South Middlebush Road (CR 615) Bridge H0403, Franklin Township

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Franklin Township

Replacement of the County Bridge No. H0403, South Middlebush Road (CR 615) over Six Mile Run, Township of Franklin

Construction Announcement

March 8, 2017:  This project’s construction was awarded to Interstate Contracting and Excavating, LLC on February 28, 2017.

South Middlebush Road (CR 615) will be fully closed to through traffic between Skillman Lane and Jacques Lane.  A posted detour route will include Amwell Road (CR 514) and Hamilton Street (CR 514), to Veronica Avenue, to State Route 27, to Claremont Road (CR 648).  It is planned to begin the road closure on or about Wednesday, June 28, 2017 for approximately 3 months.  Local access will still be maintained.  

Advance notice of the road closure will be posted along South Middlebush Road and updated on County website announcements.

The Project Location Map with Detour Route can be viewed here.

Project Description

The existing South Middlebush Road Bridge over Six Mile Run is a 2-lane heavily travelled single-span structure consisting of glue-laminated timber deck panels supported by stone and concrete abutments with concrete aprons.  The superstructure dates from 1981 and the abutments were built in three construction episodes, dating from prior to 1918, in 1918, and in 1981.  Traffic studies performed in 2011 shows an average daily traffic of 15,500 vehicles.

Somerset County is proposing to replace the South Middlebush Road Bridge over Six Mile Run with a 28-foot long single-span structure comprised of stress laminated glue-laminated timber superstructure with timber railings on concrete abutments with stone veneer similar to the current structure.  The roadway width will be widened by 6' at the bridge to carry two 11-foot lanes with 4-foot shoulders, and tapered to meet the existing roadway width at each approach.  The proposed bridge replacement will remove the bridge from the functional obsolete and scour critical lists.

Full roadway closure of South Middlebush Road will be necessary for the replacement of the bridge.  A posted detour will utilize State Route 27 for the north/south direction.  The road closure will extend for approximately 3 months.  Incentive/disincentive clauses have been included in the contract that will likely expedite the completion timeline.

This construction project is funded by FY2016 NJDOT Local Bridges Future Needs grant and County Funds.

Public Information Package

Project Summary Sheet

General Plan, Elevation, and Typical Section – Proposed

Detour Plan

Existing photographs