S 320th ST over I-5
Fair Condition66 years old49,879 vehicles/day
Location
| State | Washington |
| County | King |
| Location | 1.8 N Jct SR 18 |
| Carries | S 320th ST |
| Crosses | I-5 |
| Coordinates | 47.31514, -122.29819 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 6 (Satisfactory) |
| Superstructure | 5 (Fair) |
| Substructure | 7 (Good) |
| Scour Critical | Not applicable |
Physical Characteristics
| Material | Prestressed Concrete |
| Design | Stringer/Multi-beam |
| Total Length | 332.0 ft (101.2 m) |
| Max Span | 100.1 ft (30.5 m) |
| Deck Width | 76.1 ft (23.2 m) |
| Deck Area | 2347.8 sq m |
| Main Spans | 4 |
| Year Built | 1960 |
Traffic
| Avg Daily Traffic | 49,879 (2021) |
| Truck Traffic | 6% |
| Lanes On Bridge | 5 |
| Lanes Under Bridge | 14 |
Inspection & Ownership
| Last Inspection | October 2024 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 0006262A0000000 |