McConnells Mill is a state park located north of Pittsburgh in rural Lawrence County.
The park is named after the land's previous owner, a 19th century mill operator Thomas McConnell. In the 1870s, he replaced the waterwheel with water turbines and the grindstones with rolling mills. This made McConnell's Mill one of the first rolling mills in the country. The mill processed oats, corn, buckwheat and wheat until it was closed in 1928.
McConnells Mill State Park encompasses 2,546 acres of the spectacular Slippery Rock Creek Gorge. Created by the draining of glacial lakes thousands of years ago, the gorge has steeps sides and the valley floor is littered with huge boulders and is a national natural landmark.
The historic gristmill is open for tours and the park is a terrific place for hiking, rock climbing, picnicking, boating and fishing.
Daily, sunrise to sunset.
Free, on-site parking is available.