 US 11 begins at the West Virginia state line on the south bank of the Potomac River . The highway crosses the Potomac River on a two @-@ lane bridge just south of its confluence with Conococheague Creek . The bridge passes over Potomac Park and the Chesapeake and Ohio Canal National Historical Park . At the east end of the bridge , US 11 enters the town of Williamsport , where the highway is municipally @-@ maintained . The federal highway makes a turn to the north , then makes a sharp turn to the east onto Potomac Street adjacent to the Williamsport Visitor Center of the historical park . Within the Williamsport Historic District , US 11 intersects MD 68 ( Conococheague Street ) and MD 63 . MD 63 joins MD 68 in a concurrency on Conococheague Street to the south and US 11 on Potomac Street east to Artizan Street , where MD 63 heads north out of town . US 11 veers northeast and heads through a more suburban area of Williamsport . The federal highway leaves the town of Williamsport and becomes state @-@ maintained immediately before expanding to a four @-@ lane divided highway for its partial cloverleaf interchange with I @-@ 81 ( Maryland Veterans Memorial Highway ) . 
