TR184 CARBON HILL
Carrying TR184 CARBON HILL over CLAYPOOL DRAIN DITCH
.55 MI S WHITETIE RD, Grundy, Illinois
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
TR184 CARBON HILL in Grundy, Illinois sits above 21% of rated Illinois bridges on inventory load rating (31 t), while its 1981 build year is earlier than 57% of Grundy's recorded-year cohort (269 bridges).
TR184 CARBON HILL in Grundy, Illinois is rated Poor 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 3. 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:032465600000000
LATE-CENTURY · CONCRETE · MULTI-SPAN · SUPER-LED · LOCAL-ADT · STANDARD-LOAD · CAT-POOR
- LATE-CENTURY 1980–1999
- CONCRETE Concrete
- MULTI-SPAN 2 spans
- SUPER-LED Superstructure-led
- LOCAL-ADT Local ADT
- STANDARD-LOAD Standard 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: TR184 CARBON HILL
The TR184 CARBON HILL bridge in Grundy, Illinois carries TR184 CARBON HILL over CLAYPOOL DRAIN DITCH. It was built in 1981, making it 45 years old today. The structure is built primarily of concrete and spans 2 sections, stretching 17.7 meters (58 feet) end to end. Daily traffic averages 425 vehicles, placing it in the lower-traffic tier of Illinois bridges. It is owned and maintained by Town/Township Highway Agency.
The latest FHWA inspection records show a deck rating of 6/9, superstructure at 3/9, substructure at 5/9. The weakest component sits in poor condition. A component scored 4 or below, placing this bridge in the federal Poor condition category rather than declaring it unsafe or closed.
How TR184 CARBON HILL compares
Age against the county: built in 1981, earlier than 153 of Grundy's 269 bridges with a recorded construction year (57%), against a county median build year of 1984. 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).
TR184 CARBON HILL vs every rated Illinois bridge
Inventory load rating (metric tons), FHWA NBI, this state
31 Top 79% higher than 21% 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.
Grundy inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 269 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
- Material
- Concrete
- Number of Spans
- 2
- Structure Length
- 17.7 m (58 ft)
- Deck Width
- 8.0 m (26 ft)
- Owner
- Town/Township Highway Agency
- Avg Daily Traffic
- 425 vehicles/day
- Structure Number
- 032465600000000
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) rates poor at 3/9, with advanced deterioration recorded on the latest inspection.
- • The substructure (piers and abutments) rates fair at 5/9, minor deterioration that routine maintenance should address.
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗How to read this record
TR184 CARBON HILL 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 TR184 CARBON HILL against other structures in Grundy 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 TR184 CARBON HILL?
TR184 CARBON HILL in Grundy, Illinois has a deck rating of 6/9, superstructure rating of 3/9, and substructure rating of 5/9 on the FHWA's 0–9 scale.
How often is TR184 CARBON HILL inspected?
TR184 CARBON HILL'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 425 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. TR184 CARBON HILL 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 TR184 CARBON HILL?
TR184 CARBON HILL has an NBI inventory load rating of 30.8 metric tons.
Who is responsible for maintaining TR184 CARBON HILL?
TR184 CARBON HILL is owned and maintained by Town/Township Highway Agency.
How old is TR184 CARBON HILL and does age affect safety?
TR184 CARBON HILL was built in 1981, making it 45 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.