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Appalachian Development Highway System



ARC-FHWA Webinar: Economic Impacts of the Appalachian Development Highway System
In this one-hour webinar held December 13, 2017, ARC and the Federal Highway Administration reviewed the key findings and methods of the 2017 study Economic Analysis of Completing the ADHS, and discussed the role the ADHS plays in the Appalachian Region's economic development.
Watch the recorded webinar
Download the webinar presentation (PDF: 5 MB)
Appalachian Development Highway System, Feb. 25, 2018
Map of the Appalachian Development Highway System, February 25, 2018
ADHS Status Report Available
Status of ADHS corridors by state, as of September 30, 2017.  
Status of the Appalachian Development Highway System 2017 (PDF: 8.4 MB)

In 1964, the President's Appalachian Regional Commission (PARC) reported to Congress that economic growth in Appalachia would not be possible until the Region's isolation had been overcome. Because the cost of building highways through Appalachia's mountainous terrain was high, the Region had never been served by adequate roads. Its network of narrow, winding, two-lane roads, snaking through narrow stream valleys or over mountaintops, was slow to drive, unsafe, and in many places worn out. The nation's interstate highway system had largely bypassed the Appalachian Region, going through or around the Region's rugged terrain as cost-effectively as possible.

The PARC report and the Appalachian governors placed top priority on a modern highway system as the key to economic development. As a result, Congress authorized the construction of the Appalachian Development Highway System (ADHS) in the Appalachian Regional Development Act of 1965. The ADHS was designed to generate economic development in previously isolated areas, supplement the interstate system, connect Appalachia to the interstate system, and provide access to areas within the Region as well as to markets in the rest of the nation.

The ADHS is currently authorized at 3,090 miles. At the end of FY 2017, 90.5 percent of the miles authorized were complete, open to traffic, or under construction. Many of the remaining miles will be among the most expensive to build. Completion of the ADHS remains a top priority for ARC.

Appalachian Development Highway System Pages

Map of the ADHS
ADHS Approved Corridors and Termini
Work Remaining on the ADHS
Funding for the ADHS

Appalachian Development Highway System Reports

ADHS Status Report, as of September 30, 2017 (PDF: 8.4 MB)

Executive Summary: ADHS 2012 Cost-to-Complete Report (PDF: 1.3 MB)
ADHS 2012 Cost-to-Complete Report
ADHS Completion Plan Report, September 2013 (PDF: 4 MB)
Economic Analysis of Completing the ADHS