FAI 255 SB
Carrying FAI 255 SB over FAI 64
.75 MI SO BUNKUM RD, St. Clair, Illinois
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
FAI 255 SB in St. Clair, Illinois sits above 87% of rated Illinois bridges on inventory load rating (45 t), while its 1981 build year is earlier than 43% of St. Clair's recorded-year cohort (486 bridges).
FAI 255 SB in St. Clair, Illinois is rated Fair in the FHWA's 2024 National Bridge Inventory. Built in 1981, it carries 3 rated components on the inspecting agency's 0-9 scale, and its weakest reported component scores 6. The lowest applicable rating sets the federal condition category, so this Fair result describes the weakest reported component rather than the structure as a whole. No NBI category is a closure decision or a live crossing-safety verdict.
NBI record plate
Structure IL:082024200000000
LATE-CENTURY · STEEL · MULTI-SPAN · SUPER-LED · HEAVY-ADT · HEAVY-LOAD · CAT-FAIR
- LATE-CENTURY 1980–1999
- STEEL Steel
- MULTI-SPAN 3 spans
- SUPER-LED Superstructure-led
- HEAVY-ADT Heavy ADT
- HEAVY-LOAD Heavy load
- CAT-FAIR Fair
Inspection-sheet codes from this record’s year, material family, spans, controlling component, ADT, inventory load, and NBI category, not a live closure verdict.
Bridge Snapshot: FAI 255 SB
The FAI 255 SB bridge in St. Clair, Illinois carries FAI 255 SB over FAI 64. It was built in 1981, making it 45 years old today. It was last reconstructed in 2013, extending its service life. The structure is built primarily of steel continuous and spans 3 sections, stretching 110.9 meters (364 feet) end to end. Daily traffic averages 34,350 vehicles, placing it in the heavily-trafficked tier of Illinois bridges. It is owned and maintained by State Highway Agency.
The latest FHWA inspection records show a deck rating of 7/9, superstructure at 6/9, substructure at 7/9. The weakest component sits in fair condition. All reported major components score above the Poor range.
How FAI 255 SB compares
Age against the county: built in 1981, earlier than 211 of St. Clair's 486 bridges with a recorded construction year (43%), against a county median build year of 1979. This is one of the newer structures in its county.
Live comparison across Illinois bridges with a recorded inventory load rating (26,904 of 26,928 rated).
FAI 255 SB vs every rated Illinois bridge
Inventory load rating (metric tons), FHWA NBI, this state
45 Top 13% higher than 87% of 26,904 bridges
rated Illinois bridges, bucketed by value
Each bar is a band; taller bars hold more bridges. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source FHWA National Bridge Inventory · August 2026
Condition Ratings
Full 0–9 scale + sufficiency-rating breakdown: how condition ratings work.
Reported 0–9 component ratings from the FHWA NBI. The highlighted component is the lowest reported input to this record’s current condition category; it is not a closure or live crossing-safety decision.
St. Clair inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 486 bridges in this county. Orthogonal to this structure's component profile above: a county catalog share, not a live crossing-safety verdict.
Structural Details
- Year Built
- 1981
- Last Reconstructed
- 2013
- Material
- Steel Continuous
- Number of Spans
- 3
- Structure Length
- 110.9 m (364 ft)
- Deck Width
- 34.8 m (114 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 34,350 vehicles/day
- Structure Number
- 082024200000000
Condition Analysis
- • The deck (driving surface) is in good condition (7/9), showing no significant deterioration.
- • At 6/9, the superstructure (beams and supports above the deck) shows fair condition, with minor wear flagged for upkeep.
- • The substructure (piers and abutments) rates good at 7/9, with no significant deterioration on file.
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗How to read this record
This page shows what the last federal inspection recorded, not whether FAI 255 SB 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 FAI 255 SB against other structures in St. Clair and across Illinois. Illinois 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 FAI 255 SB?
FAI 255 SB in St. Clair, Illinois has a deck rating of 7/9, superstructure rating of 6/9, and substructure rating of 7/9 on the FHWA's 0–9 scale.
How often is FAI 255 SB inspected?
FAI 255 SB'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 34,350 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. FAI 255 SB 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 FAI 255 SB?
FAI 255 SB has an NBI inventory load rating of 45.4 metric tons.
Who is responsible for maintaining FAI 255 SB?
FAI 255 SB is owned and maintained by State Highway Agency.
How old is FAI 255 SB and does age affect safety?
FAI 255 SB was built in 1981, making it 45 years old and last reconstructed in 2013.
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.
Share this inspection record
Send this source-bounded record or download its data card. An NBI condition category is not a closure or live crossing-safety verdict.
Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. Component ratings, ADT, and condition category on this page are copied from the NBI record for this structure; no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2024 NBI release. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.