St. Mary County Bridge Report Card
St. Mary County scores 75 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
St. Mary County, Louisiana
St. Mary County has 124 bridges in the National Bridge Inventory, with 9 rated poor and 2 rated scour-critical. Its poor-condition share of 7.3% is at or below the 11.2% statewide average. Poor-condition bridges carry about 65,529 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives St. Mary County a Bridge Condition Exposure Score of 75/100 (C). The county has 124 bridges in the National Bridge Inventory, including 9 in poor condition and 2 rated scour-critical. Poor-condition bridges carry about 65,529 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 | 7.3% | 14.5 |
| Poor-condition traffic exposure | 25 | 8.4% of measured traffic | 6.3 |
| Scour-critical bridge share | 20 | 1.6% | 3.2 |
| Average age vs national baseline | 10 | 51 years vs 48 nationally | 1.1 |
| Traffic-data completeness | 5 | 784,350 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 | 7.3% |
| State Poor-Condition Share | 11.2% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 1.6% |
| Average Bridge Age | 51 years |
| Poor-Condition Traffic Exposure | 65,529 vehicles/day |
Bridges to Watch
Top Bridges to Watch in St. Mary County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| La0182 over Atchaf.r/berwick Bay | Poor condition + traffic exposure | Poor | 12,788 | 1933 |
| Us0090 over Wax Lake Outlet | Poor condition + traffic exposure | Poor | 10,035 | 1975 |
| La0083 over Bayou Choupique | Poor condition + traffic exposure | Poor | 10,148 | 1978 |
| Us0090 over Bayou Ramos | Poor condition + traffic exposure | Poor | 10,035 | 1994 |
| Us0090 over Bayou Ramos | Poor condition + traffic exposure | Poor | 7,885 | 1994 |
| Us0090 over Ramos Bayou | Poor condition + traffic exposure | Poor | 7,504 | 1932 |
| La0182 over Charenton | Poor condition + traffic exposure | Poor | 6,242 | 1941 |
| La0324 over Bayou Teche | Poor condition + traffic exposure | Poor | 883 | 1941 |
| La0087 over Creek | Poor condition + traffic exposure | Poor | 9 | 1952 |
| Us0090 over Ramp I | High traffic | Good | 24,384 | 1984 |
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.