Bridge conditions in Warren County, Illinois
199 inventoried bridges · 15 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
The federal inventory lists 199 bridges in Warren County: 135 rated good, 49 fair, and 15 poor.
- 15 of the 199 bridges in Warren County, Illinois, are rated in poor condition (7.5%) in the 2025 National Bridge Inventory, as of .
- 135 bridges (67.8%) are rated good and 49 (24.6%) fair.
- The median Warren County bridge was built in 1987.
- The busiest poor-rated bridge is US 34 Il 164 Il 1 over Cedar CR Trib (built 1964), carrying about 9,450 vehicles a day.
Good 67.8% · Fair 24.6% · Poor 7.5% of 199 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 34 Il 164 Il 1 over Cedar CR Trib | 1964 | 9,450 | Poor |
| US 34 over Cedar Creek Trib | 1985 | 8,950 | Poor |
| US 34 & 67 (NB) over BNSF RR (079039A) | 1975 | 8,100 | Poor |
| US 34 over Sbi 8 (old US 34) | 1985 | 8,050 | Poor |
| US 67 over Middle Hendn CR | 1954 | 2,250 | Poor |
| Ill 135 over Davids CR | 1930 | 1,150 | Poor |
| Ch-7 over Cedar Creek | 1900 | 150 | Poor |
| TR 232 (165th St) over US 34 & Cedar Creek | 1979 | 75 | Poor |
| Tr 175 over Slug Run | 1900 | 75 | Poor |
| Tr 188 over Br Cedar Fk CR | 1961 | 50 | Poor |
| Tr 3 over Br Mid Hend CR | 1974 | 50 | Poor |
| Tr 261 over Swan CR | 1966 | 50 | Poor |
| Tr 158 over Trib. Little Swan CR | 1992 | 50 | Poor |
| Tr 183 over South Fork Creek | 1981 | 50 | Poor |
| Tr 70A over Cedar CR | 1900 | 20 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 34 Il 164 Il 1 over Cedar CR Trib | 1964 | 9,450 | Poor |
| US 34 over Cedar Creek Trib | 1985 | 8,950 | Poor |
| US 34 over Tr 206 (150TH St) | 1985 | 8,950 | Fair |
| US 34 over Trib to Cedar CR | 1986 | 8,950 | Fair |
| US 34 over Trib to Cedar CR | 1986 | 8,950 | Fair |
| US 34 over Cedar Creek | 2023 | 8,950 | Good |
| US 34 & 67 (NB) over BNSF RR (079039A) | 1975 | 8,100 | Poor |
| US 34 & 67 (SB) over BNSF RR (079039A) | 1992 | 8,100 | Fair |
| WB US 34 over TR 162 (120th St) | 2021 | 8,050 | Good |
| EB US 34 over TR 162 (120th St) | 2021 | 8,050 | Good |
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.