Jefferson County Bridge Report Card
Jefferson County scores 75 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Jefferson County, Illinois
Jefferson County has 259 bridges in the National Bridge Inventory, with 21 rated poor and 0 rated scour-critical. Its poor-condition share of 8.1% is at or below the 9.5% statewide average. Poor-condition bridges carry about 104,295 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Jefferson County a Bridge Condition Exposure Score of 75/100 (C). The county has 259 bridges in the National Bridge Inventory, including 21 in poor condition and 0 rated scour-critical. Poor-condition bridges carry about 104,295 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 | 8.1% | 16.2 |
| Poor-condition traffic exposure | 25 | 11.8% of measured traffic | 8.8 |
| Scour-critical bridge share | 20 | 0.0% | 0.0 |
| Average age vs national baseline | 10 | 42 years vs 48 nationally | 0.0 |
| Traffic-data completeness | 5 | 887,430 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 | 8.1% |
| State Poor-Condition Share | 9.5% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 0.0% |
| Average Bridge Age | 42 years |
| Poor-Condition Traffic Exposure | 104,295 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Jefferson County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| Fap-821 (ill-15) over Fai-57 | Poor condition + traffic exposure | Poor | 18,800 | 1968 |
| I 57 NB over Dodds Creek | Poor condition + traffic exposure | Poor | 18,100 | 1965 |
| I 57 SB over Dodds Creek | Poor condition + traffic exposure | Poor | 18,100 | 1965 |
| I 64 EB over Fap-724 (ill-37) | Poor condition + traffic exposure | Poor | 5,500 | 1972 |
| I 64 WB over Casey Fk & Un Pac Rr | Poor condition + traffic exposure | Poor | 5,500 | 1972 |
| I 64 EB over Casey Fk & Un Pac Rr | Poor condition + traffic exposure | Poor | 5,500 | 1972 |
| Fap-821 (ill-15) over Big Muddy Overflow | Poor condition + traffic exposure | Poor | 5,350 | 1923 |
| I 64 EB over Cnic Rr | Poor condition + traffic exposure | Poor | 5,125 | 1974 |
| I 64 WB over Cnic Rr | Poor condition + traffic exposure | Poor | 5,125 | 1974 |
| Fas-2869 (ill-37) over Stream | Poor condition + traffic exposure | Poor | 4,150 | 1921 |
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.