Part of South Three Notch Street will be closed to northbound traffic for the next several months as construction continues there.

“Starting Monday, we’ll be moving into Phase 4 for the project,” Daniel Wells of CDG Engineer said. “We will be closing the street to northbound traffic from Segar Street to the railroad tracks.

“With that, we’ll be setting up a northbound traffic detour that routes traffic from Snowden to Church Street. That’s for inbound traffic, from the bypass to the Square.”

There will be one lane of traffic, in the center of the street, for southbound travelers, or those travelling from the Square toward the bypass, he said.

Wells said the traffic changes are expected to be in place for about the next six months.

Work began the first week of November on the first phase of construction, which widened the street from Simmons Street to Railroad Avenue. This phase also included installation of a new sanitary sewerage line in the center of the street.

Another phase included widening on the southbound side of the street, but did not interrupt traffic.

The completed project is expected to take approximately a year.