List of United States federally maintained roads
The vast majority of roads in the United States are maintained by the state or lower-level agencies. However, some roads are maintained by the federal government. Most of these are minor roads in national parks and national forests, which 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.
- Baltimore–Washington Parkway south of Maryland Route 175
- 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 Maryland State Highway Administration, Virginia Department of Transportation and United States Coast Guard.
- The Pentagon road network (also known as "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 as well as the road bridges over the Chesapeake and Delaware Canal are owned by the U.S. Army Corps of Engineers.
- Office of Federal Lands Highway, provides information on all federally owned roads