List of United States federally maintained roads

The vast majority of roads in the United States are maintained by state or lower-level agencies. Most roads in the District of Columbia are maintained by the District of Columbia Department of Public Works. However, some roads are maintained by the federal government. Most of these are minor roads in national parks and national forests, and are not listed here. However, a few roads have been developed to connect sites in the national park system or to protect routes of scenic or historic significance, and some roads in national parks are major enough to list.

National parkways:
*Baltimore-Washington Parkway
*Blue Ridge Parkway
*George Washington Memorial Parkway
*John D. Rockefeller, Jr. Memorial Parkway
*Natchez Trace Parkway
*Foothills Parkway
*Suitland Parkway

Roads that are part of other park service sites:
*Clara Barton Parkway in Clara Barton National Historic Site
*Colonial Parkway in Colonial National Historical Park
*Going-to-the-Sun Road in Glacier National Park
*Rock Creek and Potomac Parkway in Rock Creek Park
*Skyline Drive in Shenandoah National Park

Other federally maintained roads:
*The Woodrow Wilson Bridge, the only federally owned bridge in the Interstate Highway System, is owned by the Federal Highway Administration but maintained by the District of Columbia Department of Public Works, Maryland State Highway Administration, Virginia Department of Transportation and United States Coast Guard.
*The Pentagon road network (a.k.a. the "Mixing Bowl") was federally owned until 1964, when it was transferred to the State of Virginia.
*The Sagamore Bridge and Bourne Bridge over the Cape Cod Canal are owned by the U.S. Army Corps of Engineers.