Bridge conditions in Snohomish County, Washington
500 inventoried bridges · 20 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
20 of the 500 bridges the federal inventory lists in Snohomish County are rated poor; the rest split 248 good and 232 fair.
- 20 of the 500 bridges in Snohomish County, Washington, are rated in poor condition (4.0%) in the 2025 National Bridge Inventory, as of .
- 248 bridges (49.6%) are rated good and 232 (46.4%) fair.
- The median Snohomish County bridge was built in 1979.
- The busiest poor-rated bridge is Alderwood Mall Blv over SR 524/196TH St SW (built 1999), carrying about 19,198 vehicles a day.
Good 49.6% · Fair 46.4% · Poor 4.0% of 500 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 |
|---|---|---|---|
| Alderwood Mall Blv over SR 524/196TH St SW | 1999 | 19,198 | Poor |
| SR 529 over Steamboat Slough | 1927 | 16,592 | Poor |
| SR 529 over Union Sl | 1927 | 16,439 | Poor |
| SR 529 over Union Sl | 1954 | 16,439 | Poor |
| SR 529 over Snohomish River | 1927 | 16,286 | Poor |
| SR 529 over Snohomish River | 1954 | 16,286 | Poor |
| SR 203 over Skykomish River | 1957 | 15,153 | Poor |
| SR 203 over Drainage Overflow | 1954 | 12,132 | Poor |
| Locust Way over Swamp Creek | 1960 | 8,654 | Poor |
| US 2 over No Name Creek | 1933 | 6,701 | Poor |
| US 2 over S Fk Skykomish River | 1933 | 6,408 | Poor |
| US 2 over Bnrr | 1936 | 6,180 | Poor |
| Muliklteo Blvd over Merrill & Ring Creek | 1931 | 6,123 | Poor |
| Lowell-larimer Rd over Cattle Pass | 1972 | 5,643 | Poor |
| Mukilteo Blvd over Edgewater Creek | 1946 | 4,883 | Poor |
| Jordan Rd over Jordan Creek | 1981 | 1,618 | Poor |
| 44TH St NE over Little Pilchuck Creek | 1961 | 953 | Poor |
| Old 99 over Pilchuck Creek | 1933 | 428 | Poor |
| Tualco Loop Rd over Riley Slough | 1970 | 200 | Poor |
| Rd. No. 49 over Lost Creek | 1959 | 37 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-5 over 212TH St SW | 1963 | 98,485 | Fair |
| I-5 over 212TH St SW | 1963 | 98,485 | Fair |
| I-5 over 52ND Ave W | 1963 | 98,485 | Good |
| I-5 over 52ND Ave W | 1963 | 98,485 | Fair |
| I-5 over Lowell Road | 1950 | 94,939 | Good |
| I-5 over Lowell Road | 1967 | 94,939 | Good |
| I-5 SB over NB & SB Hov Ramps | 2007 | 94,939 | Good |
| I-5 NB over Railroad | 1967 | 90,360 | Fair |
| I-5 SB over Railroad | 1967 | 90,360 | Fair |
| I-5 over Smith Ave | 1967 | 90,360 | 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.