 US 301 enters Maryland at the Virginia state line on the right bank of the Potomac River near Dahlgren in King George County, Virginia, from which the U.S. Highway continues toward Bowling Green and Richmond.The highway crosses the Potomac River on the Governor Harry W. Nice Memorial Bridge, a two-lane continuous truss bridge.US 301 expands to a four-lane divided highway just east of the southbound-only toll plaza for the bridge and to the north of the Morgantown Generating Station.