Bridge conditions in Cass County, Illinois
76 inventoried bridges · 13 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Cass County has 13 bridges rated poor out of 76 inventoried, a 17.1% share that puts it well above the national rate of about 7%.
- 13 of the 76 bridges in Cass County, Illinois, are rated in poor condition (17.1%) in the 2025 National Bridge Inventory, as of .
- 24 bridges (31.6%) are rated good and 39 (51.3%) fair.
- The median Cass County bridge was built in 1989.
- The busiest poor-rated bridge is US 67 / Il 100 over Illinois River (built 1955), carrying about 5,600 vehicles a day.
Good 31.6% · Fair 51.3% · Poor 17.1% of 76 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.
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 67 / Il 100 over Illinois River | 1955 | 5,600 | Poor |
| Fas 579 over Prairie Creek | 1960 | 1,750 | Poor |
| Fau 7779 over Clear Creek | 1968 | 1,650 | Poor |
| FAS577 over Lost Creek | 1936 | 650 | Poor |
| Tr 26 over Indian Creek | 1971 | 275 | Poor |
| Fas 573 over Panther Creek | 1984 | 175 | Poor |
| Tr 224 over Middle Crk. | 1963 | 75 | Poor |
| Tr 32 over Lost Creek | 1968 | 75 | Poor |
| Tr 124 over Little Indian | 1966 | 75 | Poor |
| Tr 62 over Lost Creek | 1971 | 50 | Poor |
| Tr 146 over Panther Creek | 1997 | 50 | Poor |
| Tr 2 over Indian Creek | 1989 | 50 | Poor |
| Tr 68 over Prairie Creek | 1978 | 50 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Il 125 over BNSF RR | 1956 | 6,600 | Fair |
| US 67 / Il 100 over Illinois River | 1955 | 5,600 | Poor |
| Il 125 over Lost Creek | 2001 | 3,900 | Good |
| Il 125 over Trib to Lost Creek | 2009 | 3,500 | Good |
| Il 125 over Trib to Lost Creek | 2009 | 3,500 | Good |
| Il 78 over Prairie Creek | 1998 | 2,050 | Good |
| Fas 579 over Mannel Branch | 1964 | 1,900 | Fair |
| US 67 / Ill 100 over Indian Creek | 1991 | 1,800 | Fair |
| Fas 579 over Prairie Creek | 1960 | 1,750 | Poor |
| Fau 7779 over Clear Creek | 1968 | 1,650 | Poor |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
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.