The 19th century gristmill is the centerpiece of McConnells Mill State Park.  The historic gristmill at McConnells Mill State Park opens Saturday, May 17th through Labor Day, Wednesdays through Sundays from 10:30 AM to 3:30 PM. After Labor Day, mill is open Thursdays through Sundays until October 26, 2025. Admission is free. Park at the Kildoo Picnic Area and hike down to the mill. Limited parking, for people with disabilities, may be available beside the mill.  Interpretive tours of the historic mill, given by staff or volunteer docents, are available by request.  Interpretive tours for groups may be scheduled by calling the Moraine State Park office at 724-368-8811.