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Route 318 Bridge Replacement Project

A portion of the Route 318 bridge was demolished in December 2023. Project Overview

This project is to replace the bridge that carries Route 318 over Interstate 376 in Mercer County. 

The bridge was struck by the boom of a truck on the morning of December 7 and sustained substantial damage. For the safety of traffic traveling eastbound under the bridge, it was determined the damaged portion of the bridge should be removed as soon as possible. The spans over the westbound lanes remain intact. 

The new bridge will have a higher vertical clearance of approximately 2 feet and will meet the current highway standards. 

The project will include some Route 318 roadway reconstruction to tie the new bridge into the existing roadway. Work will also include reconstruction of a portion of three of the interchange ramps, drainage upgrades, guiderail replacement, roadside signage, and pavement markings. Minor shoulder improvements and roadway repairs to Interstate 376 under the new bridge will also be completed. 

Route 318 Bridge location map.png

The bridge is located east of West Middlesex Borough and was built in 1966. Prior to the crash, it was rated in fair condition and was posted at 14 feet, 2 inches. It was used by approximately 3,200 vehicles a day, on average.

Traffic Impacts

A detour is currently in place for Route 318 traffic due to removal of the portion over the eastbound lanes of I-376. It is posted using Route 18 and Interstate 376 and will remain in place during construction. 

Near the end of the project, short-term detours of the ramps are anticipated in order to complete reconstruction work. 

A short-term closure of the westbound lanes of Interstate 376 will be needed to remove the remaining span of the bridge. A detour will be posted using off- and on-ramps near the bridge. Otherwise, short-term lane closures on Interstate 376 may be needed for certain construction activities.

Project Handout

Click on the picture for a PDF version of the project handout.

Click on the picture for a PDF version of the project handout.

Project Plans

Click on the picture for a PDF version of the project plans.

Click on the picture for a PDF version of the project plans.