Bridge conditions in Cowlitz County, Washington
161 inventoried bridges · 6 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Cowlitz County tracks close to typical: 6 of its 161 inventoried bridges (3.7%) are rated poor, against a national rate of about 7%.
- 6 of the 161 bridges in Cowlitz County, Washington, are rated in poor condition (3.7%) in the 2025 National Bridge Inventory, as of .
- 75 bridges (46.6%) are rated good and 80 (49.7%) fair.
- The median Cowlitz County bridge was built in 1973.
- The busiest poor-rated bridge is I-5 over Log Dump Rd & Bn Ry (built 1972), carrying about 33,912 vehicles a day.
Good 46.6% · Fair 49.7% · Poor 3.7% of 161 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 |
|---|---|---|---|
| I-5 over Log Dump Rd & Bn Ry | 1972 | 33,912 | Poor |
| SR 411 over Cowlitz River | 1963 | 6,753 | Poor |
| Old 99 South over Owl Creek | 1922 | 6,500 | Poor |
| SR 503 over Jim Creek | 1945 | 1,969 | Poor |
| SR 504 over N Fk Toutle River | 1965 | 955 | Poor |
| Mill Creek Rd over Mill Creek | 1958 | 700 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-5 over Bn Ry | 1972 | 37,599 | Fair |
| I-5 over Kalama River | 1971 | 37,279 | Good |
| I-5 over Kalama River | 1970 | 37,279 | Good |
| I-5 over Owl Creek | 1972 | 36,932 | Good |
| I-5 over Owl Creek | 1972 | 36,932 | Good |
| I-5 over Todd Rd | 1971 | 35,483 | Good |
| I-5 over Todd Rd | 1971 | 35,483 | Good |
| I-5 over Elm St | 1968 | 34,170 | Fair |
| I-5 over Elm St | 1968 | 34,170 | Good |
| I-5 over Log Dump Rd | 1955 | 33,912 | 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.