Bridge conditions in Carroll County, Illinois
180 inventoried bridges · 26 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Of the 180 Carroll County bridges in the federal inventory, 26 carry a poor rating. That 14.4% share is roughly 2x the national average.
- 26 of the 180 bridges in Carroll County, Illinois, are rated in poor condition (14.4%) in the 2025 National Bridge Inventory, as of .
- 58 bridges (32.2%) are rated good and 96 (53.3%) fair.
- The median Carroll County bridge was built in 1984.
- The busiest poor-rated bridge is Argo Fay Road over Stream (built 1937), carrying about 2,350 vehicles a day.
Good 32.2% · Fair 53.3% · Poor 14.4% of 180 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 |
|---|---|---|---|
| Argo Fay Road over Stream | 1937 | 2,350 | Poor |
| E Milledgeville Rt over Elkhorn Creek | 1939 | 1,050 | Poor |
| TR-38 (W Wacker Rd over Plum River | 1977 | 775 | Poor |
| Oil Valley School over East Johnson Creek | 1980 | 200 | Poor |
| Oil Valley School over Johnson Creek | 1986 | 200 | Poor |
| Vanbuskirk Rd over Straddle Creek | 1982 | 200 | Poor |
| Zion Rd - Ch 16 over Camp Creek | 1994 | 150 | Poor |
| West Doty Road over Drainage Ditch | 1984 | 150 | Poor |
| FAS-2077 E Brkvl R over Otter Creek | 1970 | 150 | Poor |
| Fulrath Mill Rd over Carroll Creek | 1980 | 125 | Poor |
| Eagle Point Rd over Elkhorn Creek | 1996 | 125 | Poor |
| W Wacker Road over Johnson Creek | 1982 | 100 | Poor |
| Scenic Bluff Rd over Carroll Creek | 1974 | 75 | Poor |
| W Fairhaven Road over Johnson Creek | 1981 | 75 | Poor |
| North Meyers Road over Br E Fork Plum River | 1899 | 50 | Poor |
| Scenic Bluff Road over Deer Creek | 1982 | 50 | Poor |
| Tr-147 (east Elm R over Otter Creek | 1975 | 50 | Poor |
| Brookville Rd over Elkhorn Creek | 1985 | 50 | Poor |
| Fremont Road over Elkhorn Creek | 1966 | 50 | Poor |
| Big Cut Rd over BNSF RR | 1924 | 50 | Poor |
| TR-66 (Mill Road) over BNSF RR | 1920 | 50 | Poor |
| TR-67 (Messmer Roa over E Plum River | 1962 | 25 | Poor |
| E Keltner Road over E Fork Plum River | 1886 | 25 | Poor |
| Skunk Hollow Road over Br of E Fork Plum Rv | 1981 | 25 | Poor |
| TR-82 (Daggert Roa over East Johnson Creek | 1916 | 25 | Poor |
| Tr 128 S Prowant R over Branch Rock Creek | 1962 | 25 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Il 84 over BNSF RR | 1988 | 5,550 | Fair |
| Il 84 over Soo Line Rr/city St | 1988 | 5,550 | Fair |
| Ill 84 over Plum River | 1978 | 4,200 | Fair |
| US 52 & Il 64 over Straddle Creek | 1996 | 3,500 | Good |
| US 52 & Il 64 over Plum River | 1999 | 3,450 | Fair |
| Ill 73 over Straddle Creek | 1989 | 3,350 | Fair |
| Il 40 over Elkhorn Creek Trib. | 1993 | 3,250 | Good |
| Ill 72 over Stream | 2007 | 3,100 | Good |
| Il 72 over Drainage | 2007 | 3,100 | Good |
| Ill 64 over Stream | 2008 | 3,100 | 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.