Lane closures on I-55/70 in St. Clair County begin May 18

MADISON - The Illinois Department of Transportation is continuing multiple coordinated improvements along the I-55/70 corridor in St. Clair County to improve safety, mobility and road conditions.
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​Beginning Monday, May 18, lane closures will be in place at the following locations to allow for pavement and structure repairs.
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​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
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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, the southbound I-255 to westbound I-55/70 ramp will be reduced to one lane.
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​These lane 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.
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​Motorists should expect significant delays, particularly during peak travel periods, and are encouraged to use alternate routes when possible. Drivers are reminded to slow down, remain alert for changing conditions, obey all construction signage, and avoid distractions in work zones.

Over the next six years, IDOT is planning to improve 7,107 lane miles of highway and 8.4 million square feet of bridge deck as part of Rebuild Illinois, which is investing $33.2 billion into all modes of transportation. Accomplishments through Year Six of Rebuild Illinois include almost $20.8 billion of improvements statewide to 21,309 lane miles of highway, 815 bridges and 1,181 additional safety improvements.

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.

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