Cass County Bridge Report Card
Cass County scores 50 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Cass County, Illinois
Cass County has 76 bridges in the National Bridge Inventory, with 13 rated poor and 0 rated scour-critical. Its poor-condition share of 17.1% is above the 9.5% statewide average. Poor-condition bridges carry about 10,525 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Cass County a Bridge Condition Exposure Score of 50/100 (F). The county has 76 bridges in the National Bridge Inventory, including 13 in poor condition and 0 rated scour-critical. Poor-condition bridges carry about 10,525 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 | 17.1% | 34.2 |
| Poor-condition traffic exposure | 25 | 20.5% of measured traffic | 15.4 |
| Scour-critical bridge share | 20 | 0.0% | 0.0 |
| Average age vs national baseline | 10 | 39 years vs 48 nationally | 0.0 |
| Traffic-data completeness | 5 | 51,300 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 | 17.1% |
| State Poor-Condition Share | 9.5% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 0.0% |
| Average Bridge Age | 39 years |
| Poor-Condition Traffic Exposure | 10,525 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Cass County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| US 67 / Il 100 over Illinois River | Poor condition + traffic exposure | Poor | 5,600 | 1955 |
| Fas 579 over Prairie Creek | Poor condition + traffic exposure | Poor | 1,750 | 1960 |
| Fau 7779 over Clear Creek | Poor condition + traffic exposure | Poor | 1,650 | 1968 |
| Fas577 over Lost Creek | Poor condition + traffic exposure | Poor | 650 | 1936 |
| Tr 26 over Indian Creek | Poor condition + traffic exposure | Poor | 275 | 1971 |
| Fas 573 over Panther Creek | Poor condition + traffic exposure | Poor | 175 | 1984 |
| Tr 224 over Middle Crk. | Poor condition + traffic exposure | Poor | 75 | 1963 |
| Tr 124 over Little Indian | Poor condition + traffic exposure | Poor | 75 | 1966 |
| Tr 32 over Lost Creek | Poor condition + traffic exposure | Poor | 75 | 1968 |
| Tr 62 over Lost Creek | Poor condition + traffic exposure | Poor | 50 | 1971 |
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.