the spectacular Slippery Rock Creek Gorge, which is a National Natural Landmark. Created by the draining of glacial lakes thousands of years ago, the gorge has steep sides while the valley floor is littered with huge boulders. Scenic overlooks and waterfalls are popular natural attractions.

The park has distinctive geology. The bedrock formed more than 300 million years ago as layers of sand, mud, and peat built up in what was a coastal area. After becoming rock, these different layers were lifted to the surface in several mountain-building events. The different strengths of these rocks cause them to erode differently, helping to make the varied landscape of the park. The gorge and the dramatic topography of the park were created by glaciers during the past two million years.

The Cleland Rock Scenic Vista – unfortunately this has become a bit overgrown.