Bridge conditions in Brown County, Illinois
71 inventoried bridges · 10 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Of the 71 Brown County bridges in the federal inventory, 10 carry a poor rating. That 14.1% share is roughly 2x the national average.
- 10 of the 71 bridges in Brown County, Illinois, are rated in poor condition (14.1%) in the 2025 National Bridge Inventory, as of .
- 34 bridges (47.9%) are rated good and 27 (38.0%) fair.
- The median Brown County bridge was built in 1984.
- The busiest poor-rated bridge is Fas 582 over Russet Branch (built 1957), carrying about 250 vehicles a day.
Good 47.9% · Fair 38.0% · Poor 14.1% of 71 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 |
|---|---|---|---|
| Fas 582 over Russet Branch | 1957 | 250 | Poor |
| Fas 582 over Lamoine River | 1991 | 175 | Poor |
| Ch-12 (fas 582) over Camp Creek | 1997 | 125 | Poor |
| Tr 24 over Missouri Creek | 1920 | 75 | Poor |
| Tr 84A over Little Missouri | 1900 | 75 | Poor |
| Tr 84A over So Br Lt Missouri | 1900 | 75 | Poor |
| Tr 166 over Mccurdy Branch | 1915 | 50 | Poor |
| Tr 111 over Br Logan Creek | 1900 | 25 | Poor |
| Tr 144 over North Fork | 1900 | 25 | Poor |
| Tr 156 over Camp Creek | 1983 | 25 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 24 over Lamoine River | 2011 | 3,050 | Fair |
| Il 107 over Mckee Creek | 1950 | 1,400 | Good |
| Il 99 over N Fork Shelby Creek | 1931 | 750 | Fair |
| Il 99 over Missouri Creek | 1931 | 500 | Fair |
| Ch 6 over Purpus Creek | 1905 | 475 | Fair |
| Ch 6 over Wells Fork | 1949 | 450 | Fair |
| Ch 6 over Cronin Hollow | 1999 | 400 | Good |
| Fas 1588 over Dry Fork CR | 1981 | 275 | Fair |
| Fas 585 over Camp Crk | 1936 | 250 | Fair |
| Ch 7 over Mckee Creek | 1968 | 250 | 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.