US231 SR75
Carrying US231 SR75 over Mill Bayou
3.3 Miles North of US98, Bay, Florida
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: US231 SR75
The US231 SR75 bridge in Bay, Florida carries US231 SR75 over Mill Bayou. It was built in 1951, making it 75 years old today. It was last reconstructed in 1970, extending its service life. The structure is built primarily of concrete and spans 5 sections, stretching 38.1 meters (125 feet) end to end. Daily traffic averages 34,000 vehicles, placing it in the heavily-trafficked tier of Florida bridges. It is owned and maintained by State Highway Agency.
The latest FHWA inspection records show a deck rating of 6/9, superstructure at 6/9, substructure at 6/9. The weakest component sits in fair condition. All reported major components score above the Poor range. Its NBI inventory load rating is 37.4 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How US231 SR75 compares
Live comparison across Florida.
Historical Sufficiency Rating
PlainBridge-computedFHWA discontinued this calculated item; it does not determine current condition, funding eligibility, posting, or closure. How the historical reference is calculated.
Condition Ratings
Full 0–9 scale + sufficiency-rating breakdown: how condition ratings work.
Structural Details
- Year Built
- 1951
- Last Reconstructed
- 1970
- Material
- Concrete
- Number of Spans
- 5
- Structure Length
- 38.1 m (125 ft)
- Deck Width
- 25.3 m (83 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 34,000 vehicles/day
- Structure Number
- 460026
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • The deck (driving surface) rates fair at 6/9, minor deterioration that routine maintenance should address.
- • The superstructure (beams and supports above the deck) rates fair at 6/9, minor deterioration that routine maintenance should address.
- • The substructure (piers and abutments) is in fair condition (6/9), with minor deterioration that may require routine maintenance.
How to read this record
This page shows what the last federal inspection recorded, not whether US231 SR75 is safe to cross today. Here is how to use it.
- NBI condition ratings reflect the latest record in this annual dataset, not a live status. Current routine inspection intervals are risk-based.
- Learn how the 0–9 condition scale and Good/Fair/Poor categories are defined. How condition ratings work
- Compare US231 SR75 against other structures in Bay and across Florida. Florida bridges
- Noticed visible damage or a safety concern? Report it to the agency that owns the bridge, or call 911 in an emergency. How to report a bridge
Condition codes come straight from the FHWA National Bridge Inventory and are not a real-time safety judgment. Only the owning agency, a state DOT, county, or other owner, can post, restrict, or close a bridge.
Frequently Asked Questions
What do the condition ratings mean for US231 SR75?
US231 SR75 in Bay, Florida has a deck rating of 6/9, superstructure rating of 6/9, and substructure rating of 6/9 on the FHWA's 0–9 scale.
How often is US231 SR75 inspected?
US231 SR75's responsible agency sets its routine interval under FHWA's risk-based inspection rules; this page does not expose the scheduled interval. It carries about 34,000 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. US231 SR75 is currently shown as Fair condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for US231 SR75?
US231 SR75 has an NBI inventory load rating of 37.4 metric tons.
Who is responsible for maintaining US231 SR75?
US231 SR75 is owned and maintained by State Highway Agency.
How old is US231 SR75 and does age affect safety?
US231 SR75 was built in 1951, making it 75 years old and last reconstructed in 1970.
Disclaimer: Bridge condition data is from the FHWA NBI and reflects the last reported inspection. A Poor condition rating is not a live declaration that a bridge is closed or unsafe for travel. For current closure, posting, or safety information, contact the responsible transportation agency.
Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.