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 |
|---|---|---|---|---|---|
| BAYOU TECHE JEAN. | Louisiana | Poor | 1944 | 82 | 496 |
| DIVERSION CANAL | Louisiana | Fair | 1944 | 82 | 17,561 |
| BAYOU RAPIDES | Louisiana | Fair | 1944 | 82 | 42,243 |
| DIVERSION CANAL | Louisiana | Fair | 1944 | 82 | 10,946 |
| KINCAID LAKE | Louisiana | Fair | 1944 | 82 | 9,482 |
| DRAIN | Louisiana | Good | 1944 | 82 | 9,482 |
| DRAIN | Louisiana | Good | 1944 | 82 | 22,385 |
| DRAIN | Louisiana | Good | 1944 | 82 | 22,385 |
| DRAIN | Louisiana | Good | 1944 | 82 | 22,385 |
| BAYOU TORO | Louisiana | Fair | 1944 | 82 | 3,483 |
| CREEK | Louisiana | Good | 1944 | 82 | 7,336 |
| BLUE BRANCH | Louisiana | Poor | 1944 | 82 | 482 |
| BOGGY BRANCH | Louisiana | Poor | 1944 | 82 | 482 |
| LITTLE BRUSHY CREEK | Louisiana | Poor | 1944 | 82 | 482 |
| BRUSHY CREEK | Louisiana | Poor | 1944 | 82 | 482 |
| TEN MILE CREEK | Louisiana | Poor | 1944 | 82 | 482 |
| DRAIN | Louisiana | Poor | 1944 | 82 | 482 |
| PATOUT CANAL | Louisiana | Poor | 1945 | 81 | 3,125 |
| DINDE BAYOU | Louisiana | Poor | 1945 | 81 | 2,625 |
| MAPLE FORK | Louisiana | Fair | 1945 | 81 | 22,287 |
| CREEK | Louisiana | Good | 1945 | 81 | 6,456 |
| BLACK BAYOU RELIEF | Louisiana | Fair | 1945 | 81 | 12,669 |
| BLACK BAYOU | Louisiana | Good | 1945 | 81 | 12,669 |
| LITTLE BLACK BAY | Louisiana | Good | 1945 | 81 | 6,071 |
| CREEK | Louisiana | Fair | 1945 | 81 | 6,071 |
| MORGANZA FLDWY | Louisiana | Fair | 1945 | 81 | 12,942 |
| BAYOU BLACK | Louisiana | Fair | 1946 | 80 | 3,687 |
| CREEK | Louisiana | Fair | 1946 | 80 | 1,786 |
| TRIBUTARY TO STUMPY BAYO | Louisiana | Fair | 1947 | 79 | 31 |
| DRY CREEK | Louisiana | Fair | 1947 | 79 | 1,806 |
| CYPRESS BRANCH | Louisiana | Fair | 1947 | 79 | 690 |
| CYPRESS BAYOU | Louisiana | Fair | 1947 | 79 | 472 |
| PILLARS CREEK | Louisiana | Fair | 1947 | 79 | 226 |
| PILLARS CREEK | Louisiana | Fair | 1947 | 79 | 226 |
| WIGGINS BAYOU | Louisiana | Fair | 1947 | 79 | 226 |
| WIGGINS BAYOU RELIEF | Louisiana | Fair | 1947 | 79 | 226 |
| CREEK | Louisiana | Good | 1947 | 79 | 2,252 |
| BAYOU BARATARIA | Louisiana | Poor | 1948 | 78 | 1,254 |
| COMMMERICAL CANAL | Louisiana | Fair | 1948 | 78 | 3,451 |
| VERMILION RIVER | Louisiana | Fair | 1948 | 78 | 16,800 |
| VERMILION R @ MILTON | Louisiana | Fair | 1948 | 78 | 738 |
| CARENCRO BAYOU | Louisiana | Fair | 1948 | 78 | 16,573 |
| FOUR MILE BAYOU RELIEF | Louisiana | Fair | 1948 | 78 | 856 |
| FOUR MILE BAYOU RELIEF | Louisiana | Fair | 1948 | 78 | 856 |
| FOUR MILE BAYOU | Louisiana | Fair | 1948 | 78 | 856 |
| LAYS BAYOU | Louisiana | Fair | 1948 | 78 | 5,237 |
| LOWE CREEK | Louisiana | Fair | 1948 | 78 | 1,590 |
| CREEK | Louisiana | Fair | 1948 | 78 | 1,382 |
| CREEK | Louisiana | Fair | 1948 | 78 | 1,382 |
| BIG BRANCH | Louisiana | Fair | 1948 | 78 | 40 |
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.