TOWNSHIP ROAD 451
Carrying TOWNSHIP ROAD 451 over GIRDER CR
4.1 M E BRIGHTON, Macoupin, Illinois
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: TOWNSHIP ROAD 451
The TOWNSHIP ROAD 451 bridge in Macoupin, Illinois carries TOWNSHIP ROAD 451 over GIRDER CR. It was built in 1900, making it 126 years old today. It was last reconstructed in 1971, extending its service life. The structure is built primarily of prestressed concrete and spans 3 sections, stretching 38.9 meters (128 feet) end to end. Daily traffic averages 200 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 4/9, superstructure at 4/9, substructure at 6/9. The weakest component sits in poor condition. At least one major component here scores 4 or below, which produces a Poor condition classification under FHWA's current reporting rules. Its NBI inventory load rating is 30.5 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How TOWNSHIP ROAD 451 compares
Live comparison across Illinois.
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 How the historical reference is calculated.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
- 1900
- Last Reconstructed
- 1971
- Material
- Prestressed Concrete
- Number of Spans
- 3
- Structure Length
- 38.9 m (128 ft)
- Deck Width
- 8.2 m (27 ft)
- Owner
- Town/Township Highway Agency
- Avg Daily Traffic
- 200 vehicles/day
- Structure Number
- 059327300000000
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • The deck (driving surface) is in poor condition (4/9), showing advanced deterioration that may require priority repair.
- • The superstructure (beams and supports above the deck) rates poor at 4/9, advanced deterioration that should be prioritized for repair.
- • At 6/9, the substructure (piers and abutments) shows fair condition, with minor wear flagged for upkeep.
How to read this record
TOWNSHIP ROAD 451 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 TOWNSHIP ROAD 451 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 TOWNSHIP ROAD 451?
TOWNSHIP ROAD 451 in Macoupin, Illinois has a deck rating of 4/9, superstructure rating of 4/9, and substructure rating of 6/9 on the FHWA's 0–9 scale.
How often is TOWNSHIP ROAD 451 inspected?
TOWNSHIP ROAD 451'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 200 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. TOWNSHIP ROAD 451 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 TOWNSHIP ROAD 451?
TOWNSHIP ROAD 451 has an NBI inventory load rating of 30.5 metric tons.
Who is responsible for maintaining TOWNSHIP ROAD 451?
TOWNSHIP ROAD 451 is owned and maintained by Town/Township Highway Agency.
How old is TOWNSHIP ROAD 451 and does age affect safety?
TOWNSHIP ROAD 451 was built in 1900, making it 126 years old and last reconstructed in 1971.
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.