Historic Bridges in Louisiana
614 bridges built before 1951 in Louisiana still in service today.
Bridges Built Before 1951
The United States has 614 bridges in Louisiana built before 1951 that remain in active service. These structures are 75+ years old — many predate modern engineering codes and were not designed for today's traffic volumes and vehicle weights. The average design life of a bridge is 50 years, making these aging structures a significant infrastructure concern.
| Bridge | State | Condition | Year Built | Age (Years) | ADT |
|---|---|---|---|---|---|
| DRAIN CANAL | Louisiana | Good | 1940 | 86 | 28,780 |
| DRAIN CANAL | Louisiana | Fair | 1940 | 86 | 28,780 |
| BAYOU LAFOURCHE | Louisiana | Poor | 1940 | 86 | 2,380 |
| I-10 | Louisiana | Poor | 1940 | 86 | 19,200 |
| DRAIN CANAL | Louisiana | Fair | 1940 | 86 | 25,051 |
| SELLERS CANAL | Louisiana | Fair | 1940 | 86 | 25,051 |
| BAYOU | Louisiana | Fair | 1940 | 86 | 79 |
| CREEK | Louisiana | Poor | 1940 | 86 | 1,518 |
| KCS RAILROAD | Louisiana | Fair | 1940 | 86 | 150 |
| CROSS BAYOU | Louisiana | Poor | 1940 | 86 | 5,484 |
| CREEK | Louisiana | Good | 1940 | 86 | 14,847 |
| MAHLIN BAYOU | Louisiana | Good | 1940 | 86 | 9,576 |
| CREEK | Louisiana | Fair | 1940 | 86 | 4,492 |
| ICG RR | Louisiana | Poor | 1940 | 86 | 5,484 |
| ICG RR | Louisiana | Poor | 1940 | 86 | 5,484 |
| STEEP GULLY BRANCH | Louisiana | Poor | 1940 | 86 | 77 |
| MISSISSIPPI RIVER | Louisiana | Fair | 1940 | 86 | 21,661 |
| US 61-SCENIC | Louisiana | Poor | 1940 | 86 | 12,262 |
| US 61-SCENIC | Louisiana | Poor | 1940 | 86 | 26,376 |
| WARD CREEK | Louisiana | Fair | 1940 | 86 | 13,549 |
| LA 415/M P RR @ LOBDELL | Louisiana | Poor | 1940 | 86 | 12,262 |
| DRAINAGE CHANNEL | Louisiana | Fair | 1940 | 86 | 3 |
| US 90 BUS @ AVONDALE | Louisiana | Fair | 1941 | 85 | 49,920 |
| BAYOU TERREBONNE | Louisiana | Fair | 1941 | 85 | 8,922 |
| LITTLE CAILLOU | Louisiana | Fair | 1941 | 85 | 8,922 |
| BAYOU TECHE | Louisiana | Fair | 1941 | 85 | 3,834 |
| CHARENTON | Louisiana | Poor | 1941 | 85 | 6,242 |
| BAYOU TECHE | Louisiana | Poor | 1941 | 85 | 883 |
| TEN MILE CREEK TRIB. | Louisiana | Good | 1941 | 85 | 2,773 |
| SALINE BAYOU RELIEF | Louisiana | Poor | 1941 | 85 | 310 |
| MILL CREEK | Louisiana | Poor | 1941 | 85 | 310 |
| CREEK | Louisiana | Good | 1941 | 85 | 5,116 |
| SLOUGH | Louisiana | Good | 1941 | 85 | 11,418 |
| CONC BOX XING | Louisiana | Good | 1942 | 84 | 23,719 |
| CONC BOX XING | Louisiana | Good | 1942 | 84 | 23,719 |
| CONC BOX XING | Louisiana | Good | 1942 | 84 | 23,719 |
| CONC BOX XING | Louisiana | Good | 1942 | 84 | 23,719 |
| DEBLANC COULEE | Louisiana | Fair | 1942 | 84 | 553 |
| BAYOU TECHE ST M. | Louisiana | Fair | 1942 | 84 | 8,684 |
| CREEK | Louisiana | Poor | 1942 | 84 | 1,020 |
| SALS BRANCH | Louisiana | Fair | 1942 | 84 | 2,917 |
| CREEK | Louisiana | Fair | 1943 | 83 | 3,472 |
| CREEK | Louisiana | Fair | 1943 | 83 | 3,472 |
| CLARKE BAYOU REL | Louisiana | Fair | 1943 | 83 | 3,472 |
| CLARKE BAYOU | Louisiana | Fair | 1943 | 83 | 3,472 |
| CANEY BRANCH | Louisiana | Fair | 1943 | 83 | 3,472 |
| DRAIN | Louisiana | Good | 1943 | 83 | 3,472 |
| CREEK | Louisiana | Fair | 1943 | 83 | 396 |
| CREEK | Louisiana | Good | 1943 | 83 | 7,277 |
| TCHEFUNCTA RIVER | Louisiana | Fair | 1943 | 83 | 1,162 |
About Historic Bridge Data
Bridges built before 1951 are classified as historic in this database. Many were designed to 1940s standards with lower load limits and narrower lanes. While FHWA requires regular inspections of all bridges regardless of age, older structures often require more frequent monitoring and rehabilitation investment.