St. Charles County Bridge Report Card
St. Charles County scores 97 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
St. Charles County, Louisiana
St. Charles County has 82 bridges in the National Bridge Inventory, with 1 rated poor and 0 rated scour-critical. Its poor-condition share of 1.2% is at or below the 11.2% statewide average. Poor-condition bridges carry about 1,544 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives St. Charles County a Bridge Condition Exposure Score of 97/100 (A). The county has 82 bridges in the National Bridge Inventory, including 1 in poor condition and 0 rated scour-critical. Poor-condition bridges carry about 1,544 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 | 1.2% | 2.4 |
| Poor-condition traffic exposure | 25 | 0.1% of measured traffic | 0.1 |
| Scour-critical bridge share | 20 | 0.0% | 0.0 |
| Average age vs national baseline | 10 | 45 years vs 48 nationally | 0.0 |
| Traffic-data completeness | 5 | 1,785,465 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 | 1.2% |
| State Poor-Condition Share | 11.2% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 0.0% |
| Average Bridge Age | 45 years |
| Poor-Condition Traffic Exposure | 1,544 vehicles/day |
Bridges to Watch
Top Bridges to Watch in St. Charles County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| La0631 over Drain Canal | Poor condition + traffic exposure | Poor | 1,544 | 1962 |
| I0310 over Swamp | High traffic | Good | 56,783 | 1992 |
| Us0090 over Drain Canal | High traffic | Fair | 49,920 | 1953 |
| Us0090 over Sellers Canal | High traffic | Fair | 49,920 | 1953 |
| Us0090 over Drain Ditch | High traffic | Good | 49,920 | 1999 |
| Us0090 over Davis Pond Diversion | High traffic | Good | 49,920 | 2002 |
| Us0090 over US 90 Turnarounds | High traffic | Good | 49,920 | 2013 |
| I0010 over Bonnet Carre Spillway | High traffic | Fair | 48,723 | 1972 |
| I0310 over M. P. Rr | High traffic | Fair | 47,396 | 1979 |
| I0310 over Ramp"c" From I 310 SB | High traffic | Good | 47,396 | 1979 |
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.