US 29. It crosses the Potomac River, and links the District in Georgetown on the north shore to Reston and Arlington, Virginia to the south. References External links Maryland Transportation Authority, Francis Scott Key Bridge website Steve Anderson's DCroads.net: Francis Scott Key Bridge (I-695) Crossings of the Patapsco River Transportation buildings and structures in Baltimore Toll bridges in Maryland Bridges completed in 1977 Tolled sections of Interstate Highways Interstate 95 Continuous truss bridges in the United States Road bridges in Maryland Bridges on the Interstate Highway System Steel bridges in the United States 1977 establishments in Maryland