US Bridges

I-55/64; US 40 EB over Missouri Avenue

Fair

St. Clair County, Illinois · 1/2 MI W 3rd ST Exit · Structure no. 082001200000000

Built
1965
60 years old, rebuilt 1993
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
151 ft
3 main spans
Daily traffic
52,650
2024 count
Owner
State
State Highway Agency

About this bridge

I-55/64; US 40 EB over Missouri Avenue is a steel continuous stringer/multi-beam or girder carrying I-55/64; US 40 EB over Missouri Avenue in St. Clair County, Illinois. It was built in 1965 and reconstructed in 1993, so it is 60 years old, older than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 52,650 vehicles a day, roughly 12% of them trucks, projected to reach 53,177 by 2046. The structure is 151 ft (46.1 m) long and 59 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-55/64; US 40 EB
CrossesMissouri Avenue
Location1/2 MI W 3rd ST Exit
RouteInterstate 55
CountySt. Clair County
StateIllinois
Coordinates38.62815, -90.16174
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74 US tons
Inventory rating39.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length151 ft (46.1 m)
Longest span67 ft (20.5 m)
Deck width59 ft (18 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic52,650 (2024)
Projected traffic53,177 by 2046
Trucks12%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-55/64; US 40 EB over Missouri Avenue built?

It was built in 1965, making it 60 years old in 2025. It was reconstructed in 1993.

What condition is I-55/64; US 40 EB over Missouri Avenue in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in May 2023.

How much traffic does I-55/64; US 40 EB over Missouri Avenue carry?

About 52,650 vehicles per day (2024 count), of which roughly 12% are trucks.

How long is I-55/64; US 40 EB over Missouri Avenue?

The structure is 151 ft (46.1 m) long with a longest span of 67 ft (20.5 m) and a deck 59 ft wide.

Who owns I-55/64; US 40 EB over Missouri Avenue?

It is owned by the State Highway Agency.