Project Overview
The is a NHDOT project that will include roadway improvements to an approximately 1.7 mile stretch of US Route 1 in Portsmouth from Wilson Road to Ocean Road. The purpose of the project is to enhance traffic operations and improve safety for all travelers along this section. The City of Portsmouth has identified related projects in the City's Capital Improvement Plan, including the addition of separated bicycle and pedestrian paths and improvements to the pedestrian crossings at intersections within this corridor. These projects are also supported in the City's Bicycle and Pedestrian Plan. This project will involve a multi-year design and engineering process and is not anticipated to start construction until 2031. More project information can be found at the NHDOT project web page provided below.
Project Map
Project Updates
Portsmouth 29640
Improvements to approximately 1.7 miles of US 1, from Wilson Road to Constitution Drive and from White Cedar Drive to Ocean Road
STATUS Design
For more information, please visit the NH DOT page
https://www.dot.nh.gov/projects-plans-and-programs/project-center/portsmouth-29640
Project Documents
This section includes citywide planning and policy documents that guide transportation and infrastructure improvements in Portsmouth, including the Bicycle and Pedestrian Plan, Capital Improvement Program (CIP), and Complete Streets Design Guidelines, which inform project prioritization, funding, and design standards.
General
- Bicycle and Pedestrian Plan Aug 1, 2025
- FY27 - FY32 CIP Jul 1, 2026
- Complete Street Design Guidelines Jun 1, 2017
Project FAQ
What is the US Route 1 Corridor Improvement Project?
The project is a New Hampshire Department of Transportation (NHDOT) roadway improvement project along approximately 1.7 miles of US Route 1 in Portsmouth, extending from Wilson Road to Ocean Road.
What is the purpose of the project?
The purpose of the project is to enhance traffic operations and improve safety for all travelers along this section of US Route 1.
What improvements are being considered?
The project includes roadway improvements along the corridor. The City of Portsmouth has also identified related improvements in its Capital Improvement Plan, including separated bicycle and pedestrian paths and improved pedestrian crossings at intersections.
Who is responsible for the project?
The project is being led by the New Hampshire Department of Transportation (NHDOT). The City of Portsmouth is coordinating with the State and has identified related improvements that align with City planning efforts.
When is construction expected to begin?
The project involves a multi-year design and engineering process, and construction is not anticipated to begin until 2031.