Is 55 N over Portage Byu
FairPemiscot County, Missouri · S 31 T 21 N R 13 E · Structure no. 1663
- Built
- 1966
- 59 years old, rebuilt 2005
- Condition
- Fair
- inspected November 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 228 ft
- 4 main spans
- Daily traffic
- 8,462
- 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 Pemiscot 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 8,462 vehicles a day, roughly 55% of them trucks, projected to reach 15,655 by 2044. The structure is 228 ft (69.5 m) long and 35 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 | 8 Very Good | No problems noted. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
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 November 2024.
How much traffic does Is 55 N over Portage Byu carry?
About 8,462 vehicles per day (2024 count), of which roughly 55% are trucks.
How long is Is 55 N over Portage Byu?
The structure is 228 ft (69.5 m) long with a longest span of 64 ft (19.5 m) and a deck 35 ft wide.
Who owns Is 55 N over Portage Byu?
It is owned by the State Highway Agency.