Structure 18066A0000000 · King County, WA
Carries SR 520 over Lake Washington, 1.5 E Jct SR 513.
7,635 ft end to end: about 21 football fields, or 1.4 miles. Lengths are drawn to scale; at this length a semi-truck would be a speck. Each part is colored by its latest inspection rating. The inventory records lengths but not heights or the layout of the shorter spans, so those are drawn as typical for a bridge of this kind.
| State | Washington |
| County | King |
| Location | 1.5 E Jct SR 513 |
| Carries | SR 520 |
| Crosses | Lake Washington |
| Coordinates | 47.64312, -122.27398 |
| Material | Concrete |
| Design | Other |
| Total Length | 7634.8 ft (2327.1 m) |
| Max Span | 7634.8 ft (2327.1 m) |
| Deck Width | 113.8 ft (34.7 m) |
| Deck Area | 80750.4 sq m |
| Main Spans | 1 |
| Year Built | 2016 |
| Avg Daily Traffic | 28,957 (2023) |
| Truck Traffic | 3% |
| Lanes On Bridge | 6 |
| Last Inspection | August 2023 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Historical significance is not determined |
| Scour Critical | 8 — Stable, low risk |
| Structure Number | 0018066A0000000 |
Inspectors rate each major part of a bridge (the deck you drive on, the superstructure of beams that holds it up, and the substructure of piers and abutments beneath) on a 0–9 scale. A bridge's overall condition is its lowest of those ratings, so one deteriorated component makes the whole bridge "poor."
A poor rating is not a closure. It means the bridge is flagged for priority repair or replacement; bridges judged unsafe are closed or posted with weight limits. The waterway (channel) rating is reported, but it does not count toward the overall classification.