SR 509 over N-n Ramp
Fair Condition58 years old10,009 vehicles/day
Location
| State | Washington |
| County | King |
| Location | 4.0 N Jct SR 518 |
| Carries | SR 509 |
| Crosses | N-n Ramp |
| Coordinates | 47.52475, -122.33411 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 7 (Good) |
| Superstructure | 6 (Satisfactory) |
| Substructure | 7 (Good) |
| Scour Critical | Not applicable |
Physical Characteristics
| Material | Concrete Continuous |
| Design | Box Beam - Multiple |
| Total Length | 462.9 ft (141.1 m) |
| Max Span | 149.9 ft (45.7 m) |
| Deck Width | 26.9 ft (8.2 m) |
| Deck Area | 1157.0 sq m |
| Main Spans | 4 |
| Year Built | 1968 |
Traffic
| Avg Daily Traffic | 10,009 (2022) |
| Truck Traffic | 5% |
| Lanes On Bridge | 1 |
| Lanes Under Bridge | 6 |
Inspection & Ownership
| Last Inspection | 823 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 0008276F0000000 |