https://www.adventurecycling.org/routes-and-maps/us-bicycle-route-system/
National Corridor Plan
The National Corridor Plan is the blueprint for U.S. Bicycle Route development, and shows what the 50,000-mile network will look like when complete.
Corridors that have been developed into routes and officially designated as U.S. Bicycle Routes are shown with dark solid lines. Undeveloped corridors are shown with light dotted lines, and are generally only concepts until a route is researched and designated. Corridors can be added or changed depending on the opportunities and interests of a given state.
To date, 17,734 miles of U.S. Bicycle Routes have been established in 31 states: Alaska, Arizona, California, Connecticut, Florida, Georgia, Kentucky, Idaho, Illinois, Indiana, Kansas, Maine, Maryland, Massachusetts, Michigan, Minnesota, Missouri, Nevada, New Hampshire, New York, North Carolina, North Dakota, Ohio, Pennsylvania, Tennessee, Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin, and the District of Columbia.