Construction on the bridge connecting Milford and Old Town began Wednesday.
Crews will be resetting the curbs, repairing concrete joint headers, replacing joint seals, milling the surface, repaving and making sidewalks more compliant with the Americans With Disabilities Act, according to the Maine Department of Transportation.
During the construction, there will be two lanes of two-way traffic, although there may be temporary delays.
That work is expected to run until the end of June.
The $990,000 contract was awarded to BMB Construction LLC of Holden.
