IL 171 NB FIRST AV
Carrying IL 171 NB FIRST AV over S&S CANAL
0.2 M SE I-55, Cook, Illinois
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: IL 171 NB FIRST AV
The IL 171 NB FIRST AV bridge in Cook, Illinois carries IL 171 NB FIRST AV over S&S CANAL. It was built in 1963, making it 63 years old today. The structure is built primarily of steel continuous. Daily traffic averages 10,600 vehicles, placing it in the heavily-trafficked tier of Illinois bridges.
The latest FHWA inspection records show limited component ratings on file. The weakest component sits in unrated condition. All reported major components score above the Poor range.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How IL 171 NB FIRST AV 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 How the historical reference is calculated.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
- 1963
- Material
- Steel Continuous
- Avg Daily Traffic
- 10,600 vehicles/day
- Structure Number
- 016048700000000
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 IL 171 NB FIRST AV 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 IL 171 NB FIRST AV against other structures in Cook 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 IL 171 NB FIRST AV?
IL 171 NB FIRST AV in Cook, Illinois on the FHWA's 0–9 scale.
How often is IL 171 NB FIRST AV inspected?
IL 171 NB FIRST AV'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 10,600 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. IL 171 NB FIRST AV is currently shown as unrated condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for IL 171 NB FIRST AV?
An inventory load rating is not recorded for IL 171 NB FIRST AV.
Who is responsible for maintaining IL 171 NB FIRST AV?
Ownership is not specified for IL 171 NB FIRST AV in the NBI.
How old is IL 171 NB FIRST AV and does age affect safety?
IL 171 NB FIRST AV was built in 1963, making it 63 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.