Bridge conditions in Lewis County, Washington
420 inventoried bridges · 17 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
The federal inventory lists 420 bridges in Lewis County: 209 rated good, 194 fair, and 17 poor.
- 17 of the 420 bridges in Lewis County, Washington, are rated in poor condition (4.0%) in the 2025 National Bridge Inventory, as of .
- 209 bridges (49.8%) are rated good and 194 (46.2%) fair.
- The median Lewis County bridge was built in 1964.
- The busiest poor-rated bridge is I-5 over Cowlitz River (built 1953), carrying about 21,828 vehicles a day.
Good 49.8% · Fair 46.2% · Poor 4.0% of 420 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 Cowlitz River | 1953 | 21,828 | Poor |
| I-5 over Lacamas CR Drews Pr Rd | 1953 | 21,041 | Poor |
| Chamber Way over Bn RR & N Natl Ave | 1952 | 13,223 | Poor |
| SR 507 over Skookumchuck River | 1928 | 8,908 | Poor |
| SR 7 over S Fk Tilton River | 1938 | 2,625 | Poor |
| SR 7 over Abandoned Railroad | 1944 | 2,625 | Poor |
| US 12 over Coal Creek | 1930 | 2,494 | Poor |
| US 12 over Clear Fk of Cowlitz R | 1972 | 2,452 | Poor |
| US 12 over Purcell Creek | 1971 | 2,452 | Poor |
| SR 7 over Tilton River | 1931 | 2,351 | Poor |
| Stevens Canyon Roa over Stevens Creek | 1940 | 1,400 | Poor |
| Stevens Canyon Roa over Ravine | 1952 | 1,375 | Poor |
| Ferrier Rd over Olequa Creek | 1924 | 215 | Poor |
| Ceres Hill Road over Chehalis River | 1948 | 144 | Poor |
| Davison Rd. over Tilton River | 1924 | 117 | Poor |
| Nfsr 7003000 over Eagle Creek | 1970 | 50 | Poor |
| Nfsr 7003000 over West Fork Tilton | 1970 | 50 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-5 over Salzer Creek | 1951 | 38,131 | Fair |
| I-5 over Cw Ry | 1953 | 36,296 | Fair |
| I-5 over Np Ry & Dillenbaugh CR | 1954 | 36,296 | Fair |
| I-5 over RR & Reynolds Rd. | 2013 | 34,754 | Good |
| I-5 over Blakeslee Jct RR | 2015 | 34,754 | Good |
| I-5 over Dillenbaugh Creek | 1952 | 32,739 | Good |
| I-5 over SR 507 Mellen St | 1951 | 32,590 | Fair |
| I-5 over Dillenbaugh Creek | 1965 | 30,397 | Good |
| I-5 over Newaukum River | 1952 | 29,186 | Fair |
| I-5 over Newaukum River | 1952 | 29,186 | 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.