St. Lawrence County Bridge Report Card
St. Lawrence County scores 73 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
St. Lawrence County, New York
St. Lawrence County has 313 bridges in the National Bridge Inventory, with 18 rated poor and 22 rated scour-critical. Its poor-condition share of 5.8% is at or below the 9.9% statewide average. Poor-condition bridges carry about 7,768 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives St. Lawrence County a Bridge Condition Exposure Score of 73/100 (C). The county has 313 bridges in the National Bridge Inventory, including 18 in poor condition and 22 rated scour-critical. Poor-condition bridges carry about 7,768 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 | 5.8% | 11.5 |
| Poor-condition traffic exposure | 25 | 1.9% of measured traffic | 1.4 |
| Scour-critical bridge share | 20 | 7.0% | 14.1 |
| Average age vs national baseline | 10 | 48 years vs 48 nationally | 0.2 |
| Traffic-data completeness | 5 | 414,622 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 | 5.8% |
| State Poor-Condition Share | 9.9% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 7.0% |
| Average Bridge Age | 48 years |
| Poor-Condition Traffic Exposure | 7,768 vehicles/day |
Bridges to Watch
Top Bridges to Watch in St. Lawrence County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| Ames Road over Trout Brook | Poor condition + traffic exposure | Poor | 314 | 1950 |
| County Road 54 over Allen Brook | Poor condition + traffic exposure | Poor | 253 | 1928 |
| Blanchard Hill RD over Plumb Brook | Poor condition + traffic exposure | Poor | 161 | 1903 |
| Mcewen Road over Allen Brook | Poor condition + traffic exposure | Poor | 125 | 1984 |
| Limkiln Road over Boland Creek | Poor condition + traffic exposure | Poor | 41 | 1996 |
| Vrooman Road over Big Creek | Poor condition + traffic exposure | Poor | 7 | 1978 |
| RTE 812 over Can.queens Hwy.2 St.law | Poor condition + traffic exposure | Poor | 3,033 | 1960 |
| County Road 43 over Dodge Creek | Poor condition + traffic exposure | Poor | 1,155 | 1983 |
| Eddy Pyrites Road over Harrison Crk Ovfl | Poor condition + traffic exposure | Poor | 620 | 1931 |
| RTE 58 over Fish Creek | Poor condition + traffic exposure | Poor | 522 | 1933 |
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.