SR 520 over Portage Bay
Fair Condition63 years old18,129 vehicles/day
Location
| State | Washington |
| County | King |
| Location | 0.3 E Jct I-5 |
| Carries | SR 520 |
| Crosses | Portage Bay |
| Coordinates | 47.64275, -122.31767 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 6 (Satisfactory) |
| Superstructure | 7 (Good) |
| Substructure | 5 (Fair) |
| Channel/Waterway | 8 (Very Good) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Prestressed Concrete |
| Design | Stringer/Multi-beam |
| Total Length | 2840.9 ft (865.9 m) |
| Max Span | 100.1 ft (30.5 m) |
| Deck Width | 70.9 ft (21.6 m) |
| Deck Area | 18703.4 sq m |
| Main Spans | 29 |
| Year Built | 1963 |
Traffic
| Avg Daily Traffic | 18,129 (2023) |
| Truck Traffic | 3% |
| Lanes On Bridge | 4 |
| Lanes Under Bridge | 2 |
Inspection & Ownership
| Last Inspection | 324 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 0006819A0000000 |