UPDATED 5.19.26: The closures on Interstate 55/70 in St. Clair County previously scheduled to begin May 18 have been rescheduled for Monday, June 1, due to weather and anticipated Memorial Day travel.
Traffic impacts and project details remain unchanged.
MADISON – The Illinois Department of Transportation is continuing multiple coordinated improvements along the Interstate 55/70 corridor in St. Clair County to improve safety, mobility and road conditions.
Beginning Monday, May 18 June 1, lane closures will be in place at the following locations to allow for pavement and structure repairs.
Eastbound I-55/70
Between Exchange Avenue and Black Lane, traffic will be reduced to:
• Two lanes during peak hours (approximately 4 p.m. to 6 p.m.)
• One or two lanes during off-peak hours, as needed
Westbound I-55/70
Between Illinois 203 and I-255, traffic will be reduced to:
• Two lanes during peak hours (approximately 6 a.m. to 8 a.m.)
• One or two lanes during off-peak hours, as needed
Ramp Closure
Beginning Monday, May 18 June 1, the southbound I-255 to westbound I-55/70 ramp will be reduced to one lane.
These closures are required to complete pavement and structure repairs and will be in place through summer 2027, weather permitting. Additional traffic impacts will be announced in advance as work progresses.
Motorists should expect long delays and are encouraged to use alternate routes during this closure. Drivers are urged to reduce speed, be alert for changing conditions, obey all construction signage, and refrain from using mobile devices while approaching and traveling through the work zone.
For IDOT District 8 updates, follow us on the social media platform X at @IDOTDistrict8 or view area construction details on IDOT’s traveler information map on GettingAroundIllinois.com.
