Is 55 S over Plattin CR
FairJefferson County, Missouri · S 1915 T 40 N R 6 E · Structure no. 1905
- Built
- 1969
- 56 years old
- Condition
- Fair
- inspected November 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 232 ft
- 3 main spans
- Daily traffic
- 16,629
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
Is 55 S over Plattin CR is a steel continuous stringer/multi-beam or girder carrying Is 55 S over Plattin 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 16,629 vehicles a day, roughly 22% of them trucks, projected to reach 30,764 by 2044. The structure is 232 ft (70.7 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Is 55 S over Plattin CR built?
It was built in 1969, making it 56 years old in 2025.
What condition is Is 55 S over Plattin 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 Plattin CR carry?
About 16,629 vehicles per day (2024 count), of which roughly 22% are trucks.
How long is Is 55 S over Plattin CR?
The structure is 232 ft (70.7 m) long with a longest span of 90 ft (27.4 m) and a deck 41 ft wide.
Who owns Is 55 S over Plattin CR?
It is owned by the State Highway Agency.