Is 55 N over Portage Byu
FairNew Madrid County, Missouri · S 20 T 21 N R 13 E · Structure no. 1139
- Built
- 1966
- 59 years old, rebuilt 2005
- Condition
- Fair
- inspected December 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 147 ft
- 3 main spans
- Daily traffic
- 8,503
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
Is 55 N over Portage Byu is a steel continuous stringer/multi-beam or girder carrying Is 55 N over Portage Byu in New Madrid County, Missouri. It was built in 1966 and reconstructed in 2005, so it is 59 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 8,503 vehicles a day, roughly 62% of them trucks, projected to reach 15,731 by 2044. The structure is 147 ft (44.8 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 | 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 Is 55 N over Portage Byu built?
It was built in 1966, making it 59 years old in 2025. It was reconstructed in 2005.
What condition is Is 55 N over Portage Byu 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 December 2024.
How much traffic does Is 55 N over Portage Byu carry?
About 8,503 vehicles per day (2024 count), of which roughly 62% are trucks.
How long is Is 55 N over Portage Byu?
The structure is 147 ft (44.8 m) long with a longest span of 56 ft (17.1 m) and a deck 41 ft wide.
Who owns Is 55 N over Portage Byu?
It is owned by the State Highway Agency.