Bay County Bridge Report Card
Bay County scores 40 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Bay County, Michigan
Bay County has 166 bridges in the National Bridge Inventory, with 27 rated poor and 22 rated scour-critical. Its poor-condition share of 16.3% is above the 11.0% statewide average. Poor-condition bridges carry about 83,031 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Bay County a Bridge Condition Exposure Score of 40/100 (F). The county has 166 bridges in the National Bridge Inventory, including 27 in poor condition and 22 rated scour-critical. Poor-condition bridges carry about 83,031 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 | 16.3% | 32.5 |
| Poor-condition traffic exposure | 25 | 7.5% of measured traffic | 5.6 |
| Scour-critical bridge share | 20 | 13.3% | 20.0 |
| Average age vs national baseline | 10 | 51 years vs 48 nationally | 1.4 |
| Traffic-data completeness | 5 | 1,113,853 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 | 16.3% |
| State Poor-Condition Share | 11.0% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 13.3% |
| Average Bridge Age | 51 years |
| Poor-Condition Traffic Exposure | 83,031 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Bay County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| M-13 & M-84 over E Channel Saginaw River | Poor condition + traffic exposure | Poor | 16,380 | 1938 |
| Fraser ST over Kawkawlin River | Poor condition + traffic exposure | Poor | 784 | 1959 |
| Eight Mile Road over N Br Kawkawlin River | Poor condition + traffic exposure | Poor | 493 | 1971 |
| Kaiser-tower Road over Fraser-garfield Drain | Poor condition + traffic exposure | Poor | 486 | 1936 |
| Fraser Road over Railroad Drain | Poor condition + traffic exposure | Poor | 220 | 1937 |
| Russell Road over Constant-durussell Drain | Poor condition + traffic exposure | Poor | 106 | 1930 |
| Nolet Road over Quanicassee River | Poor condition + traffic exposure | Poor | 96 | 1924 |
| I-75 NB over Hesr | Poor condition + traffic exposure | Poor | 44,350 | 1960 |
| Us-10 WB over E Patrick Rd(union Rd) | Poor condition + traffic exposure | Poor | 8,325 | 1960 |
| Salzburg RD over M-47 | Poor condition + traffic exposure | Poor | 2,670 | 1966 |
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.