Is 55 N over Unknown RR
GoodJefferson County, Missouri · S 1916 T 40 N R 6 E · Structure no. 1903
- Built
- 1969
- 56 years old
- Condition
- Good
- inspected November 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 192 ft
- 3 main spans
- Daily traffic
- 15,224
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
Is 55 N over Unknown RR is a steel continuous stringer/multi-beam or girder carrying Is 55 N over Unknown RR 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 15,224 vehicles a day, roughly 27% of them trucks, projected to reach 28,164 by 2044. The structure is 192 ft (58.5 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
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 8 Very Good | No problems noted. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Is 55 N over Unknown RR built?
It was built in 1969, making it 56 years old in 2025.
What condition is Is 55 N over Unknown RR in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in November 2024.
How much traffic does Is 55 N over Unknown RR carry?
About 15,224 vehicles per day (2024 count), of which roughly 27% are trucks.
How long is Is 55 N over Unknown RR?
The structure is 192 ft (58.5 m) long with a longest span of 73 ft (22.3 m) and a deck 41 ft wide.
Who owns Is 55 N over Unknown RR?
It is owned by the State Highway Agency.