More than a dozen highway projects planned in St. Clair County through 2028

The Illinois Department of Transportation announced Friday that St. Clair County has more than a dozen ongoing or upcoming construction projects planned on state-maintained roads, including work expected to extend through 2028.

The projects include adding lanes on Interstate 64 in O’Fallon, expanding Air Mobility Drive near Mascoutah and a nine-day closure of westbound I-64 later this summer.

“Because of the work we’ve done in the General Assembly, IDOT is investing nearly $850 million in the metro-east — and that’s just on projects that are currently running,” Assistant House Majority Leader Jay Hoffman said in a statement. “That number alone cannot quantify the positive impact on families, communities and union labor involved with getting these projects out the door.”

The metro-east construction is part of the statewide Rebuild Illinois program, passed in 2019 to address a backlog of deferred maintenance on state roads.

The $44.8 billion program is the first multiyear capital plan for Illinois since 2009, aimed at improving infrastructure in every county in the state. The program began in 2020 as a six-year effort, but Illinois Department of Transportation spokesperson Paul Wappel said it’s a revolving program with current projects expected to continue through 2028.

The Rebuild Illinois projects in St. Clair County are expected to cost nearly $345 million.

Here’s what you can expect on St. Clair County roads:

Ongoing projects

Air Mobility Drive expansion near Mascoutah

What/where: A $20 million project to build a new stretch of road between Illinois routes 161 and 158/177 near Mascoutah.

Timeline: Expected to finish this fall.

Traffic: Drivers can expect lane restrictions along Route 161 until construction is complete, the department said.

IDOT spokesperson Dawn Johnson said the department broke ground on the project in 2024 but did not start construction until last year.

Interstate 64 widening in O’Fallon

What/where: A stretch of I-64 from Green Mount Road to about 1 mile west of Illinois Route 158.

Cost/work: $72.4 million for added lanes, resurfacing and bridge repairs.

Timeline: Intermittent lane closures through summer 2027.

Traffic: Intermittent lane closures.

Johnson said the added lanes are intended to increase capacity in a high-traffic area.

Lighting upgrades on Interstate 55/70 in East St. Louis

What/where: Interstate 55/70 between I-64 and Illinois Route 203.

Cost/work: Nearly $100 million for lighting upgrades, resurfacing and bridge repairs.

Timeline: Through summer 2028.

Traffic: One lane closed in each direction for the duration of the project.

Bridge repairs at Interstate 70 over Interstate 55/64 in East St. Louis

What/where: The Interstate 70 overpass above I-55/64 in East St. Louis.

Cost/work: $2 million in bridge repairs.

Timeline: Expected to wrap up this summer.

Traffic: The westbound I-64 ramp to westbound I-70 will be closed for 45 days, Johnson said.

Interstate 55/70 bridge repair in East St. Louis

What/where: A bridge over multiple railroads on I-55/70 in East St. Louis.

Cost/work: An estimated $36 million in repairs.

Timeline: Through summer 2028.

Traffic: Drivers should expect lane closures, Johnson said.

Resurfacing and bridge repairs on Interstate 64 in Fairview Heights

What/where: Interstate 64 between Illinois Route 157 and Green Mount Road in Fairview Heights.

Cost/work: $76.9 million for milling, resurfacing and bridge repairs.

Timeline: Expected to finish this fall.

Traffic: Lane closures expected, according to the department.

Upcoming projects

Nine-day westbound I-64 closure near Washington Park

What/where: Westbound I-64 between I-55 and I-255.

Cost/work: $1.65 million in bridge deck repairs and surface patching.

Timeline: Nine-day closure this summer.

Traffic: Westbound I-64 closed for nine days; overnight lane and ramp closures also expected.

I-55/64 repairs on arterial bridges in Sauget

What/where: Three mainline bridges connecting Sauget to St. Louis on I-55/64.

Cost/work: A $550,000 contract and a nearly $2 million contract for bridge deck repairs and an overlay.

Timeline: Late fall.

Traffic: Reduced to two lanes during construction.

Bridge replacement near World Wide Technology Raceway

What/where: Illinois Route 203 near World Wide Technology Raceway.

Cost/work: Two-year, $13.8 million bridge replacement.

Timeline: Work begins this summer and is expected to wrap up in summer 2028.

Traffic: Reduced to one lane in each direction during construction.

I-64 bridge repairs near MidAmerica St. Louis Airport

What/where: I-64 between Illinois routes 158 and 4.

Cost/work: $10 million in bridge repairs.

Timeline: Work starts this fall and is expected to be completed next summer.

Traffic: Reduced to one lane in each direction.

Illinois Route 159 resurfacing in Fairview Heights

What/where: Illinois Route 159 from Fountains Parkway to north of Lincoln Trail.

Cost/work: $3.5 million for milling and resurfacing.

Timeline: Late fall.

Traffic: Lane closures with flaggers at night and on weekends expected, the department said.

Illinois Route 177 resurfacing in Mascoutah

What/where: Illinois Route 177 from County Road to Mine Road in Mascoutah.

Cost/work: $835,000 for resurfacing.

Timeline: Later this summer.

Traffic: Daily lane closures with flaggers expected during construction.

Illinois Route 160 resurfacing north of New Baden

What/where: Illinois Route 160 from Wesclin Road to the north city limits of New Baden.

Cost/work: $5.2 million for resurfacing.

Timeline: This fall.

Traffic: Daily lane closures with flaggers expected.