Bridge conditions in Mercer County, Illinois
163 inventoried bridges · 23 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
About one in 7 bridges in Mercer County is rated in poor condition: 23 of 163 on the federal inventory, one of the higher shares in Illinois.
- 23 of the 163 bridges in Mercer County, Illinois, are rated in poor condition (14.1%) in the 2025 National Bridge Inventory, as of .
- 78 bridges (47.9%) are rated good and 62 (38.0%) fair.
- The median Mercer County bridge was built in 1984.
- The busiest poor-rated bridge is US 67 over Henderson CR (built 1931), carrying about 2,400 vehicles a day.
Good 47.9% · Fair 38.0% · Poor 14.1% of 163 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 over Henderson CR | 1931 | 2,400 | Poor |
| Fas 209-ch 14 over Eliza Creek N. | 1978 | 1,150 | Poor |
| Fas 206-ch 4 over Parker Run | 1976 | 775 | Poor |
| 4TH St over Pope Creek | 1989 | 650 | Poor |
| Fas 222-ch 22 over Toms Creek | 1976 | 450 | Poor |
| Tr 53 over Camp Creek | 1969 | 175 | Poor |
| Fas 214-ch 13 over Douglas Creek | 1942 | 75 | Poor |
| TR129 over Skunk Creek | 1975 | 75 | Poor |
| Fas 214-ch 13 over Camp Creek | 1973 | 75 | Poor |
| Tr 225 over Br. Pope Creek | 1976 | 75 | Poor |
| Tr 183A over Pope Creek | 1964 | 75 | Poor |
| Fas 1405-ch 12 over Pope Creek | 1971 | 50 | Poor |
| Tr 162 over Maids Run | 1978 | 50 | Poor |
| Tr 240 over Donahue Run | 1991 | 50 | Poor |
| Tr 33 over Burnt Branch | 1984 | 50 | Poor |
| Tr 202 over Dugout Run | 1964 | 25 | Poor |
| Tr 111 over Camp Creek | 1981 | 25 | Poor |
| Tr 109 over Swan Lake Ditch | 1984 | 25 | Poor |
| Tr 47 over Camp Creek | 1983 | 25 | Poor |
| Tr 41 over Camp Creek | 1979 | 25 | Poor |
| Tr 15 over Deerlick Br. | 1900 | 25 | Poor |
| Tr 110 over Stream | 1983 | 25 | Poor |
| Tr 223 over Douglas Creek | 1997 | 10 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 67 over Donahue Creek | 1997 | 5,300 | Fair |
| US 67 over Edwards River | 1998 | 5,300 | Fair |
| Ill 94 over Edwards River | 1960 | 3,450 | Fair |
| Ill 94 over Camp Creek | 1960 | 2,900 | Fair |
| US 67 over Pope Creek | 2024 | 2,600 | Good |
| US 67 over Henderson CR | 1931 | 2,400 | Poor |
| US 67 over Toms Creek | 1999 | 2,400 | Fair |
| Ill 94 over Pike Run | 1956 | 2,100 | Fair |
| Ill 94 over Pope Creek | 1924 | 1,900 | Fair |
| Ill 17 over Edwards River | 2019 | 1,500 | 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.