Bridge conditions in Kane County, Illinois
339 inventoried bridges · 24 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
The federal inventory lists 339 bridges in Kane County: 153 rated good, 162 fair, and 24 poor.
- 24 of the 339 bridges in Kane County, Illinois, are rated in poor condition (7.1%) in the 2025 National Bridge Inventory, as of .
- 153 bridges (45.1%) are rated good and 162 (47.8%) fair.
- The median Kane County bridge was built in 1988.
- The busiest poor-rated bridge is US 20 By Pass over Fox River (built 1960), carrying about 47,200 vehicles a day.
Good 45.1% · Fair 47.8% · Poor 7.1% of 339 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-88 WB over Fox R - RR - Il 25 | 1958 | 86,200 | Fair |
| I-88 EB over Fox R - RR - Il 25 | 2008 | 86,200 | Fair |
| I-90 over S Br Kishwaukee Riv | 2014 | 76,200 | Good |
| I-90 over Stream | 1958 | 58,700 | Good |
| I-90 over Sleepy Hollow Rd | 2014 | 52,600 | Good |
| I-90 over Sleepy Hollow Rd | 2014 | 52,600 | Good |
| I-90 (WB) over Ill. Rte. 31 | 2015 | 52,600 | Good |
| I-90 (EB) over Illinois Route 31 | 2016 | 52,600 | Good |
| I-90 (EB) over Fox River/Duncan Ave | 2015 | 52,600 | Good |
| I-90 (WB) over Fox River/Duncan Ave | 2015 | 52,600 | Good |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
Every bridge in Kane County → - all 339, 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.