Alger County Bridge Report Card
Alger County scores 40 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Alger County, Michigan
Alger County has 53 bridges in the National Bridge Inventory, with 7 rated poor and 7 rated scour-critical. Its poor-condition share of 13.2% is above the 11.0% statewide average. Poor-condition bridges carry about 3,678 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Alger County a Bridge Condition Exposure Score of 40/100 (F). The county has 53 bridges in the National Bridge Inventory, including 7 in poor condition and 7 rated scour-critical. Poor-condition bridges carry about 3,678 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 | 13.2% | 26.4 |
| Poor-condition traffic exposure | 25 | 6.7% of measured traffic | 5.0 |
| Scour-critical bridge share | 20 | 13.2% | 20.0 |
| Average age vs national baseline | 10 | 70 years vs 48 nationally | 8.7 |
| Traffic-data completeness | 5 | 54,857 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 | 13.2% |
| State Poor-Condition Share | 11.0% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 13.2% |
| Average Bridge Age | 70 years |
| Poor-Condition Traffic Exposure | 3,678 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Alger County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| Woodland Road over Au Train River | Poor condition | Poor | 0 | 1910 |
| M-28 over Prairie Creek | Poor condition + traffic exposure | Poor | 1,973 | 1947 |
| Us-41 over W Br Whitefish River | Poor condition + traffic exposure | Poor | 1,640 | 1936 |
| King Road over Whitefish River | Poor condition + traffic exposure | Poor | 50 | 1910 |
| Alec Johnson Road over Whitefish River | Poor condition + traffic exposure | Poor | 5 | 1910 |
| Kivamaki Road over Whitefish River | Poor condition + traffic exposure | Poor | 5 | 1910 |
| Paulson Road over Dexter Creek | Poor condition + traffic exposure | Poor | 5 | 1920 |
| East Munising AVE over Anna River | Scour-critical foundation rating | Fair | 5,715 | 1978 |
| M-28 over Au Train River | Scour-critical foundation rating | Fair | 5,200 | 1932 |
| M-28 over Hickey Creek | Scour-critical foundation rating | Fair | 1,973 | 1947 |
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.