US Bridges

Exchange Avenue over I-55/70

Good

St. Clair County, Illinois · E ST L at Bowman Yd · Structure no. 082037800000000

Built
2011
14 years old
Condition
Good
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
302 ft
2 main spans
Daily traffic
1,225
2023 count
Owner
State
State Highway Agency

About this bridge

Exchange Avenue over I-55/70 is a steel continuous stringer/multi-beam or girder carrying Exchange Avenue over I-55/70 in St. Clair County, Illinois. It was built in 2011, so it is 14 years old, younger than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,225 vehicles a day, roughly 14% of them trucks, projected to reach 1,263 by 2046. The structure is 302 ft (92 m) long and 44 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesExchange Avenue
CrossesI-55/70
LocationE ST L at Bowman Yd
CountySt. Clair County
StateIllinois
Coordinates38.6342, -90.14044
Functional classUrban Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating81.5 US tons
Inventory rating48.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 25 or greater
Structure length302 ft (92 m)
Longest span163 ft (49.7 m)
Deck width44 ft (13.3 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,225 (2023)
Projected traffic1,263 by 2046
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Exchange Avenue over I-55/70 built?

It was built in 2011, making it 14 years old in 2025.

What condition is Exchange Avenue over I-55/70 in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2023.

How much traffic does Exchange Avenue over I-55/70 carry?

About 1,225 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is Exchange Avenue over I-55/70?

The structure is 302 ft (92 m) long with a longest span of 163 ft (49.7 m) and a deck 44 ft wide.

Who owns Exchange Avenue over I-55/70?

It is owned by the State Highway Agency.