Interstate 279 in Ross will be fully closed overnight periodically from June 15 into August while the closed Jacks Run Road Bridge over the highway is being demolished, the Allegheny County Department of Public Works announced.

Specific dates for closures, which include the HOV lanes, are not yet known, Public Works spokesman Brent Wasko said.

Swank Construction, the contractor on the $2.8 million project, will be able to close the northbound lanes for up to 23 days and the southbound lanes for up to 16 days, Wasko said. Closures could be in one direction or the other or both at the same time.

The closures will occur from 9 p.m. to 5 a.m. Sundays through Fridays, 9 p.m. Fridays to 9 a.m. Saturdays and 9 p.m. Saturdays to 9 a.m. Sundays.

I-279 northbound will be closed between the McKnight Road/Evergreen Road exit ramp, Exit 4, and the I-279 North entrance ramp from Camp Horne Road.

Southbound I-279 will be closed between the Camp Horne Road exit ramp, Exit 8, and the I-279 South entrance ramp from McKnight Road.

I-279 northbound will be detoured using McKnight Road, Babcock Boulevard, Rochester Road, Lowries Run Road and Camp Horne Road. I-279 southbound traffic will be detoured using the same route in reverse.

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. Union Avenue traffic to I-279 northbound will be detoured using the same route in reverse.

I-279 southbound traffic to Cemetery Lane in Ross will be detoured using Camp Horne Road, Lowries Run Road, Rochester Road and Perry Highway. Cemetery Lane traffic to I-279 northbound will be detoured using the same route in reverse.

When the interstate is not fully closed, these traffic restrictions will be in place:

• Periodic single-lane closures on I-279 northbound and southbound under the bridge between 7 p.m. and 6 a.m. daily through the remainder of the project, except from May 31 through June 5 when lane closures will end at 3 p.m.

• From May 31 through June 5, the I-279 HOV lanes will close in the outbound (northbound) direction each night from 7 p.m. until the directional switch is made for the morning rush hour at 6 a.m.

• The I-279 northbound on-ramp from Cemetery Lane will be closed periodically between 7 p.m. and 6 a.m. daily from June 5 through the remainder of the project. Traffic will be detoured using Perry Highway, Rochester Road, Lowries Run Road and Camp Horne Road.

The county closed the bridge on July 3, 2025, after inspectors found corroded steel within its only pier. Work on the demolition began April 27.

Construction of a new bridge, which will be a separate project, is expected to start in 2027.