South Main Street/Route 12A Bridge Replacement Project

Welcome to the South Main Street/Route 12A Bridge Replacement "Dry Bridge" project page. This page contains updates, contact information, documents, and answers to frequently asked questions pertaining to this project.

New information is added as it is received. You can subscribe to receive alerts by subscribing to our LebAlert service

You can easily find this page again by going to LebanonNH.gov/DryBridge

  1. Overview
  2. Project Information
  3. Current Alerts

Project Overview 

What is the scope of this project? 

The purpose of this project is to replace and widen the South Main Street Dry Bridge (Route 12A) over the railroad right-way. The existing South Main Street Bridge was constructed in 1949 and is on the NHDOT List of Deficient Bridges (Red list - South Main Street “Dry Bridge” NHDOT#13558A, Bridge #062/117). This bridge is narrow and does not meet current capacity needs. 

In 2002, the bridge was inspected and significant deficiencies were noted to include deterioration of the concrete and metal fatigue. The bridge rail has been temporarily repaired to help with the immediate needs of protecting pedestrian and vehicular traffic. This will stay in place until such time that a new bridge is constructed. 

The design and construction of the proposed replacement bridge is eligible for partial participation through the NHDOT Municipal Bridge Aid Program and Federal Aid funds. The current cost estimate to replace the bridge is $8.7M to satisfy NHDOT and railroad requirements. It is estimated that the net NHDOT participating portion is $6.58M, with the City’s share estimated at $2.12M.

How long is this going to take? 

Design and Permitting Phase: 2019-2022
Construction Phase: 2022-2023

Which streets are involved?

Affected streets include: 

  • South Main Street
  • Main Street
  • Seminary Hill

Which properties will be affected? 

The bridge reconstruction project includes about 1,200 feet starting from the area of 40 South Main Street (for bridge approach work) to the west edge of the Seminary Hill/Main Street/Maple Street Intersection. The project includes limited roadway widening, bridge widening, access road relocation to the old rail yard, drainage and utility impacts, and modifications.

How will I know what is happening?

We strongly encourage you to subscribe to receive alerts via email or text through our LebAlert service at LebAlert.Regroup.com. Periodic project updates will be posted to this project page, as well as sent to subscribers.

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Contact Information


Public Works Department

Main: 603-448-3112 

Project Contacts

Brian Vincent
PE City Engineer
Email: brian.vincent@lebanonnh.gov
Phone: 603-448-3112 x1515