Antrim County Bridge Report Card
Antrim County scores 44 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Antrim County, Michigan
Antrim County has 15 bridges in the National Bridge Inventory, with 2 rated poor and 3 rated scour-critical. Its poor-condition share of 13.3% is above the 11.0% statewide average. Poor-condition bridges carry about 3,704 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Antrim County a Bridge Condition Exposure Score of 44/100 (F). The county has 15 bridges in the National Bridge Inventory, including 2 in poor condition and 3 rated scour-critical. Poor-condition bridges carry about 3,704 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 | 13.3% | 26.7 |
| Poor-condition traffic exposure | 25 | 12.3% of measured traffic | 9.2 |
| Scour-critical bridge share | 20 | 20.0% | 20.0 |
| Average age vs national baseline | 10 | 45 years vs 48 nationally | 0.0 |
| Traffic-data completeness | 5 | 30,105 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 | 13.3% |
| State Poor-Condition Share | 11.0% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 20.0% |
| Average Bridge Age | 45 years |
| Poor-Condition Traffic Exposure | 3,704 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Antrim County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| Cayuga Street over Intermediate River | Poor condition + traffic exposure | Poor | 3,000 | 1977 |
| Dexter Street over Elk River | Poor condition + traffic exposure | Poor | 704 | 1979 |
| Route 593 over Clam Lake | Scour-critical foundation rating | Fair | 1,400 | 1958 |
| Penny Bridge RD over Landslide Creek | Scour-critical foundation rating | Good | 80 | 1986 |
| Graves Crossing RD over Jordan River | Scour-critical foundation rating | Good | 10 | 1991 |
| Us-31 over Elk River | High traffic | Fair | 11,959 | 1953 |
| M-88|n Bridge ST over Intermediate River | High traffic | Fair | 5,984 | 1931 |
| Derenzy Road over Cedar River | High traffic | Good | 3,150 | 1988 |
| Route 593 over Torch River | High traffic | Fair | 2,040 | 1971 |
| State Street over Intermediate River | High traffic | Fair | 900 | 1976 |
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.