Seneca Creek State Park in Maryland spans 6,300 acres of woodlands, fields, and waterside habitats across three main recreation areas. The northern Clopper Day-Use Area centers on 90-acre Clopper Lake, offering picnicking, boat rentals, playgrounds, historic sites, and access to more than 30 miles of trails. From the lake, a 14-mile greenway follows Seneca Creek as it winds south toward the Potomac River, passing the Schaeffer Farm Trails and other hiking routes.

Along the greenway are creekside paths, historic features, and views of Great Seneca Creek, a Class I-II waterway suitable for canoes and kayaks during wet periods. The Clopper Day-Use Area also includes a restored nineteenth-century cabin and a self-guided trail interpreting the Woodlands Estate site.

Where the park meets the Potomac River, it joins the Chesapeake and Ohio Canal National Historical Park at the Seneca Historic District, home to the ruins of the Seneca Stone Mill and quarries. Hunting is permitted in designated areas throughout the park. - AsNotedIn