Route 1 at the Wiscasset end of the Donald Davies Bridge will be closed overnight from Sept. 24 to 25 to allow upgrades to the railroad crossing.
Southbound and northbound traffic will be detoured to Route 218 and Sheepscot Road from 9 p.m. Sept. 24 to 5 a.m. Sept. 25, according to the Maine Department of Transportation.
The closure comes as part of a controversial, $5 million project to address traffic bottlenecks on Route 1 — Main Street — in Wiscasset.
During the weeks of Sept. 17 and Sept. 24, other work will include placing gravel and grading sidewalks, fine grading and paving the end of Water Street and the final strip in a parking area, and placing the remainder of the curb in the parking lot area.
All scheduling is weather dependent and subject to change.
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Correction: An earlier version of this report implied that the highway would be closed during the day on Sept. 24. The closure and detour will begin at 9 p.m. Sept. 24.