LONDONDERRY — As the Interstate 93 work continues, the New Hampshire Department of Transportation announced a schedule of night traffic work and lane closures.

The night work was slated to begin Jan. 13 on the I-93 northbound and southbound lanes in Londonderry and consists mainly of the removal of the structural steel for the Old Pillsbury Road/Ash Street Bridge over I-93.

The interstate widening project between Exits 1 and 5 — from the Massachusetts state line to the Interstate 293 split in Manchester — is one of the largest projects the DOT has ever undertaken.

The project passes through parts of Salem, Windham, Derry and Londonderry with phases broken down over the construction time frame into specific work timelines as the completion date gets closer.

The Old Pillsbury Road/Ash Street bridge was officially named the Robert J. Prowse Memorial Bridge, a 216-foot long, continuous welded steel structure was built in 1961 and named as a memorial to Prowse, an engineer and bridge designer.

The night work is scheduled to be done between the hours of 7 a.m. and 6 p.m. and will require the use of lane closures. Northbound and southbound I-93 traffic will encounter lane closures and intermittent 10- to 15- minute delays as the steel beams are removed from over the interstate.

Message boards, uniformed officers, traffic control devices, and smart work zone devices will be used to notify the traveling public. This work is expected to take three weeks to complete, however additional nights may be required due to weather conditions.

The bridge demolition work is part of the final I-93 mainline construction in the Exit 4 area (Derry/Londonderry), as well as the Exit 4 on and off ramp construction, the New Hampshire Route 102 reconstruction (including the reconstruction of the state Route 102 Bridge over I-93), and Pillsbury Road/Ash Street (including the Pillsbury Road/Ash Street Bridge over I-93).

The $62.2 million project is slated for completion in the fall of 2020.

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