SR 20 over Alder Creek
Good Condition78 years old5,888 vehicles/day
Location
| State | Washington |
| County | Skagit |
| Location | 13.3 E Jct SR 9 |
| Carries | SR 20 |
| Crosses | Alder Creek |
| Coordinates | 48.52403, -121.95019 |
Condition Ratings
| Overall Condition | Good |
| Deck | 7 (Good) |
| Superstructure | 7 (Good) |
| Substructure | 7 (Good) |
| Channel/Waterway | 6 (Satisfactory) |
| Scour Critical | 5 — Stable for scour |
Physical Characteristics
| Material | Concrete Continuous |
| Design | Slab |
| Total Length | 82.0 ft (25 m) |
| Max Span | 19.0 ft (5.8 m) |
| Deck Width | 40.0 ft (12.2 m) |
| Deck Area | 305 sq m |
| Main Spans | 4 |
| Year Built | 1948 |
Traffic
| Avg Daily Traffic | 5,888 (2023) |
| Truck Traffic | 8% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 323 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 0003361A0000000 |