Charlevoix County Bridge Report Card
Charlevoix County scores 63 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Charlevoix County, Michigan
Charlevoix County has 18 bridges in the National Bridge Inventory, with 2 rated poor and 1 rated scour-critical. Its poor-condition share of 11.1% is above the 11.0% statewide average. Poor-condition bridges carry about 1,283 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Charlevoix County a Bridge Condition Exposure Score of 63/100 (D). The county has 18 bridges in the National Bridge Inventory, including 2 in poor condition and 1 rated scour-critical. Poor-condition bridges carry about 1,283 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 | 11.1% | 22.2 |
| Poor-condition traffic exposure | 25 | 2.5% of measured traffic | 1.9 |
| Scour-critical bridge share | 20 | 5.6% | 11.1 |
| Average age vs national baseline | 10 | 53 years vs 48 nationally | 2.0 |
| Traffic-data completeness | 5 | 51,866 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 | 11.1% |
| State Poor-Condition Share | 11.0% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 5.6% |
| Average Bridge Age | 53 years |
| Poor-Condition Traffic Exposure | 1,283 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Charlevoix County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| Iron Bridge Road over Sturgeon River | Poor condition + traffic exposure | Poor | 3 | 1900 |
| Springvale Road over Bear River | Poor condition + traffic exposure | Poor | 1,280 | 1950 |
| Us-31 over Pine River | High traffic | Fair | 15,321 | 1949 |
| Us-131 over Boyne River | High traffic | Fair | 6,736 | 1947 |
| M-75|s East ST over Boyne River | High traffic | Fair | 6,546 | 1974 |
| Park Street over Boyne River | High traffic | Fair | 5,000 | 1991 |
| M-32|water ST over S Arm Lake Charlevoix | High traffic | Fair | 4,600 | 1959 |
| Lake Street over Boyne River | High traffic | Fair | 3,000 | 1959 |
| M-32|maple ST over Deer Creek | High traffic | Fair | 2,665 | 1949 |
| Thumb Lake Road over N Br Boyne River | High traffic | Good | 2,545 | 2003 |
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.