GRASSY ROAD
Carrying GRASSY ROAD over LITTLE GRASSY LK SPILLWY
10.0 MI SW OF HDQRTRS, Williamson, Illinois
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: GRASSY ROAD
The GRASSY ROAD bridge in Williamson, Illinois carries GRASSY ROAD over LITTLE GRASSY LK SPILLWY. It was built in 1939, making it 87 years old today. The structure is built primarily of steel and spans 2 sections, stretching 37.8 meters (124 feet) end to end. Daily traffic averages 800 vehicles, placing it in the lower-traffic tier of Illinois bridges. It is owned and maintained by Bureau of Fish and Wildlife.
The latest FHWA inspection records show a deck rating of 6/9, superstructure at 6/9, substructure at 7/9. The weakest component sits in fair condition. None of this bridge's reported major components fall into the Poor condition range. Its NBI inventory load rating is 7.3 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How GRASSY ROAD 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 How the historical reference is calculated.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
- 1939
- Material
- Steel
- Number of Spans
- 2
- Structure Length
- 37.8 m (124 ft)
- Deck Width
- 10.0 m (33 ft)
- Owner
- Bureau of Fish and Wildlife
- Avg Daily Traffic
- 800 vehicles/day
- Structure Number
- 000033610-00400
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • At 6/9, the deck (driving surface) shows fair condition, with minor wear flagged for upkeep.
- • The superstructure (beams and supports above the deck) rates fair at 6/9, minor deterioration that routine maintenance should address.
- • The substructure (piers and abutments) rates good at 7/9, with no significant deterioration on file.
How to read this record
This page shows what the last federal inspection recorded, not whether GRASSY ROAD 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 GRASSY ROAD against other structures in Williamson 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 GRASSY ROAD?
GRASSY ROAD in Williamson, Illinois has a deck rating of 6/9, superstructure rating of 6/9, and substructure rating of 7/9 on the FHWA's 0–9 scale.
How often is GRASSY ROAD inspected?
GRASSY ROAD'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 800 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. GRASSY ROAD 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 GRASSY ROAD?
GRASSY ROAD has an NBI inventory load rating of 7.3 metric tons.
Who is responsible for maintaining GRASSY ROAD?
GRASSY ROAD is owned and maintained by Bureau of Fish and Wildlife.
How old is GRASSY ROAD and does age affect safety?
GRASSY ROAD was built in 1939, making it 87 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.