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​Route 18 and Williamson Road Intersection Project

Route 18 and Williamson map.png

Project Overview

This project is to realign the east side of Williamson Road at its intersection with Route 18 in Hempfield, West Salem, and Sugar Grove townships, Mercer County.

The intersection is located on Route 18 (Conneaut Lake Road) just north of Thiel College on the north side of Greenville.

The project will include realigning Williamson Road on the east side to be directly opposite its intersection on the west side. It is currently offset by approximately 10 to 12 feet. It will also include radii improvements at all corners and sight distance improvements on the southeast corner of the intersection.

Work is expected to occur during the 2025 construction season.

This project is funded at least in part by the Bipartisan Infrastructure Law (BIL). 

Traffic Impact

A detour for Williamson Road will be required during construction and is expected to be in place for approximately four months. The proposed 3-mile detour route will be posted using Route 58 (College Avenue) and Route 358 (East Main Street/ Hadley Road).

Some work will require temporary lane restrictions on Route 18 with traffic control by flaggers.

Content Editor

Project Information

​County: Mercer

State Route: Route 18 

Project Type: Intersection Improvement

Expected Construction Season: 2025

Last Updated: September 30, 2023

Contact Information

Project Manager, Michael R. Hunkele, P.E.

mhunkele@pa.gov or 814-678-7173

​Press Officer, Jill Harry

jharry@pa.gov or 814-678-5035

Accessibility

The project documents can be made available in alternative languages or formats if requested. If you need translation or interpretation services, have special needs, or have special concerns that require individual attention, contact the project manager.