The Brandon Road bridge now is expected to reopen Friday.
The tentative reopening date was pushed back last week when repairs could not be completed, Illinois Department of Transportation spokesman Guy Tridgell said. The bridge had been slated to open by the end of last week.
Tridgell said the new reopening date on Friday depends on how weather may hinder efforts to complete repairs.
The drawbridge over the Des Plaines River has been closed since Sept. 14 because of a sensor failure in the center lock system.
The center lock has failed repeatedly since 2016. IDOT has tentative plans to replace the entire system in 2020. The project is in the design phase.
The center lock connects the two ends of the drawbridge when it is lowered and releases them when it is raised.
The bridge is one of six drawbridges over the Des Plaines River in the Joliet area. The other five are in downtown Joliet. The Brandon Road bridge is outside the city in the area of the Brandon Road Lock and Dam.