Or 55 S over Isle Du Bois CR
FairJefferson County, Missouri · S 2078 T 39 N R 7 E · Structure no. 1741
- Built
- 1969
- 56 years old
- Condition
- Fair
- inspected November 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 138 ft
- 3 main spans
- Daily traffic
- 31
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
Or 55 S over Isle Du Bois CR is a steel continuous stringer/multi-beam or girder carrying Or 55 S over Isle Du Bois CR in Jefferson County, Missouri. It was built in 1969, so it is 56 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 31 vehicles a day, roughly 13% of them trucks, projected to reach 56 by 2044. The structure is 138 ft (42.1 m) long and 31 ft wide. If it were closed, the detour would be 1.9 mi (3 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 Or 55 S over Isle Du Bois CR built?
It was built in 1969, making it 56 years old in 2025.
What condition is Or 55 S over Isle Du Bois CR 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 November 2024.
How much traffic does Or 55 S over Isle Du Bois CR carry?
About 31 vehicles per day (2024 count), of which roughly 13% are trucks.
How long is Or 55 S over Isle Du Bois CR?
The structure is 138 ft (42.1 m) long with a longest span of 54 ft (16.5 m) and a deck 31 ft wide.
Who owns Or 55 S over Isle Du Bois CR?
It is owned by the State Highway Agency.