Is 55 S over Isle Dubois CR
FairJefferson County, Missouri · S 2078 T 39 N R 7 E · Structure no. 1672
- Built
- 1970
- 55 years old, rebuilt 2009
- Condition
- Fair
- inspected November 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 206 ft
- 3 main spans
- Daily traffic
- 13,572
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
Is 55 S over Isle Dubois CR is a steel continuous stringer/multi-beam or girder carrying Is 55 S over Isle Dubois CR in Jefferson County, Missouri. It was built in 1970 and reconstructed in 2009, so it is 55 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 13,572 vehicles a day, roughly 30% of them trucks, projected to reach 25,108 by 2044. The structure is 206 ft (62.8 m) long and 41 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 | 7 Good | Some minor problems. |
| 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 Is 55 S over Isle Dubois CR built?
It was built in 1970, making it 55 years old in 2025. It was reconstructed in 2009.
What condition is Is 55 S over Isle Dubois 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 Is 55 S over Isle Dubois CR carry?
About 13,572 vehicles per day (2024 count), of which roughly 30% are trucks.
How long is Is 55 S over Isle Dubois CR?
The structure is 206 ft (62.8 m) long with a longest span of 80 ft (24.4 m) and a deck 41 ft wide.
Who owns Is 55 S over Isle Dubois CR?
It is owned by the State Highway Agency.