I0055 over Off Ramp US 51 Manchac
GoodTangipahoa Parish, Louisiana · 9.9 M S of LA 22 · Structure no. 625304529001318
- Built
- 1979
- 46 years old
- Condition
- Good
- inspected January 2025
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 560 ft
- 8 main spans
- Daily traffic
- 8,115
- 2021 count
- Owner
- State
- State Highway Agency
About this bridge
I0055 over Off Ramp US 51 Manchac is a prestressed concrete stringer/multi-beam or girder carrying I0055 over Off Ramp US 51 Manchac in Tangipahoa Parish, Louisiana. It was built in 1979, so it is 46 years old, older than the Louisiana average of 43 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 8,115 vehicles a day, roughly 25% of them trucks, projected to reach 8,926 by 2041. The structure is 560 ft (170.7 m) long and 29 ft wide. If it were closed, the detour would be 98.8 mi (159 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 | 7 Good | Some minor problems. |
| Substructure | 8 Very Good | No problems noted. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I0055 over Off Ramp US 51 Manchac built?
It was built in 1979, making it 46 years old in 2025.
What condition is I0055 over Off Ramp US 51 Manchac 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 January 2025.
How much traffic does I0055 over Off Ramp US 51 Manchac carry?
About 8,115 vehicles per day (2021 count), of which roughly 25% are trucks.
How long is I0055 over Off Ramp US 51 Manchac?
The structure is 560 ft (170.7 m) long with a longest span of 70 ft (21.3 m) and a deck 29 ft wide.
Who owns I0055 over Off Ramp US 51 Manchac?
It is owned by the State Highway Agency.