The transit agency is also offering free shuttle trains that circle the Loop and alternative bus service to provide options for people affected by the bridge closing.
A half-million-pound bridge replacement leaf that was floated up the river by barge is scheduled to be installed starting Tuesday. Workers will then bolt the span into place and rebuild tracks in time for the morning commute Monday.
CTA service on the bridge will be suspended again from April 26 through May 5, when the northern half of the bridge will be replaced, marking the end of the $41.2 million project, according to the Chicago Department of Transportation.
Tribune reporter Patrick Svitek and RedEye reporter Tracy Swartz contributed.