Demolition, site work, paving and new construction of a bridge / tunnel in Durham, New Hampshire. Conceptual plans call for the demolition of a bridge / tunnel; for the construction of a bridge / tunnel; for site work for a bridge / tunnel; and for paving for a bridge / tunnel.

This project included the replacement of the existing culverts at the Longmarsh Road crossing of Longmarsh Brook with a 59 foot clear span bridge. The Longmarsh Read crossing over Longmarsh Brook is a causeway like structure consisting of two 60-inch diameter corrugated metal pipes (CMP) with dry- laid stone headwalls. The existing structure was constructed in the 1980's and has been reconstructed after being washed out during storm events in 2006, 2007, and 2010, The combination of a low roadway profile elevation over Longmarsh Brook and the inadequate hydraulic capacity of the existing culverts results in overtopping of the roadway during extreme storm events. The proposed improvements involve both replacement of the existing structure for one with a greater hydraulic capacity and increasing the roadway profile elevation at the low point of the crossing. The Town previously had a FEMA Hazard Mitigation grant but due to the costs of the construction, the project was not able to demonstrate cost effectiveness under FEMA's benefit-to-cost analysis criteria. The Strafford Regional Planning Commission (SRPC) has been awarded a technical assistance grant to further explore approaches to meet the FEMA required Benefit/Cost requirements to potentially increase the likelihood that the Longmarsh Road project would be eligible for Federal assistance. Other potential sources of funding include State Bridge Aid. In addition, Durham Public Works has received a $2,040,000 Federal Grant and is moving forward with design of the Bennett Road culverts and roadway improvements to raise the roadway profile at the crossing location(s) to address flooding during similar events. This will provide a beriefit for those residents unable to access their property during extreme storm events. The project is included in the City's 2026-2035 Capital Improvement Program (CIP). As of May 18, 2026, further details have not yet been identified. *Project information has been obtained through a public capital improvement plan (CIP). A CIP is a financial schedule for short- and long-range projects which is updated regularly. Information listed in the CIP often evolves based on funding availability and the project details, including timeline and value, are subject to change. The content management team will continue to pursue additional details as they become available.