I-55/64; US 40 Psc over Trra
PoorSt. Clair County, Illinois · P6(PSB) to Pier BC1 · Structure no. 082000500000000
- Built
- 1966
- 59 years old, rebuilt 1991
- Condition
- Poor
- inspected February 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 856 ft
- 6 main spans
- Daily traffic
- 113,200
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
I-55/64; US 40 Psc over Trra is a steel continuous stringer/multi-beam or girder carrying I-55/64; US 40 Psc over Trra in St. Clair County, Illinois. It was built in 1966 and reconstructed in 1991, so it is 59 years old, older than the Illinois average of 45.3 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
It carries about 113,200 vehicles a day, roughly 13% of them trucks, projected to reach 118,877 by 2046. The structure is 856 ft (260.9 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 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I-55/64; US 40 Psc over Trra built?
It was built in 1966, making it 59 years old in 2025. It was reconstructed in 1991.
What condition is I-55/64; US 40 Psc over Trra in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in February 2023.
How much traffic does I-55/64; US 40 Psc over Trra carry?
About 113,200 vehicles per day (2024 count), of which roughly 13% are trucks.
How long is I-55/64; US 40 Psc over Trra?
The structure is 856 ft (260.9 m) long with a longest span of 161 ft (49.1 m) and a deck 113 ft wide.
Who owns I-55/64; US 40 Psc over Trra?
It is owned by the State Highway Agency.