Bridge conditions in Monroe County, Illinois
132 inventoried bridges · 11 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
11 of the 132 bridges the federal inventory lists in Monroe County are rated poor; the rest split 79 good and 42 fair.
- 11 of the 132 bridges in Monroe County, Illinois, are rated in poor condition (8.3%) in the 2025 National Bridge Inventory, as of .
- 79 bridges (59.8%) are rated good and 42 (31.8%) fair.
- The median Monroe County bridge was built in 1990.
- The busiest poor-rated bridge is Fai 255 Nb/eb over UPRR (built 1984), carrying about 25,850 vehicles a day.
Good 59.8% · Fair 31.8% · Poor 8.3% of 132 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 |
|---|---|---|---|
| Fai 255 Nb/eb over UPRR | 1984 | 25,850 | Poor |
| Fau 9300 over Carr Creek | 1995 | 3,750 | Poor |
| Fas-1858 (ch-12) over Dennis Hollow | 1927 | 1,350 | Poor |
| Ms 6190 (carl St) over Creek | 1972 | 1,050 | Poor |
| Gall Rd/ Fau 9345 over Carr Creek | 1978 | 675 | Poor |
| Maeystown Mss 1030 over Maeystown Creek | 1941 | 350 | Poor |
| Bluff Rd/ Fas 1857 over Fults Creek | 1983 | 300 | Poor |
| Tr 85 Nike Rd over Richland Creek | 2001 | 275 | Poor |
| Tr 96 "m" Road over Richland Creek | 1987 | 100 | Poor |
| TR139/OUTLET Rd over Monroe City Ck | 1978 | 75 | Poor |
| Tr 145 S. Fork Rd over South Fork | 1988 | 75 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| IL3NB->255WB Rmp E over 255SB->IL3SB Ramp B | 1982 | 36,900 | Fair |
| Il 3 SB over Palmer Rd/Palmer Crk | 1991 | 36,900 | Fair |
| Ill 3 NB over Palmer Rd/Palmer Crk | 1984 | 30,200 | Fair |
| Fai 255 EB over Mississippi River | 1986 | 25,850 | Fair |
| Fai 255WB over Mississippi River | 1984 | 25,850 | Fair |
| Fai 255 Nb/eb over UPRR | 1984 | 25,850 | Poor |
| IL3NB-255WB Ramp A over I 255 NB - Ramp D | 1982 | 25,850 | Fair |
| I 255 NB Ramp D over 255 SB->IL3 SB Rmp B | 1982 | 25,850 | Fair |
| Ill 3 over Wilson Creek | 1958 | 24,200 | Good |
| Fai 255 Sb/wb over UPRR | 1981 | 11,400 | 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.