Bridge conditions in Williamson County, Illinois
200 inventoried bridges · 7 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Williamson County tracks close to typical: 7 of its 200 inventoried bridges (3.5%) are rated poor, against a national rate of about 7%.
- 7 of the 200 bridges in Williamson County, Illinois, are rated in poor condition (3.5%) in the 2025 National Bridge Inventory, as of .
- 133 bridges (66.5%) are rated good and 60 (30.0%) fair.
- The median Williamson County bridge was built in 1990.
- The busiest poor-rated bridge is Ill 13 EB over Craborchard Lake (built 1964), carrying about 25,600 vehicles a day.
Good 66.5% · Fair 30.0% · Poor 3.5% of 200 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 |
|---|---|---|---|
| Ill 13 EB over Craborchard Lake | 1964 | 25,600 | Poor |
| Ill 13 EB over Craborchard Lake | 1964 | 23,500 | Poor |
| Fas 903 (ch 2) over Interstate 57 | 1961 | 6,500 | Poor |
| Tr 241 (cedar Grov over Interstate 57 | 1961 | 1,750 | Poor |
| Tr 23 (stiritz Rd) over Interstate 57 | 1961 | 1,000 | Poor |
| Tr 608 over Mine Haulage Road | 1978 | 250 | Poor |
| Tr 573 over South Fork Saline R. | 1977 | 175 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| WB Il 13 over BNSF RR | 2015 | 26,300 | Good |
| EB Il 13 over BNSF RR | 2014 | 26,300 | Fair |
| WB Il 13 over Marathon Dr | 2015 | 26,300 | Good |
| EB Il 13 over Marathon Dr | 2014 | 26,300 | Good |
| Ill 13 over Stream | 1959 | 26,300 | Good |
| Ill 13 EB over Craborchard Lake | 1964 | 25,600 | Poor |
| Ill 13 WB over Crab Orchard Lake | 1939 | 25,600 | Fair |
| Ill 13 EB over Craborchard Lake | 1964 | 23,500 | Poor |
| Ill 13 WB over Crab Orchard Lake | 1939 | 23,500 | Fair |
| I 57 NB over Lake Creek Branch | 1961 | 19,850 | 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.