Road or highway · United States

How much does Appalachian Development Highway System cost?

The Appalachian Development Highway System is a federally authorized network of 33 highway corridors created to connect communities across the Appalachian region with interstate highways and national markets. Congress authorized construction in 1965. The system now spans 3,090 miles across 13 states. As of 30 September 2025, the Appalachian Regional Commission reported 2,712 miles complete, 72 miles open with later-stage work remaining, 62 miles under construction, 47 miles in design or right-of-way acquisition, and 197 miles in location studies. ARC's state-by-state review placed the cost of completing the remaining eligible corridor work at USD 15.155 billion in constant 2025 dollars; after accounting for pre-financed work and available funding, the remaining funding need was USD 14.404 billion. This page treats those system-wide figures separately from estimates for individual corridors such as North Carolina's Corridor K.