Kane County Bridge Report Card
Kane County scores 81 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Kane County, Illinois
Kane County has 339 bridges in the National Bridge Inventory, with 24 rated poor and 2 rated scour-critical. Its poor-condition share of 7.1% is at or below the 9.5% statewide average. Poor-condition bridges carry about 206,525 daily vehicle crossings.
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Copyable Facts for Reporters
BridgeLookup.com gives Kane County a Bridge Condition Exposure Score of 81/100 (B). The county has 339 bridges in the National Bridge Inventory, including 24 in poor condition and 2 rated scour-critical. Poor-condition bridges carry about 206,525 daily vehicle crossings. Poor condition does not mean unsafe; bridges judged unsafe are closed or restricted by transportation agencies.
How the Score Breaks Down
| Factor | Weight | County Value | Penalty |
|---|---|---|---|
| Poor-condition bridge share | 40 | 7.1% | 14.2 |
| Poor-condition traffic exposure | 25 | 5.5% of measured traffic | 4.1 |
| Scour-critical bridge share | 20 | 0.6% | 1.2 |
| Average age vs national baseline | 10 | 40 years vs 48 nationally | 0.0 |
| Traffic-data completeness | 5 | 3,784,200 measured daily crossings | 0.0 |
Score = 100 minus weighted penalties. The score is a comparative research signal, not an official safety rating. Read the full methodology.
County Comparisons
| County Poor-Condition Share | 7.1% |
| State Poor-Condition Share | 9.5% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 0.6% |
| Average Bridge Age | 40 years |
| Poor-Condition Traffic Exposure | 206,525 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Kane County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| Eagle Road over Tyler Creek | Poor condition + traffic exposure | Poor | 150 | 1967 |
| US 20 By Pass over Fox River | Poor condition + traffic exposure | Poor | 47,200 | 1960 |
| US 20 over ST Charles ST | Poor condition + traffic exposure | Poor | 47,200 | 1960 |
| Kirk Road over Union Pacific R.r. | Poor condition + traffic exposure | Poor | 29,300 | 1974 |
| Kimball-st over Fox River | Poor condition + traffic exposure | Poor | 16,900 | 1917 |
| Il 31 over US 20 By Pass | Poor condition + traffic exposure | Poor | 15,800 | 1959 |
| Chicago ST over Fox River | Poor condition + traffic exposure | Poor | 12,400 | 1939 |
| New York Street over Fox River | Poor condition + traffic exposure | Poor | 9,850 | 1931 |
| National Street over Fox River | Poor condition + traffic exposure | Poor | 6,900 | 1949 |
| Hankes RD over Il 56 | Poor condition + traffic exposure | Poor | 3,650 | 1963 |
Important safety note
Poor condition does not mean a bridge is unsafe. It means at least one major component has significant deterioration and the bridge is a priority for maintenance, repair, or replacement. Bridges judged unsafe are closed or restricted by transportation agencies.