Brown County Bridge Report Card
Brown County scores 63 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Brown County, Illinois
Brown County has 71 bridges in the National Bridge Inventory, with 10 rated poor and 1 rated scour-critical. Its poor-condition share of 14.1% is above the 9.5% statewide average. Poor-condition bridges carry about 900 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Brown County a Bridge Condition Exposure Score of 63/100 (D). The county has 71 bridges in the National Bridge Inventory, including 10 in poor condition and 1 rated scour-critical. Poor-condition bridges carry about 900 daily vehicle crossings. Poor condition does not mean unsafe; bridges judged unsafe are closed or restricted by transportation agencies.
How the Score Breaks Down
| Factor | Weight | County Value | Penalty |
|---|---|---|---|
| Poor-condition bridge share | 40 | 14.1% | 28.2 |
| Poor-condition traffic exposure | 25 | 7.1% of measured traffic | 5.3 |
| Scour-critical bridge share | 20 | 1.4% | 2.8 |
| Average age vs national baseline | 10 | 51 years vs 48 nationally | 1.2 |
| Traffic-data completeness | 5 | 12,750 measured daily crossings | 0.0 |
Score = 100 minus weighted penalties. The score is a comparative research signal, not an official safety rating. Read the full methodology.
County Comparisons
| County Poor-Condition Share | 14.1% |
| State Poor-Condition Share | 9.5% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 1.4% |
| Average Bridge Age | 51 years |
| Poor-Condition Traffic Exposure | 900 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Brown County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| Tr 144 over North Fork | Poor condition + traffic exposure | Poor | 25 | 1900 |
| Fas 582 over Russet Branch | Poor condition + traffic exposure | Poor | 250 | 1957 |
| Fas 582 over Lamoine River | Poor condition + traffic exposure | Poor | 175 | 1991 |
| Ch-12 (fas 582) over Camp Creek | Poor condition + traffic exposure | Poor | 125 | 1997 |
| Tr 84a over Little Missouri | Poor condition + traffic exposure | Poor | 75 | 1900 |
| Tr 84a over So Br Lt Missouri | Poor condition + traffic exposure | Poor | 75 | 1900 |
| Tr 24 over Missouri Creek | Poor condition + traffic exposure | Poor | 75 | 1920 |
| Tr 166 over Mccurdy Branch | Poor condition + traffic exposure | Poor | 50 | 1915 |
| Tr 111 over Br Logan Creek | Poor condition + traffic exposure | Poor | 25 | 1900 |
| Tr 156 over Camp Creek | Poor condition + traffic exposure | Poor | 25 | 1983 |
Important safety note
Poor condition does not mean a bridge is unsafe. It means at least one major component has significant deterioration and the bridge is a priority for maintenance, repair, or replacement. Bridges judged unsafe are closed or restricted by transportation agencies.