Route 18 and Route 58 Improvement Project

County: Mercer
Municipality: Borough of Greenville
State Route: Route 18 and Route 58
Project Type: Roadway improvements
Construction Start: Fall 2024
Construction End: Spring 2026
Last Updated: 11/03/2025

This is a project to improve Route 18 from the intersection with Route 358 to the intersection with Mill Hill Road, and Route 58 from the intersection with Route 18 to East Craig Street near Thiel College in the Borough of Greenville.

It includes improvements at three intersections, including realignments at Route 18 and Route 58, Route 18 and Packard Avenue, and Route 58 and Packard Avenue. Proposed work also includes new or upgraded sidewalk, curb ramps, driveway entrances, milling and paving, base repair, new traffic signal, drainage updates and pavement marking updates.

Work started in 2024 with roadway repairs and paving on Route 18 from Route 358 to Route 58. After a pause in construction for winter, work restarted in April 2025. 

The project is scheduled to be completed in spring 2026.

Construction will be completed in five phases.

Phase 1 – Drainage, tree removal, and roadway widening along Route 18 from Shenango Street to Packard Avenue. Completed. 

Phase 2 – Drainage, roadway widening, and sidewalk and ADA-compliant curb ramp construction along Route 18 from Main Street to Packard Avenue and Orangeville Road to Front Street, as well as new signal foundations at the intersections of Route 18 and Route 58, 358, and High Street (Route 4005). Completed. 

Phase 3 – Additional roadway widening, sidewalk and ADA-compliant curb ramp construction along Route 18 from Main Street to Packard Avenue and Orangeville Road to Front Street, and reconstruction at the intersection of Route 58 and Route 18. Completed. 

Phase 4 – Additional reconstruction work, including removal of the existing pavement and installation of a new traffic signal at the intersection of Route 58 and Route 18. This phase will be completed in spring 2026. 

Phase 5 – Remaining milling, placing the final layer asphalt throughout the project area, landscaping, and pavement markings. Motorists may encounter temporary lane restrictions with traffic controlled by flaggers. This phase will be completed in spring 2026.

Work in 2026 is expected to include completing the remaining sidewalk and curb and all work included in Phase 5.  

The contractor is Lindy Paving of New Galilee, PA. The contract cost is $7,976,304.25. The project is being funded predominately with state and federal funds. Thiel College will fund some improvements on the campus done in connection with the project.

Drivers should be alert for lane restrictions and traffic controlled by flaggers as paving work is completed on Route 18 from Route 846 (Orangeville Road) to the Shenango River bridge. Work is expected to be done during the overnight hours, approximately 7:00 PM to 7:00 AM, starting September 22 and take about five days to complete.

Drivers are also reminded that starting September 30, 2025, Route 58 will be closed to westbound traffic between the intersection with Packard Avenue Extension and the intersection with Ridgeway Avenue. The detour is expected to remain in place until October 7, 2025.

The detour for cars will be posted using Route 18 to Williamson Road to Route 58. The truck detour will be posted using Route 18 to Route 322 to Route 58.

Access to drives and businesses will be maintained throughout the project.