15 starts in Mecklenburg County. Not far from the state line, it crosses a narrow finger of the John H. Kerr Reservoir. The highway goes through the town of Clarksville and merges very briefly with US 58/VA 49 and then crosses over the main body of Lake Kerr. US 15 continues a little ways and merges with US 360. The two highways go on to the town of Keysville. After Keysville, US 15 branches off and goes to the town of Farmville. After a brief merge with US 460, US 15 goes through the towns of Dillwyn, New Canton (on the James River), Fork Union, and Palmyra before crossing I-64 at Zion Crossroads. After passing the interstate, US 15 goes through the towns of Gordonsville (with a quick merge with US 33) and Orange, and then on to Culpeper. After Culpeper US 15 runs concurrent with US 29. In Warrenton they briefly merge with US 17. South of Gainesville US 15 breaks off and crosses I-66. From there it goes on to Leesburg and then to the state line. Maryland US 15 starts in Maryland at Point of Rocks, crossing the Potomac River and then merges into US 340 just south of Frederick. In Frederick, US 40 merges with US 15 for a very short distance. From there US 15 goes through Thurmont and on to the Maryland/Pennsylvania border. Pennsylvania and New York US 15 enters Pennsylvania south of Gettysburg. Business Route 15 (Emmitsburg Road) goes through Gettysburg, while US 15 bypasses the borough; the bypass continues to York Springs. US 15 passes through Dillsburg before becoming a freeway near Grantham and the Messiah University campus. US 15 continues as a freeway until it intersects U.S. Route 11 and Pennsylvania Route 581 in Camp Hill. US 15 runs concurrent with US 11, passing Harrisburg on the west shore of the Susquehanna River. The concurrency ends at Shamokin Dam, where US 11 splits and follows the North Branch Susquehanna River, and US 15 follows the West Branch Susquehanna River north towards Williamsport where it passes through Lewisburg and the campus of Bucknell University (which is partially bisected by the highway). In the future, US 15 and US 11 will diverge in Selinsgrove, Pennsylvania, from which US 15 will proceed north on a road yet to be built, and connect back to its current alignment near Winfield, PA. 11 will be joined