Is 270 W over Rt Ab
FairSt. Louis County, Missouri · S 10 T 45 N R 5 E · Structure no. 849
- Built
- 1964
- 61 years old, rebuilt 2023
- Condition
- Fair
- inspected October 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 172 ft
- 3 main spans
- Daily traffic
- 108,469
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
Is 270 W over Rt Ab is a steel continuous stringer/multi-beam or girder carrying Is 270 W over Rt Ab in St. Louis County, Missouri. It was built in 1964 and reconstructed in 2023, so it is 61 years old, older than the Missouri average of 45.1 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 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 108,469 vehicles a day, roughly 12% of them trucks, projected to reach 135,586 by 2044. The structure is 172 ft (52.4 m) long and 65 ft wide. If it were closed, the detour would be 0.6 mi (1 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Is 270 W over Rt Ab built?
It was built in 1964, making it 61 years old in 2025. It was reconstructed in 2023.
What condition is Is 270 W over Rt Ab 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 Is 270 W over Rt Ab carry?
About 108,469 vehicles per day (2024 count), of which roughly 12% are trucks.
How long is Is 270 W over Rt Ab?
The structure is 172 ft (52.4 m) long with a longest span of 76 ft (23.2 m) and a deck 65 ft wide.
Who owns Is 270 W over Rt Ab?
It is owned by the State Highway Agency.