Bridge conditions in Logan County, Illinois
292 inventoried bridges · 27 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
The federal inventory lists 292 bridges in Logan County: 82 rated good, 183 fair, and 27 poor.
- 27 of the 292 bridges in Logan County, Illinois, are rated in poor condition (9.2%) in the 2025 National Bridge Inventory, as of .
- 82 bridges (28.1%) are rated good and 183 (62.7%) fair.
- The median Logan County bridge was built in 1975.
- The busiest poor-rated bridge is I-155 & Ramps A & over S Fk Prairie Creek (built 1990), carrying about 5,825 vehicles a day.
Good 28.1% · Fair 62.7% · Poor 9.2% of 292 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 |
|---|---|---|---|
| I-155 & Ramps A & over S Fk Prairie Creek | 1990 | 5,825 | Poor |
| South Beason Rd over Deer Ck Br | 1965 | 800 | Poor |
| Bl 55 (old US 66) over I-55 | 1973 | 500 | Poor |
| Palmer Ave over Brainards Branch | 1966 | 500 | Poor |
| Waynesville Road over Kickapoo Creek | 1980 | 325 | Poor |
| Tr 199A over Lake Fork | 1978 | 225 | Poor |
| New Holland-san Jo over Prairie Ck | 1961 | 150 | Poor |
| Tr-56 over Lake Fork Creek Trib | 1958 | 100 | Poor |
| Tr 176 over Lake Fork Ck Fld Pln | 1965 | 100 | Poor |
| Tr 158 over Salt Creek | 1991 | 75 | Poor |
| Tr 45 over Prairie Ck | 1965 | 75 | Poor |
| Tr 9 over Prairie Ck | 1964 | 75 | Poor |
| Ch 43E (ch 24) over Prairie Ck | 1987 | 50 | Poor |
| Skunk Hollow Rd over Kickapoo Creek Trib | 1900 | 50 | Poor |
| Tr 152 over Lake Fork Ck Trib | 1959 | 50 | Poor |
| Tr 25 over Local Drainage | 1960 | 50 | Poor |
| Tr 195 over Salt Ck Trib | 1958 | 50 | Poor |
| Tr 188 over Lake Fork Ck Fld Pln | 1969 | 50 | Poor |
| Tr 23 over Prairie Ck | 1964 | 50 | Poor |
| Tr 38 over Prairie Ck | 1954 | 50 | Poor |
| Tr 54 over Prairie Ck | 1972 | 50 | Poor |
| Tr 44 over Sugar Ck Flood Plain | 1991 | 50 | Poor |
| Tr 35 over Local Drainage | 1960 | 35 | Poor |
| Tr 212 over Lake Fork Ck Trib | 1961 | 35 | Poor |
| Tr 17 over Prairie Creek | 1978 | 35 | Poor |
| Tr 218 over Lake Fork Ck Fld Pln | 1968 | 25 | Poor |
| Tr 218 over Local Drainage | 1968 | 25 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-55 over Hurlbut Creek | 1974 | 34,900 | Fair |
| I 55 & E&w Fr Rds over Wolf Creek | 1944 | 33,125 | Fair |
| I-55 over Drainage Ditch | 1974 | 32,400 | Fair |
| I-55 over Clear Creek | 1976 | 21,600 | Fair |
| I-55 over Drainage Ditch | 1974 | 21,500 | Fair |
| I-55 over Trib Lake Fork | 1922 | 17,450 | Fair |
| I-55 SB over Kickapoo Creek | 1973 | 15,150 | Fair |
| I-55 NB over Kickapoo Creek | 1973 | 15,150 | Fair |
| I-55 SB over Salt Creek | 1973 | 13,750 | Fair |
| I-55 NB over Salt Creek | 1973 | 13,750 | Fair |
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.