Bridge conditions in Logan County, Illinois
292 inventoried bridges · 27 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
The federal inventory lists 292 bridges in Logan County: 82 rated good, 183 fair, and 27 poor.
- 27 of the 292 bridges in Logan County, Illinois, are rated in poor condition (9.2%) in the 2025 National Bridge Inventory, as of .
- 82 bridges (28.1%) are rated good and 183 (62.7%) fair.
- The median Logan County bridge was built in 1975.
- The busiest poor-rated bridge is I-155 & Ramps A & over S Fk Prairie Creek (built 1990), carrying about 5,825 vehicles a day.
Good 28.1% · Fair 62.7% · Poor 9.2% of 292 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 |
|---|---|---|---|
| I-55 over Hurlbut Creek | 1974 | 34,900 | Fair |
| I 55 & E&w Fr Rds over Wolf Creek | 1944 | 33,125 | Fair |
| I-55 over Drainage Ditch | 1974 | 32,400 | Fair |
| I-55 over Clear Creek | 1976 | 21,600 | Fair |
| I-55 over Drainage Ditch | 1974 | 21,500 | Fair |
| I-55 over Trib Lake Fork | 1922 | 17,450 | Fair |
| I-55 SB over Kickapoo Creek | 1973 | 15,150 | Fair |
| I-55 NB over Kickapoo Creek | 1973 | 15,150 | Fair |
| I-55 SB over Salt Creek | 1973 | 13,750 | Fair |
| I-55 NB over Salt Creek | 1973 | 13,750 | 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 Logan County → - all 292, 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.