Clinton County Bridge Report Card
Clinton County scores 85 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Clinton County, Illinois
Clinton County has 190 bridges in the National Bridge Inventory, with 13 rated poor and 0 rated scour-critical. Its poor-condition share of 6.8% is at or below the 9.5% statewide average. Poor-condition bridges carry about 7,150 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Clinton County a Bridge Condition Exposure Score of 85/100 (B). The county has 190 bridges in the National Bridge Inventory, including 13 in poor condition and 0 rated scour-critical. Poor-condition bridges carry about 7,150 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 | 6.8% | 13.7 |
| Poor-condition traffic exposure | 25 | 1.7% of measured traffic | 1.3 |
| Scour-critical bridge share | 20 | 0.0% | 0.0 |
| Average age vs national baseline | 10 | 49 years vs 48 nationally | 0.4 |
| Traffic-data completeness | 5 | 426,295 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 | 6.8% |
| State Poor-Condition Share | 9.5% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 0.0% |
| Average Bridge Age | 49 years |
| Poor-Condition Traffic Exposure | 7,150 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Clinton County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| Albers Rd/fas 785 over Grassy Branch | Poor condition + traffic exposure | Poor | 2,700 | 1973 |
| Ill 177 over Queens Lake | Poor condition + traffic exposure | Poor | 2,000 | 1922 |
| Fas 1781 over Bond Branch | Poor condition + traffic exposure | Poor | 950 | 1963 |
| Emerald RD over Trib To Beaver Crk | Poor condition + traffic exposure | Poor | 350 | 1996 |
| Tr 175 over Prairie Branch | Poor condition + traffic exposure | Poor | 300 | 1940 |
| Court Road/tr177 over Lake Branch | Poor condition + traffic exposure | Poor | 225 | 1992 |
| Shattuc Rd/tr 206 over Brewster Creek | Poor condition + traffic exposure | Poor | 200 | 1966 |
| Tr 133/ Sandoval R over Lost Creek Branch | Poor condition + traffic exposure | Poor | 175 | 1948 |
| Tr 109/old State R over Beaver Creek | Poor condition + traffic exposure | Poor | 75 | 1930 |
| Tr 184a/creek Road over Prairie Branch | Poor condition + traffic exposure | Poor | 75 | 1974 |
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.