Demolition of a bridge and construction of new bridges are scheduled to cause closures and restrictions on interstates 279 and 79 in Allegheny County this week.
Closures of I-279 in Ross are scheduled overnight four days this coming week while crews work to demolish the closed Jacks Run Road bridge over the highway.
Meanwhile, there will be two closures of I-79 in Marshall and Franklin Park as crews work to build bridges that are part of the new Wexford interchange.
All work is weather dependent.
Bridge demolition impacts I-279
The Allegheny County Department of Public Works announced that southbound I-279 will be fully closed between the Camp Horne Road exit ramp and the I-279 south entrance ramp from McKnight Road from 9 p.m. Wednesday to 5 a.m. Thursday; 9 p.m. Thursday to 5 a.m. Friday; and 9 p.m. Friday to 5 a.m. Saturday.
The I-279/I-579 HOV lanes will close in the northbound direction at 9 p.m. on Wednesday, Thursday and Friday until the directional switch is made at 6 a.m. the following morning.
A planned closure of southbound I-279 and the HOV lanes from 9 p.m. Monday to 5 a.m. Tuesday was canceled because of an equipment issue, public works spokesman Brent Wasko said.
There will be a single lane closure on I-279 southbound underneath the bridge from 9 p.m. Tuesday to 5 a.m. Wednesday.
When I-279 southbound is fully closed, the detours will be:
• I-279 southbound traffic will be detoured back to I-279 using Camp Horne Road, Lowries Run Road, Rochester Road, Babcock Boulevard and McKnight Road.
• I-279 southbound traffic to Union Avenue in Ross will be detoured using Camp Horne Road, Lowries Run Road, Rochester Road, Perry Highway, Highland Avenue, and Gass Road.
• I-279 southbound traffic to Cemetery Lane in Ross will be detoured using Camp Horne Road, Lowries Run Road, Rochester Road, and Perry Highway.
The closures are expected to have significant impacts on West View, the borough announced. Those driving through the borough should anticipate increased traffic volumes on Perry Highway, Highland Avenue, Rochester Road and other roads.
Particular impacts are expected near the Perry Highway and Highland Avenue corridor, the borough said. Residents, businesses and commuters should expect longer travel times during overnight closure periods and use caution when traveling the designated detour routes.
Closures of I-279 and the HOV lanes are expected to continue through August, the county said.
The Jacks Run Road bridge has been closed since July 3, 2025 after inspectors found corrosion in its pier. Construction of a new bridge is scheduled to start next year.
Wexford interchange work impacts I-79
The delivery and placement of bridge beams will cause closures and restrictions on I-79 in Marshall and Franklin Park, where the new $46.5 million Wexford interchange is under construction, PennDOT announced.
The southbound lanes are scheduled to be closed at the Route 910 Wexford interchange from 11 p.m. Monday to 6 a.m. Tuesday, and from 11 p.m. Tuesday to 6 a.m. Wednesday. The northbound lanes will be closed at the interchange from 7 p.m. Friday to 6 a.m. Saturday.
Southbound I-79 will be reduced to a single lane from 7 p.m. to 11 p.m. Monday and Tuesday, while northbound will be reduced to a single lane from 7 p.m. Monday to 6 a.m. Tuesday and from 7 p.m. Tuesday to 6 a.m. Wednesday.
Southbound I-79 will be reduced to a single lane again from 7 p.m. Wednesday to 6 a.m. Thursday.
Local and state police will control traffic at signalized intersections during the closures and detours.
When closed, the posted detours will be:
Southbound I-79
• From southbound I-79, take the Route 910/Wexford (Exit 73) exit
• Cross over Route 910/Wexford Bayne Road onto the on-ramp to southbound I-79
Northbound I-79
• From northbound I-79, take the Route 910/Wexford (Exit 73) exit
• Cross over Route 910/Wexford Bayne Road onto the on-ramp to northbound I-79
To accommodate traffic on the detour, the signal at the Route 910/Wexford Bayne intersection will give priority to I-79 travelers. Drivers on Route 910/Wexford Bayne Road can expect delays.
The project, started in 2025, is reconfiguring the interchange into a “single point urban interchange.”
The northbound off-ramp from I-79 to Route 910, the northbound on-ramp from Route 910 to I-79, and the signalized intersection for them on the eastern side of the highway will be removed. The ramps will be replaced by two new bridges over the interstate — one south of Route 910 for northbound traffic getting off of I-79 and one north of Route 910 for those getting on and traveling north.
When complete, everything will connect at one intersection on the western side of the Route 910 bridge.
Work on the interchange is scheduled to continue through the 2027 construction season.