The Route 8 (South Franklin Street) bridge in Titusville is now open following a bridge rehabilitation project.
Final milling and paving of the roadway approaches near the bridge will be completed next week.
Motorists should expect to encounter lane restrictions and traffic controlled by flaggers.
Meanwhile, the Rockdale Road bridge in Scrubgrass Township, Venango County, will be closed starting today.
The closure is necessary to complete a bridge rehabilitation project and is expected to be in place for 20 days.
A detour will be posted using Indian Rocks Road, Route 208 and Stone Church Road.