Funding for the ADHS
From FY 1965 through FY 1998, federal funding for the ADHS was appropriated by Congress through the Appalachian Regional Development Act. From FY 1999 through FY 2012, ADHS funding was provided from the federal Highway Trust Fund through the Transportation Equity Act for the 21st Century and the Safe, Accountable, Flexible, Efficient Transportation Equity Act: A Legacy for Users.
In July 2012, Congress changed the way the ADHS is funded. The transportation law Moving Ahead for Progress in the 21st Century (MAP-21) includes ADHS funding as part of the larger Surface Transportation Program (STP). Under MAP-21, STP funds are apportioned to the Appalachian states, with each state using the funding at its own direction. The law also increases the federal share of funding for ADHS corridors and access roads from 80 percent to 100 percent. The 100 percent federal share applies to funds apportioned to the ADHS in prior years and new funds apportioned to the states and used for ADHS construction. The authority for 100 percent federal funding extends from FY 2012 through FY 2021.