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UPDATE: Mountain Road Ramp Detour Begins Next Week for Sound Wall Project on I-81 in Dauphin County


Harrisburg, PA – A detour will begin next week for the Mountain Road ramps to southbound Interstate 81 in Dauphin County. The closure is due to a scheduled lane restriction associated with an approximately 2-mile sound wall project that extends from Interstate 83 (Exit 70) to Mountain Road (Exit 72). 

Originally scheduled to begin Tuesday, April 6, the 80-day detour has been rescheduled to be implemented at 9 PM Wednesday, April 14. 

Motorists on Mountain Road wishing to access southbound I-81 should travel on northbound I-81 to Linglestown Road (Exit 77), then access southbound I-81 from Linglestown Road. An alternate route would be Mountain Road to westbound Route 22 to northbound I-83 to the I-81/I-83 Split (Exit 70) to southbound I-81.

This $8,982,712 contract was awarded to Deblin Inc., of Mechanicsburg, and includes the construction of six sections of sound wall, drainage improvements, shoulder widening, new guide rail, barrier, signs and pavement markings.

This project is expected to be completed in November of 2021.

Motorists can check conditions on major roadways by visiting 511PA, which is free and available 24 hours a day, provides traffic delay warnings, weather forecasts, traffic speed information and access to more than 1,000 traffic cameras. 

511PA is also available through a smartphone application for iPhone and Android devices, by calling 5-1-1, or by following regional Twitter alerts accessible on the 511PA website.

Subscribe to PennDOT news and traffic alerts in Adams, Cumberland, Dauphin, Franklin, Lancaster, Lebanon, Perry, and York counties at

Information about infrastructure in District 8, including completed work and significant projects, is available at Find PennDOT’s planned and active construction projects at 

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MEDIA CONTACT: Dave Thompson, 717-418-5018