Reducing congestion, improving safety, and promoting economic vitality for the towns of Derry & Londonderry, New Hampshire

The Towns of Derry and Londonderry (the Towns) and the New Hampshire Department of Transportation (NHDOT), in cooperation with the Federal Highway Administration (FHWA), are advancing an updated environmental study for the I-93 Exit 4A Project (Project). The Project consists of a new diamond interchange on I-93 in the Town of Londonderry, approximately one mile north of Exit 4. The new diamond interchange would provide access to the east side of I-93. A 1-mile connector roadway would be built on new alignment from the interchange to Folsom Road, near the intersection of North High Street and Madden Road, in the Town of Derry. Folsom Road, and subsequently Tsienneto Road, would be upgraded, and the intersections would be improved. In total, the Proposed Project corridor from I-93 to the intersection of Tsienneto Road and NH Route 102/Chester Road would be 3.2 miles. The purpose of the Project is to reduce congestion and improve safety along NH 102, from I-93 easterly through downtown Derry and to promote economic vitality in the Derry/Londonderry area.

Planning for the Project began in 1985, with a Draft Environmental Impact Statement (DEIS) being completed in 2007. A Public Hearing on the DEIS was held on September 12, 2007. In October 2015, the Governor's Office directed NHDOT to accelerate the Exit 4A Project, and the Project was subsequently incorporated in the state’s Ten Year Transportation Improvement Plan for 2017–2026. NHDOT and the Towns entered into an agreement under which NHDOT will provide administrative oversight to complete the environmental review process, then the Project will transition to NHDOT control during final design and construction.

Due to the amount of time that has elapsed since the 2007 DEIS, the FHWA has requested the preparation of updated studies that will be documented in a Supplemental Draft Environmental Impact Statement (SDEIS), and ultimately a Final Environmental Impact Statement (FEIS) in accordance with the National Environmental Policy Act (NEPA). These updated studies and documentation began in June 2016. The SDEIS provided an up-to-date assessment of the environmental effects of the Project and the evaluation of reasonable alternatives that will consider updated information including but not limited to, traffic, socioeconomic projections, land development proposals in the project area, and changes in environmental resources and regulatory requirements. After completion of the SDEIS in October 2018 and the presentation of a Preferred Alternative at a Public Hearing in December 2018, a Proposed Action was chosen with input from State and federal Agencies; State, Town and local officials; and the public. NHDOT and FHWA has now completed the NEPA environmental review process by issuing a Combined Final EIS (FEIS) and Record of Decision (ROD) in February 2020.

Construction of the Project is anticipated to begin in late 2020 and be completed in 2024. The programmed cost of the Project within the 2021–2030 Draft Ten Year Plan is $95,702,677, including preliminary engineering, right-of-way, and construction costs.

NEPA Process Concluded

This website documents the NEPA process which has been concluded, and no further updates will be posted to this site. For current project information, please visit the NHDOT project webpage.


FEIS Available

The Final Environmental Impact Statement & Record of Decision is available for public review.


Meetings & Events

None scheduled at this time