Macon County Bridge Report Card
Macon County scores 61 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Macon County, Illinois
Macon County has 346 bridges in the National Bridge Inventory, with 54 rated poor and 0 rated scour-critical. Its poor-condition share of 15.6% is above the 9.5% statewide average. Poor-condition bridges carry about 87,405 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Macon County a Bridge Condition Exposure Score of 61/100 (D). The county has 346 bridges in the National Bridge Inventory, including 54 in poor condition and 0 rated scour-critical. Poor-condition bridges carry about 87,405 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 | 15.6% | 31.2 |
| Poor-condition traffic exposure | 25 | 10.1% of measured traffic | 7.6 |
| Scour-critical bridge share | 20 | 0.0% | 0.0 |
| Average age vs national baseline | 10 | 41 years vs 48 nationally | 0.0 |
| Traffic-data completeness | 5 | 861,225 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 | 15.6% |
| State Poor-Condition Share | 9.5% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 0.0% |
| Average Bridge Age | 41 years |
| Poor-Condition Traffic Exposure | 87,405 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Macon County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| US 36(fap 320) over Lake Shore Dr(u 7390 | Poor condition + traffic exposure | Poor | 20,900 | 1954 |
| Lost Bridge(fau 73 over Lake Decatur | Poor condition + traffic exposure | Poor | 9,000 | 1961 |
| I-72 (wb) over Fa320 (il-121) & Cn Rr | Poor condition + traffic exposure | Poor | 7,000 | 1976 |
| I-72 (wb) over Stevens Creek | Poor condition + traffic exposure | Poor | 6,400 | 1974 |
| I-72 (eb) over Fa320 (il-121) & Cn Rr | Poor condition + traffic exposure | Poor | 6,400 | 1976 |
| Fau 7403(ch 30) over Finley Creek | Poor condition + traffic exposure | Poor | 6,300 | 1977 |
| Garfield Av(fau 73 over Il 121(fap 320) | Poor condition + traffic exposure | Poor | 5,100 | 1965 |
| Ch 30(fau 7403) over Sand Creek Trib | Poor condition + traffic exposure | Poor | 4,550 | 1986 |
| Fau 7355 over Lake Decatur | Poor condition + traffic exposure | Poor | 2,200 | 1957 |
| Fau 7355(ch 24) over Lake Decatur | Poor condition + traffic exposure | Poor | 2,200 | 1957 |
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.