The closing of the Charleroi-Monessen bridge isn’t the only aggravation motorists will face in crossing the Monongahela River.

Beginning Tuesday, restrictions will be in place on another bridge that is part of a PennDOT-posted detour.

Traffic on the Donora-Monessen Bridge will be restricted to a single lane in each direction, with occasional alternating traffic by flaggers.

The restrictions will be in place for a $19.9 million project that includes replacing the concrete deck, painting, drainage and repairs, and will continue for two construction seasons.

The bridge, which was built in the 1970s, carries Route 1077 across the Monongahela between Rostraver and Donora.

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