The Seneca Creek Valley forms the long, wooded corridor that carries Seneca Creek from Clopper Lake south to the Chesapeake and Ohio Canal on the Potomac River. Within Seneca Creek State Park, the valley stretches for fourteen scenic miles, winding through forests, fields, wetlands, and historic sites that reflect centuries of settlement and industry. Clopper Lake anchors the northern end, surrounded by day?use areas, trails, and interpretive features that explore the region's early estates. As the creek flows south, the valley broadens into a landscape of bluffs, meadows, and creekside paths. More than fifty miles of trails — ranging from short loops to a 16 milers — follow the waterway and its upland ridges. The Seneca Creek Greenway traces the creek's full length, linking Clopper Lake, Schaeffer Farm, Black Rock Mill, and the historic district at Riley's Lock in the Chesapeake and Ohio Canal National Historical Park. Near the Potomac, the valley meets the C and O Canal, where the ruins of the Seneca Stone Mill and quarries mark the area's industrial past. Today, the Seneca Creek Valley offers one of Montgomery County's most varied outdoor experiences, combining recreation, natural habitats, and historic landscapes along the creek's journey to the Potomac. - AsNotedIn