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Project Overview

Remediate rock along US 209/Mauch Chunk Street in Mahoning Township, Carbon County.

Workers will remove fallen rock from the roadside, scale back and remove additional rock from the mountain, install mesh netting to help prevent future rocks from falling, mill and pave US 209 north in the work area, and perform minor roadway drainage improvements.  

Over the past several years multiple large rocks slid off the side of Flagstaff Mountain (“Mansion House Hill”) alongside US 209, resulting in the need for this remediation work.

For more information on projects occurring or being bid this year, those made possible by or accelerated by the state transportation funding plan (Act 89), or those on the department’s Four and Twelve Year Plans, visit

Motorists can check 511PA before we they travel for the latest conditions on more than 40,000 roadway miles, including color-coded winter conditions on 2,900 miles, 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 860 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.

Follow regional PennDOT information on Twitter at, and like the department on Facebook at  

Project Contact

​Ronald J. Young, Jr., M.P.A.
District Press Officer

Project Statistics

This section of US 209 has an average daily traffic volume of 9,814 vehicles.

Road-Con, Inc. of West Chester, Pa., is the general contractor on the $3,550,829 project that is expected to be complete in May 2020.

Detour Information

​There will be full closures of US 209 north and south between Oak Drive and Race Street weekdays (Mondays through Fridays) between the hours of 8:30 AM and 3:00 PM. These closures are anticipated to occur every week through the end of the project.

During these full closures, US 209 traffic will be detoured on Packerton Dam Road, Hemlock Drive, PA 902, South 9th Street, PA 443, US 209, Harrity Road, Fairyland Road, Long Run Road, Maury Road, and PA 903.

A single lane will be open on US 209 north and south weekdays from 3:00 PM to 8:30 AM and from 3:00 PM Fridays through 8:30 AM Mondays.