MOORHEAD - The underpass project at the intersection of Main Avenue and 21st Street South in Moorhead will continue until about December, at which point major construction will stop for the winter.

At a Moorhead Business Association meeting Tuesday, Oct. 10, Tom Trowbridge, assistant Moorhead city engineer, outlined the project's progress and provided a timeline for construction following a winter break.

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"The public won't see as much happening," Trowbridge said about construction during the cold months.

Trowbridge said retaining walls for the underpass and a stormwater pumping station are expected to be completed by November .

Larger construction, like excavation or paving, will stop about Dec. 15, because it isn't cost-effective to continue work with frost settling into the ground, Trowbridge said.

Starting Monday, Oct. 15, the Main Avenue and 21st Street South intersection will close until construction of the underpass is completed, Trowbridge said.

As a result, traffic will be detoured on Eighth Street South or 34th Street South via 12th Avenue South.

Barring any inclement weather in spring 2019, construction is expected to resume in March with the building of a temporary railroad track for trains going around the intersection, Trowbridge said.

Construction of the two northern parts of the project's railroad bridgework is expected to be completed by July 2019, with the south bridgework to be finished by the following September.

Also, a short section of First Avenue South that connects Main Avenue and 21st Street South will permanently close beginning in May 2019.

The entire project, with the permanent railroad alignment and roadway approaches into the underpass, is expected to completed by November 2019, Trowbridge said.