A bridge over the Monocacy River in southern Frederick County has been closed for emergency road work, according to the State Highway Administration.
Beginning at 10 a.m. Tuesday, crews closed both lanes of the bridge on Md. 28 in order to repair drainage grates, according to an SHA release.
There is no estimated time for the work to be finished.
A detour will use Md. 109, Md. 355, Md. 80 and Md. 85, and drivers are encouraged to allow extra travel time during the work.
The $8.4 million rehabilitation project on the bridge began in 2018, and is expected to finish by the fall.
Md. 28 runs from Point of Rocks into Montgomery County through the communities of Dickerson and Darnestown to Rockville.
The section of Md. 28 with the bridge is used by about 9,300 vehicles per day.
The bridge, built in 1931, was deemed structurally deficient in 2015 because of the condition of its deck, although the bridge itself was structurally sound.
The bridge was reopened around 3 p.m. Tuesday.