The interchange of Interstate 90 and Route 18 (Exit 9 for Girard/Platea) will be closed starting June 13, weather-permitting, the Pennsylvania Department of Transportation (PennDOT) announced Friday.

All on and off ramps for the interstate and Route 18 bridge will be closed, so workers can tie the roadway into the new structure and the ramps into the newly constructed roundabouts.

A detour for Route 18 using Routes 20, 6N and 98 is posted. Large vehicle drivers are reminded to follow detour signs and follow weight limits and height restrictions.

The ramps will be reopened as work allows, and the bridge is expected to open to Route 18 traffic in July.

As part of the work, Cross Station Road will be closed near the intersection with Route 18 as a new intersection is constructed. That is expected to happen later in June. A detour will be posted, and businesses and homes on Cross Station Rd. can be accessed from Mill St.

Due to the I-90 reconstruction project, eastbound traffic will be shifted and reduced to one lane from mile marker 3.5 to mile marker 10.5. That restriction is expected to remain in place through the fall.