Iron County Bridge Report Card
Iron County scores 14 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Iron County, Michigan
Iron County has 54 bridges in the National Bridge Inventory, with 12 rated poor and 12 rated scour-critical. Its poor-condition share of 22.2% is above the 11.0% statewide average. Poor-condition bridges carry about 15,459 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Iron County a Bridge Condition Exposure Score of 14/100 (F). The county has 54 bridges in the National Bridge Inventory, including 12 in poor condition and 12 rated scour-critical. Poor-condition bridges carry about 15,459 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 | 22.2% | 40.0 |
| Poor-condition traffic exposure | 25 | 29.5% of measured traffic | 22.1 |
| Scour-critical bridge share | 20 | 22.2% | 20.0 |
| Average age vs national baseline | 10 | 57 years vs 48 nationally | 3.7 |
| Traffic-data completeness | 5 | 52,462 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 | 22.2% |
| State Poor-Condition Share | 11.0% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 22.2% |
| Average Bridge Age | 57 years |
| Poor-Condition Traffic Exposure | 15,459 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Iron County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| M-69 over Michigamme River | Poor condition + traffic exposure | Poor | 1,571 | 1931 |
| Chicagon Mine RD over Chicagon Creek | Poor condition + traffic exposure | Poor | 142 | 1900 |
| Fas 927 over Paint River | Poor condition + traffic exposure | Poor | 133 | 1962 |
| Fas 303 Idlewild over Fortune Creek | Poor condition + traffic exposure | Poor | 130 | 1921 |
| Old US 141 over Hemlock River | Poor condition + traffic exposure | Poor | 103 | 1924 |
| W Genesee(old Us2) over Iron River Buried | Poor condition + traffic exposure | Poor | 8,200 | 1918 |
| Us-2 over Chicagoan Creek | Poor condition + traffic exposure | Poor | 3,653 | 1929 |
| Us-141 over Hemlock River | Poor condition + traffic exposure | Poor | 1,046 | 1971 |
| Fh 16 over No Br Paint River | Poor condition + traffic exposure | Poor | 156 | 1955 |
| Fh 16 over So Br Paint River | Poor condition + traffic exposure | Poor | 156 | 1955 |
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.