SR390 over Mill Bayou
PoorBay County, Florida · 1.2 Miles West of US231 · Structure no. 460020
- Built
- 1955
- 70 years old
- Condition
- Poor
- inspected September 2024
- Type
- Tee Beam
- Concrete
- Length
- 150 ft
- 6 main spans
- Daily traffic
- 9,100
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
SR390 over Mill Bayou is a concrete tee beam carrying SR390 over Mill Bayou in Bay County, Florida. It was built in 1955, so it is 70 years old, older than the Florida average of 41.3 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
It carries about 9,100 vehicles a day, roughly 11% of them trucks, projected to reach 15,788 by 2044. The structure is 150 ft (45.7 m) long and 29 ft wide. If it were closed, the detour would be 3.1 mi (5 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was SR390 over Mill Bayou built?
It was built in 1955, making it 70 years old in 2025.
What condition is SR390 over Mill Bayou in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in September 2024.
How much traffic does SR390 over Mill Bayou carry?
About 9,100 vehicles per day (2022 count), of which roughly 11% are trucks.
How long is SR390 over Mill Bayou?
The structure is 150 ft (45.7 m) long with a longest span of 25 ft (7.6 m) and a deck 29 ft wide.
Who owns SR390 over Mill Bayou?
It is owned by the State Highway Agency.