Bridge conditions in Columbia County, Washington
86 inventoried bridges · 9 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
About one in 10 bridges in Columbia County is rated in poor condition: 9 of 86 on the federal inventory, one of the higher shares in Washington.
- 9 of the 86 bridges in Columbia County, Washington, are rated in poor condition (10.5%) in the 2025 National Bridge Inventory, as of .
- 38 bridges (44.2%) are rated good and 39 (45.3%) fair.
- The median Columbia County bridge was built in 1974.
- The busiest poor-rated bridge is US 12 over Warehouse Yard (built 1933), carrying about 2,442 vehicles a day.
Good 44.2% · Fair 45.3% · Poor 10.5% of 86 bridges
Bridges rated poor
Every bridge in the county with a poor rating, busiest first. Poor means a major component is rated 4 or lower on FHWA's 0-9 scale; it is a repair flag, not a closure notice.
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 12 over Warehouse Yard | 1933 | 2,442 | Poor |
| US 12 over Tucannon River | 1967 | 1,884 | Poor |
| SR 261 over Snake River | 1927 | 485 | Poor |
| Kellog Hollow Rd. over Tucannon River | 1962 | 350 | Poor |
| Tucannon Road over Tucannon River | 1968 | 200 | Poor |
| Rose Gulch Road over Touchet River | 1963 | 150 | Poor |
| South Patit Road over South Patit Creek | 1962 | 75 | Poor |
| Baileysburg Road over North Touchet River | 1975 | 50 | Poor |
| King Grade over Tucannon River | 1974 | 25 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 12 over Touchet River | 1966 | 5,627 | Good |
| US 12 over Touchet River | 1966 | 4,556 | Good |
| US 12 over Warehouse Yard | 1933 | 2,442 | Poor |
| US 12 over UPRR | 1977 | 2,442 | Fair |
| US 12 over Patit Creek | 1933 | 2,218 | Fair |
| US 12 over Whetstone Creek | 2021 | 1,993 | Good |
| US 12 over Tucannon River | 1967 | 1,884 | Poor |
| Patit Road over Patit Creek | 2002 | 600 | Fair |
| SR 261 over Pataha Creek | 1971 | 547 | Good |
| South Touchet Road over North Touchet River | 1997 | 515 | Fair |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
All of Washington: Washington bridge conditions by county · every download on the data page.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.