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) 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 and the presentation of a Preferred Alternative at a Public Hearing, a Proposed Action was chosen with input from State and federal Agencies; State, Town and local officials; and the public. NHDOT and FHWA will complete the NEPA environmental review process by issuing a Combined Final EIS (FEIS) and Record of Decision (ROD).

Construction of the Project is anticipated to begin in 2020 and be completed by 2023. The programmed cost of the Project within the 2017–2026 Ten Year Plan is $56,855,000, including preliminary engineering, right-of-way, and construction costs.


The Supplemental Draft Environmental Impact Statement is available for public review. The review period to submit comments is open until January 4, 2019



NEW - Public Hearing
on 12/05/2018

A Joint Public Hearing on the Design Layout, Supplemental Draft EIS, and permit applications under Section 404 of the Clean Water Act and New Hampshire Wetland Rules was held on Wednesday, December 5, 2018, at 6:00 PM at the West Running Brook Middle School, 1 West Running Brook Lane in Derry.

The hearing provided an opportunity for all interested parties to comment on the proposed project. Additionally, written comments were accepted at the meeting and will be accepted for up to 30 days after the hearing for inclusion in the official record. An opportunity for public comments and questions was provided during the meeting. Members of the project team were available to informally discuss the project alternatives and impacts.

The Public Hearing Handout is available here.

The Hearing Plans are available here.