Bridge conditions in Carroll County, Illinois
180 inventoried bridges · 26 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Of the 180 Carroll County bridges in the federal inventory, 26 carry a poor rating. That 14.4% share is roughly 2x the national average.
- 26 of the 180 bridges in Carroll County, Illinois, are rated in poor condition (14.4%) in the 2025 National Bridge Inventory, as of .
- 58 bridges (32.2%) are rated good and 96 (53.3%) fair.
- The median Carroll County bridge was built in 1984.
- The busiest poor-rated bridge is Argo Fay Road over Stream (built 1937), carrying about 2,350 vehicles a day.
Good 32.2% · Fair 53.3% · Poor 14.4% of 180 bridges
Bridges rated poor
Every bridge in the county with a poor rating, busiest first. Poor means a major component is rated 4 or lower on FHWA's 0-9 scale; it is a repair flag, not a closure notice.
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Il 84 over BNSF RR | 1988 | 5,550 | Fair |
| Il 84 over Soo Line Rr/city St | 1988 | 5,550 | Fair |
| Ill 84 over Plum River | 1978 | 4,200 | Fair |
| US 52 & Il 64 over Straddle Creek | 1996 | 3,500 | Good |
| US 52 & Il 64 over Plum River | 1999 | 3,450 | Fair |
| Ill 73 over Straddle Creek | 1989 | 3,350 | Fair |
| Il 40 over Elkhorn Creek Trib. | 1993 | 3,250 | Good |
| Ill 72 over Stream | 2007 | 3,100 | Good |
| Il 72 over Drainage | 2007 | 3,100 | Good |
| Ill 64 over Stream | 2008 | 3,100 | Fair |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
Every bridge in Carroll County → - all 180, busiest first, each with its own condition record.
All of Illinois: Illinois bridge conditions by county · every download on the data page.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.