In cooperation with the Federal Highway Administration and the state departments of transportation (DOTs), the Appalachian Regional Commission (ARC) regularly updates the cost-to-complete estimates for the unfinished Appalachian Development Highway System (ADHS) corridors. The 2021 ADHS cost-to-complete estimate is $10.3 billion (in 2020 dollars). In addition, state DOTs have expended $598.7 million in non-federal funds to pre-finance ADHS projects. These pre-finance costs are potentially eligible for federal reimbursement. As of December 31, 2020, $1.25 billion was available to states for the ADHS. This includes federal funding previously apportioned to the Appalachian states, federal discretionary grants awarded for ADHS projects, and state funds explicitly committed for ADHS projects. The amount of funds needed to complete all unfinished ADHS corridors is $9.7 billion.

This information has been updated in the ADHS 2025 Cost-to-Complete Estimate Report.

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