TR 351
Carrying TR 351 over CAHOKIA CR
4.5 NE EAGERVILLE, Macoupin, Illinois
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
TR 351 in Macoupin, Illinois sits above 99% of rated Illinois bridges on inventory load rating (89 t), while its 1920 build year is earlier than 82% of Macoupin's recorded-year cohort (242 bridges).
TR 351 in Macoupin, Illinois is rated Fair in the FHWA's 2024 National Bridge Inventory. Built in 1920, it carries 1 rated component on the inspecting agency's 0-9 scale, and its weakest reported component scores 5. 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:059501700000000
PRE-1950 · STEEL · MULTI-SPAN · CULVERT-LED · LOCAL-ADT · HEAVY-LOAD · CAT-FAIR
- PRE-1950 Pre-1950
- STEEL Steel
- MULTI-SPAN 2 spans
- CULVERT-LED Culvert-led
- LOCAL-ADT Local 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: TR 351
The TR 351 bridge in Macoupin, Illinois carries TR 351 over CAHOKIA CR. It was built in 1920, making it 106 years old today. It was last reconstructed in 1970, extending its service life. The structure is built primarily of steel and spans 2 sections, stretching 7.0 meters (23 feet) end to end. Daily traffic averages 175 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 culvert at 5/9. The weakest component sits in fair condition. None of this bridge's reported major components fall into the Poor condition range.
How TR 351 compares
Age against the county: built in 1920, earlier than 199 of Macoupin's 242 bridges with a recorded construction year (82%), against a county median build year of 1975. 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).
TR 351 vs every rated Illinois bridge
Inventory load rating (metric tons), FHWA NBI, this state
89 Top 1% higher than 99% 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.
Macoupin inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 242 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
- 1920
- Last Reconstructed
- 1970
- Material
- Steel
- Number of Spans
- 2
- Structure Length
- 7.0 m (23 ft) 0
- Owner
- Town/Township Highway Agency
- Avg Daily Traffic
- 175 vehicles/day
- Structure Number
- 059501700000000
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 TR 351 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 TR 351 against other structures in Macoupin 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 TR 351?
TR 351 in Macoupin, Illinois on the FHWA's 0–9 scale.
How often is TR 351 inspected?
TR 351'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 175 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. TR 351 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 TR 351?
TR 351 has an NBI inventory load rating of 89.1 metric tons.
Who is responsible for maintaining TR 351?
TR 351 is owned and maintained by Town/Township Highway Agency.
How old is TR 351 and does age affect safety?
TR 351 was built in 1920, making it 106 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.
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.