PORTLAND/SOUTH PORTLAND - The Maine Department of Transportation will be performing maintenance work on the Casco Bay Bridge next week. This work will require a traffic restriction on the bridge. Vehicles weighing more than 25 tons (50,000 pounds) will not be permitted to cross the bridge from Monday, July 10th through Thursday, July 13th. This restriction will be in place around the clock on these days. MaineDOT will also use message boards to alert drivers of the temporary weight restriction. Like all outside construction work, this schedule is weather-dependent.