US231 SR75 over Mill Bayou
FairBay County, Florida · 3.3 Miles North of US98 · Structure no. 460026
- Built
- 1951
- 74 years old, rebuilt 1970
- Condition
- Fair
- inspected January 2025
- Type
- Slab
- Concrete
- Length
- 125 ft
- 5 main spans
- Daily traffic
- 34,000
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
US231 SR75 over Mill Bayou is a concrete slab carrying US231 SR75 over Mill Bayou in Bay County, Florida. It was built in 1951 and reconstructed in 1970, so it is 74 years old, older than the Florida average of 41.3 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 34,000 vehicles a day, roughly 11% of them trucks, projected to reach 58,990 by 2044. The structure is 125 ft (38.1 m) long and 83 ft wide. If it were closed, the detour would be 9.9 mi (16 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US231 SR75 over Mill Bayou built?
It was built in 1951, making it 74 years old in 2025. It was reconstructed in 1970.
What condition is US231 SR75 over Mill Bayou 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 January 2025.
How much traffic does US231 SR75 over Mill Bayou carry?
About 34,000 vehicles per day (2022 count), of which roughly 11% are trucks.
How long is US231 SR75 over Mill Bayou?
The structure is 125 ft (38.1 m) long with a longest span of 25 ft (7.6 m) and a deck 83 ft wide.
Who owns US231 SR75 over Mill Bayou?
It is owned by the State Highway Agency.