I 55 over Relief Slough
FairMadison County, Mississippi · 3.6 MI N SR 16 · Structure no. 11000550451268A
- Built
- 1969
- 56 years old
- Condition
- Fair
- inspected April 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 240 ft
- 6 main spans
- Daily traffic
- 10,000
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 55 over Relief Slough is a prestressed concrete stringer/multi-beam or girder carrying I 55 over Relief Slough in Madison County, Mississippi. It was built in 1969, so it is 56 years old, older than the Mississippi average of 38.9 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 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 10,000 vehicles a day, roughly 24% of them trucks, projected to reach 11,500 by 2043. The structure is 240 ft (73.2 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 8 Very Good | No problems noted. |
| 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 I 55 over Relief Slough built?
It was built in 1969, making it 56 years old in 2025.
What condition is I 55 over Relief Slough 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 April 2024.
How much traffic does I 55 over Relief Slough carry?
About 10,000 vehicles per day (2023 count), of which roughly 24% are trucks.
How long is I 55 over Relief Slough?
The structure is 240 ft (73.2 m) long with a longest span of 40 ft (12.2 m) and a deck 44 ft wide.
Who owns I 55 over Relief Slough?
It is owned by the State Highway Agency.