PRAIRIE HILL RD
Carrying PRAIRIE HILL RD over ROCK RIVER
0.4 MI W ILL 2, Winnebago, Illinois
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: PRAIRIE HILL RD
The PRAIRIE HILL RD bridge in Winnebago, Illinois carries PRAIRIE HILL RD over ROCK RIVER. It was built in 1966, making it 60 years old today. The structure is built primarily of steel continuous and spans 5 sections, stretching 128.2 meters (421 feet) end to end. Daily traffic averages 4,200 vehicles, placing it in the moderately-trafficked tier of Illinois bridges. It is owned and maintained by County Highway Agency.
The latest FHWA inspection records show a deck rating of 4/9, superstructure at 5/9, 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. Its NBI inventory load rating is 34.3 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How PRAIRIE HILL RD 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 How the historical reference is calculated.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
- 1966
- Material
- Steel Continuous
- Number of Spans
- 5
- Structure Length
- 128.2 m (421 ft)
- Deck Width
- 11.0 m (36 ft)
- Owner
- County Highway Agency
- Avg Daily Traffic
- 4,200 vehicles/day
- Structure Number
- 101011800000000
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • At 4/9, the deck (driving surface) is in poor shape, with advanced wear flagged for priority repair.
- • At 5/9, the superstructure (beams and supports above the deck) shows fair condition, with minor wear flagged for upkeep.
- • The substructure (piers and abutments) rates fair at 6/9, minor deterioration that routine maintenance should address.
How to read this record
PRAIRIE HILL RD 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 PRAIRIE HILL RD against other structures in Winnebago 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 PRAIRIE HILL RD?
PRAIRIE HILL RD in Winnebago, Illinois has a deck rating of 4/9, superstructure rating of 5/9, and substructure rating of 6/9 on the FHWA's 0–9 scale.
How often is PRAIRIE HILL RD inspected?
PRAIRIE HILL RD'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 4,200 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. PRAIRIE HILL RD 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 PRAIRIE HILL RD?
PRAIRIE HILL RD has an NBI inventory load rating of 34.3 metric tons.
Who is responsible for maintaining PRAIRIE HILL RD?
PRAIRIE HILL RD is owned and maintained by County Highway Agency.
How old is PRAIRIE HILL RD and does age affect safety?
PRAIRIE HILL RD was built in 1966, making it 60 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.