Rd. No. 20 over S Fork Sauk River
Snohomish County, Washington · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Rd. No. 20 over S Fork Sauk River in Snohomish County, Washington, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1978, making it 47 years old at the 2025 inventory.
- It carries about 140 vehicles a day (traffic count year 1992).
- It is one of 232 of the 500 inventoried bridges in Snohomish County rated fair (46.4%); 20 (4.0%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated October 2024, on a 48-month routine inspection cycle.
- A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.
View this bridge on a map → (48.0328, -121.43659)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Prestressed concrete stringer or multi-beam girder |
| Length | about 100 ft |
| Location | Mp 31.2 Rd. No. 20 |
| NBI structure number | 060502000001465 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | October 2024 |
| Inspection interval (item 91) | 48 months |
| Scour (item 113) | 8: foundations stable, scour above the top of the footing |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Washington department of transportation.
Busiest bridges in Snohomish 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 |
All bridges nearby: Snohomish County, WA bridge conditions · every bridge in Snohomish County · Washington bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.