BL 55 (OLD US 66)
Carrying BL 55 (OLD US 66) over I-55
BL 55 INT-SW LINCOLN, Logan, Illinois
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
BL 55 (OLD US 66) in Logan, Illinois sits above 93% of rated Illinois bridges on inventory load rating (52 t), while its 1973 build year is earlier than 56% of Logan's recorded-year cohort (292 bridges).
BL 55 (OLD US 66) in Logan, Illinois is rated Poor in the FHWA's 2024 National Bridge Inventory. Built in 1973, it carries 3 rated components on the inspecting agency's 0-9 scale, and its weakest reported component scores 4. The lowest applicable rating sets the federal condition category, so this Poor 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:054004000000000
INTERSTATE-ERA · STEEL · MULTI-SPAN · SUPER-LED · LOCAL-ADT · HEAVY-LOAD · CAT-POOR
- INTERSTATE-ERA 1950–1979
- STEEL Steel
- MULTI-SPAN 2 spans
- SUPER-LED Superstructure-led
- LOCAL-ADT Local ADT
- HEAVY-LOAD Heavy load
- CAT-POOR Poor
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: BL 55 (OLD US 66)
The BL 55 (OLD US 66) bridge in Logan, Illinois carries BL 55 (OLD US 66) over I-55. It was built in 1973, making it 53 years old today. The structure is built primarily of steel continuous and spans 2 sections, stretching 81.9 meters (269 feet) end to end. Daily traffic averages 500 vehicles, placing it in the lower-traffic tier of Illinois bridges. It is owned and maintained by State Highway Agency.
The latest FHWA inspection records show a deck rating of 6/9, superstructure at 4/9, substructure at 6/9. The weakest component sits in poor condition. Because at least one major component scores 4 or lower, this bridge falls in FHWA's Poor condition category. That category is not a closure order.
How BL 55 (OLD US 66) compares
Age against the county: built in 1973, earlier than 164 of Logan's 292 bridges with a recorded construction year (56%), against a county median build year of 1974. Age is not a defect on its own, but it is the population from which future Poor ratings are drawn.
Live comparison across Illinois bridges with a recorded inventory load rating (26,904 of 26,928 rated).
BL 55 (OLD US 66) vs every rated Illinois bridge
Inventory load rating (metric tons), FHWA NBI, this state
52 Top 7% higher than 93% 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.
Logan inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 292 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
- 1973
- Material
- Steel Continuous
- Number of Spans
- 2
- Structure Length
- 81.9 m (269 ft)
- Deck Width
- 23.5 m (77 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 500 vehicles/day
- Structure Number
- 054004000000000
Condition Analysis
- • The deck (driving surface) is in fair condition (6/9), with minor deterioration that may require routine maintenance.
- • The superstructure (beams and supports above the deck) is in poor condition (4/9), showing advanced deterioration on the inspecting agency's 0-9 scale.
- • The substructure (piers and abutments) is in fair condition (6/9), with minor deterioration that may require routine maintenance.
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗How to read this record
BL 55 (OLD US 66) is in the federal Poor condition category. That is a component-based result, not a closure order.
- NBI condition ratings reflect the latest record in this annual dataset, not a live status. Current routine inspection intervals are risk-based.
- Understand what Poor condition does and does not mean before drawing conclusions. Poor condition explained
- Compare BL 55 (OLD US 66) against other structures in Logan 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 BL 55 (OLD US 66)?
BL 55 (OLD US 66) in Logan, Illinois has a deck rating of 6/9, superstructure rating of 4/9, and substructure rating of 6/9 on the FHWA's 0–9 scale.
How often is BL 55 (OLD US 66) inspected?
BL 55 (OLD US 66)'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 500 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. BL 55 (OLD US 66) is currently shown as Poor condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for BL 55 (OLD US 66)?
BL 55 (OLD US 66) has an NBI inventory load rating of 51.8 metric tons.
Who is responsible for maintaining BL 55 (OLD US 66)?
BL 55 (OLD US 66) is owned and maintained by State Highway Agency.
How old is BL 55 (OLD US 66) and does age affect safety?
BL 55 (OLD US 66) was built in 1973, making it 53 years old.
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.
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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.