Travelers on Interstate 79 in Butler County will face two years of single-lane traffic starting today at the Route 422 interchange (Exit 99) in Muddycreek because of a bridge replacement project, the Pennsylvania Department of Transportation announced.
The left lane will close in both directions at 7 a.m. as crews continue to build a crossover. Eventually, northbound traffic will cross to the southbound side, which will have one lane in both directions as the northbound bridge over Route 422 is replaced. The pattern will reverse itself next year for replacement of the southbound span.
The $14 million project includes ramp and roadway construction and installation of three digital message signs and a traffic camera.