Arenac County Bridge Report Card
Arenac County scores 36 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Arenac County, Michigan
Arenac County has 80 bridges in the National Bridge Inventory, with 12 rated poor and 9 rated scour-critical. Its poor-condition share of 15.0% is above the 11.0% statewide average. Poor-condition bridges carry about 41,344 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Arenac County a Bridge Condition Exposure Score of 36/100 (F). The county has 80 bridges in the National Bridge Inventory, including 12 in poor condition and 9 rated scour-critical. Poor-condition bridges carry about 41,344 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 | 15.0% | 30.0 |
| Poor-condition traffic exposure | 25 | 14.8% of measured traffic | 11.1 |
| Scour-critical bridge share | 20 | 11.2% | 20.0 |
| Average age vs national baseline | 10 | 56 years vs 48 nationally | 3.2 |
| Traffic-data completeness | 5 | 279,762 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 | 15.0% |
| State Poor-Condition Share | 11.0% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 11.2% |
| Average Bridge Age | 56 years |
| Poor-Condition Traffic Exposure | 41,344 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Arenac County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| M-61 over M Br Pine River | Poor condition + traffic exposure | Poor | 4,242 | 1952 |
| Black Road over Big Creek A Drain | Poor condition + traffic exposure | Poor | 30 | 1917 |
| Sterling Road over I-75 NB | Poor condition + traffic exposure | Poor | 14,350 | 1968 |
| I-75 SB over N Branch Pine River | Poor condition + traffic exposure | Poor | 7,138 | 1968 |
| M-61 over M Br Pine River | Poor condition + traffic exposure | Poor | 4,242 | 1952 |
| M-33 over Lake State Rr & Old M-76 | Poor condition + traffic exposure | Poor | 4,124 | 1968 |
| M-33|alger RD over I-75 NB | Poor condition + traffic exposure | Poor | 4,124 | 1968 |
| Old M-76 over North Br Pine River | Poor condition + traffic exposure | Poor | 2,554 | 1932 |
| Foco Road over N Br Pine River | Poor condition + traffic exposure | Poor | 235 | 1974 |
| Mackinaw Road over Augres River | Poor condition + traffic exposure | Poor | 200 | 1985 |
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.