Is 55 S over Cst Koeln Ave
FairSt. Louis city, Missouri · S 18 T 44 N R 7 E · Structure no. 866
- Built
- 1963
- 62 years old, rebuilt 1986
- Condition
- Fair
- inspected August 2023
- Type
- Slab
- Concrete Continuous
- Length
- 171 ft
- 3 main spans
- Daily traffic
- 88,981
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
Is 55 S over Cst Koeln Ave is a concrete continuous slab carrying Is 55 S over Cst Koeln Ave in St. Louis city, Missouri. It was built in 1963 and reconstructed in 1986, so it is 62 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 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 88,981 vehicles a day, roughly 12% of them trucks, projected to reach 111,226 by 2044. The structure is 171 ft (52.1 m) long and 146 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 | 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. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Is 55 S over Cst Koeln Ave built?
It was built in 1963, making it 62 years old in 2025. It was reconstructed in 1986.
What condition is Is 55 S over Cst Koeln Ave 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 August 2023.
How much traffic does Is 55 S over Cst Koeln Ave carry?
About 88,981 vehicles per day (2024 count), of which roughly 12% are trucks.
How long is Is 55 S over Cst Koeln Ave?
The structure is 171 ft (52.1 m) long with a longest span of 67 ft (20.4 m) and a deck 146 ft wide.
Who owns Is 55 S over Cst Koeln Ave?
It is owned by the State Highway Agency.