Bridge conditions in Montgomery County, Illinois
261 inventoried bridges · 10 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
The federal inventory lists 261 bridges in Montgomery County: 135 rated good, 116 fair, and 10 poor.
- 10 of the 261 bridges in Montgomery County, Illinois, are rated in poor condition (3.8%) in the 2025 National Bridge Inventory, as of .
- 135 bridges (51.7%) are rated good and 116 (44.4%) fair.
- The median Montgomery County bridge was built in 1984.
- The busiest poor-rated bridge is MS-1070 Seward St over Ditch (built 1920), carrying about 1,350 vehicles a day.
Good 51.7% · Fair 44.4% · Poor 3.8% of 261 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 |
|---|---|---|---|
| MS-1070 Seward St over Ditch | 1920 | 1,350 | Poor |
| Tr 408 over Creek | 1900 | 150 | Poor |
| Tr 199 over Stream | 1900 | 75 | Poor |
| Tr 314 over Mdl Fk Shoal CR | 1969 | 75 | Poor |
| Tr 17 over I-55 | 1970 | 50 | Poor |
| Tr 457 over Dry Fork Crk. | 1954 | 50 | Poor |
| Tr 0193 over Shop Creek | 1975 | 50 | Poor |
| Tr 167 A over Fawn Creek | 1900 | 25 | Poor |
| Tr 374 over Hurricane CR | 1900 | 25 | Poor |
| Tr 225 over Hurricane CR | 1900 | 25 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-55 over Horse Creek | 1972 | 31,350 | Fair |
| I-55 and FRs over Horse Creek | 1950 | 29,350 | Fair |
| FAI 55 and FRs over Shop Creek Trib | 1942 | 26,800 | Fair |
| I-55 and FRs over Shop Creek | 1943 | 26,800 | Fair |
| I-55 over Three Mile Branch | 1973 | 26,500 | Fair |
| I-55 (NB) over Macoupin Creek | 1972 | 14,400 | Fair |
| I-55 (SB) over Macoupin Creek | 1973 | 14,400 | Fair |
| I-55 (SB) over Burlingtn Northrn RR | 1973 | 13,250 | Fair |
| I-55 (NB) over Burlingtn Northrn RR | 1973 | 13,250 | Fair |
| Il 16 over Middle Fk Shoal CR | 1989 | 7,800 | 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.