Psb I-55 64;US 40 over Mississippi River
FairSt. Clair County, Illinois · Poplar ST Br - Modot · Structure no. 082000400000000
- Built
- 1963
- 62 years old
- Condition
- Fair
- inspected October 2024
- Type
- Orthotropic
- Steel Continuous
- Length
- 2,165 ft
- 5 main spans
- Daily traffic
- 113,200
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
Psb I-55 64;US 40 over Mississippi River is a steel continuous orthotropic carrying Psb I-55 64;US 40 over Mississippi River in St. Clair County, Illinois. It was built in 1963, so it is 62 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 113,200 vehicles a day, roughly 13% of them trucks, projected to reach 118,877 by 2046. The structure is 2,165 ft (659.9 m) long and 113 ft wide. If it were closed, the detour would be 13 mi (21 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Psb I-55 64;US 40 over Mississippi River built?
It was built in 1963, making it 62 years old in 2025.
What condition is Psb I-55 64;US 40 over Mississippi River 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 October 2024.
How much traffic does Psb I-55 64;US 40 over Mississippi River carry?
About 113,200 vehicles per day (2024 count), of which roughly 13% are trucks.
How long is Psb I-55 64;US 40 over Mississippi River?
The structure is 2,165 ft (659.9 m) long with a longest span of 600 ft (182.9 m) and a deck 113 ft wide.
Who owns Psb I-55 64;US 40 over Mississippi River?
It is owned by the State Highway Agency.