The Closure has been pushed back. It will begin at 9 pm on April 14, per a PennDOT press release issued on 4/5/2021.
This information has been provided directly from PennDOT (4/1/21):
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).
The 80-day detour is scheduled to be implemented at 9 PM Tuesday, April 6. 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 www.511PA.com. 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 www.penndot.gov/District8.
Residents, please note, there are other routes available however PennDOT may only offer state roads as alternatives as you see listed above.