Dam 4 to Williamsport
This segment begins with a 4.7 mile roadwalk. While you can explore the next 1.4 miles or so of the towpath, repeated flooding and a landslide have made this detour mandatory even for those on foot. The roadwalk is actually very scenic, although traffic and narrow shoulders make the part along Dam Number 4 Road challenging. Your return to the towpath is dramatic, with the restored mill sitting by the Potomac just as it has since 1778. For the next 0.8 miles the Towpath passes beneath towering limestone cliffs at the upper end of "Big Slackwater". Caves dot the route here including the well known Howell Caves. At the inlet lock (41) the canal resumes and soon enters the half-mile long Dellinger Widewater. Past here, cliffs, often a hundred feet high, continue to near milepost 93. For a mile the towpath is a paved road through the summer home community of Falling Water. Soon the woods return and the Towpath passes through a quiet section to the village of Williamsport.