ZILLES RD/ TR 392
Carrying ZILLES RD/ TR 392 over TRIB TO SPANKER BR
4.5MI SE HIGHLAND, Madison, Illinois
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: ZILLES RD/ TR 392
The ZILLES RD/ TR 392 bridge in Madison, Illinois carries ZILLES RD/ TR 392 over TRIB TO SPANKER BR. It was built in 1925, making it 101 years old today. The structure is built primarily of concrete and spans 1 section, stretching 6.7 meters (22 feet) end to end. Daily traffic averages 150 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 8/9. 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 17.5 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How ZILLES RD/ TR 392 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 How the historical reference is calculated.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
- 1925
- Material
- Concrete
- Number of Spans
- 1
- Structure Length
- 6.7 m (22 ft)
- Deck Width
- 6.1 m (20 ft)
- Owner
- Town/Township Highway Agency
- Avg Daily Traffic
- 150 vehicles/day
- Structure Number
- 060320700000000
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • The deck (driving surface) rates poor at 4/9, advanced deterioration that should be prioritized for repair.
- • The superstructure (beams and supports above the deck) is in poor condition (4/9), showing advanced deterioration that may require priority repair.
- • The substructure (piers and abutments) is in good condition (8/9), showing no significant deterioration.
How to read this record
ZILLES RD/ TR 392 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 ZILLES RD/ TR 392 against other structures in Madison 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 ZILLES RD/ TR 392?
ZILLES RD/ TR 392 in Madison, Illinois has a deck rating of 4/9, superstructure rating of 4/9, and substructure rating of 8/9 on the FHWA's 0–9 scale.
How often is ZILLES RD/ TR 392 inspected?
ZILLES RD/ TR 392'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 150 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. ZILLES RD/ TR 392 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 ZILLES RD/ TR 392?
ZILLES RD/ TR 392 has an NBI inventory load rating of 17.5 metric tons.
Who is responsible for maintaining ZILLES RD/ TR 392?
ZILLES RD/ TR 392 is owned and maintained by Town/Township Highway Agency.
How old is ZILLES RD/ TR 392 and does age affect safety?
ZILLES RD/ TR 392 was built in 1925, making it 101 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.
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.