Historic Bridges in Oregon
790 bridges built before 1951 in Oregon still in service today.
Bridges Built Before 1951
The United States has 790 bridges in Oregon 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 |
|---|---|---|---|---|---|
| NORTH FORK YACHATS RIVER | Oregon | Fair | 1938 | 88 | 10 |
| MCKENZIE RIVER | Oregon | Fair | 1938 | 88 | 999 |
| MOHAWK RIVER | Oregon | Fair | 1938 | 88 | 227 |
| WALLA WALLA RIVER | Oregon | Fair | 1938 | 88 | 856 |
| A CANAL | Oregon | Fair | 1938 | 88 | 6,056 |
| FALL CREEK | Oregon | Fair | 1938 | 88 | 129 |
| BONNEVILLE DAM | Oregon | Fair | 1938 | 88 | 83 |
| Wilson River | Oregon | Poor | 1939 | 87 | 5,092 |
| North Fork Quartz Creek | Oregon | Fair | 1939 | 87 | 6,082 |
| Nehalem River & Hwy 103 | Oregon | Fair | 1939 | 87 | 6,082 |
| MULE SHOE CREEK | Oregon | Good | 1939 | 87 | 406 |
| CBRL | Oregon | Fair | 1939 | 87 | 10,903 |
| INDIAN CREEK | Oregon | Fair | 1939 | 87 | 1,893 |
| JOHN DAY R(PRAIRIE CITY) | Oregon | Fair | 1939 | 87 | 1,893 |
| DIXIE CRK (PRAIRIE CITY) | Oregon | Fair | 1939 | 87 | 2,104 |
| YAMHILL RIVER | Oregon | Fair | 1939 | 87 | 6,365 |
| Rooster Rock Culvert | Oregon | Fair | 1939 | 87 | 29,509 |
| Necanicum River | Oregon | Fair | 1939 | 87 | 6,279 |
| CRABTREE CREEK | Oregon | Fair | 1939 | 87 | 371 |
| LOUIS CREEK | Oregon | Fair | 1939 | 87 | 600 |
| SOUTH MYRTLE CREEK | Oregon | Fair | 1939 | 87 | 260 |
| Marys River | Oregon | Fair | 1939 | 87 | 75 |
| B-55 OVER JOHNSON CREEK | Oregon | Fair | 1939 | 87 | 1,389 |
| JACKSON CR/SENIC AVE | Oregon | Fair | 1939 | 87 | 1,945 |
| JOHNSON CREEK | Oregon | Good | 1939 | 87 | 137 |
| A LINE CANAL | Oregon | Fair | 1939 | 87 | 146 |
| CENTER CANAL | Oregon | Fair | 1940 | 86 | 1 |
| Half Viaduct | Oregon | Fair | 1940 | 86 | 5,743 |
| Half Viaduct | Oregon | Fair | 1940 | 86 | 5,743 |
| Half Viaduct | Oregon | Good | 1940 | 86 | 5,743 |
| Half Viaduct | Oregon | Fair | 1940 | 86 | 5,743 |
| Half Viaduct | Oregon | Good | 1940 | 86 | 5,743 |
| Half Viaduct | Oregon | Good | 1940 | 86 | 5,743 |
| CATHERINE CREEK (PARK) | Oregon | Fair | 1940 | 86 | 230 |
| Nehalem River | Oregon | Fair | 1940 | 86 | 6,383 |
| CALAPOOIA RIVER | Oregon | Fair | 1940 | 86 | 5,562 |
| Willamette River | Oregon | Fair | 1940 | 86 | 19,211 |
| City Street & UPRR | Oregon | Fair | 1940 | 86 | 18,518 |
| HWY 31 (US 20) | Oregon | Fair | 1940 | 86 | 18,518 |
| Devils Lake Fk Wilson R | Oregon | Fair | 1940 | 86 | 5,662 |
| Santiam Canal | Oregon | Fair | 1940 | 86 | 21,741 |
| Cox Creek | Oregon | Good | 1940 | 86 | 29,551 |
| PNWR | Oregon | Fair | 1940 | 86 | 35,507 |
| FANNO CREEK | Oregon | Fair | 1940 | 86 | 35,507 |
| E FORK BIRCH CREEK | Oregon | Fair | 1940 | 86 | 3,218 |
| Alsea River | Oregon | Fair | 1940 | 86 | 1,476 |
| Devils Lake Fk Wilson R | Oregon | Fair | 1940 | 86 | 4,854 |
| West Fork Dairy Creek | Oregon | Poor | 1940 | 86 | 9,574 |
| Partial Viaduct | Oregon | Fair | 1940 | 86 | 19,677 |
| CENTRAL OREGON CANAL | Oregon | Fair | 1940 | 86 | 12,150 |
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.