SR 520 over Lake Washington
GoodKing County, Washington · 0.7 E JCT SR 513 · Structure no. 0018625A0000000
- Built
- 2017
- 8 years old
- Condition
- Good
- inspected August 2023
- Type
- Stringer/Multi-beam or Girder
- Concrete Continuous
- Length
- 5,968 ft
- 41 main spans
- Daily traffic
- 19,472
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
SR 520 over Lake Washington is a concrete continuous stringer/multi-beam or girder carrying SR 520 over Lake Washington in King County, Washington. It was built in 2017, so it is 8 years old, younger than the Washington average of 49.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 19,472 vehicles a day, roughly 3% of them trucks, projected to reach 35,198 by 2039. The structure is 5,968 ft (1,819 m) long and 78 ft wide. If it were closed, the detour would be 18 mi (29 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 8 Very Good | No problems noted. |
| Substructure | 8 Very Good | No problems noted. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was SR 520 over Lake Washington built?
It was built in 2017, making it 8 years old in 2025.
What condition is SR 520 over Lake Washington in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2023.
How much traffic does SR 520 over Lake Washington carry?
About 19,472 vehicles per day (2023 count), of which roughly 3% are trucks.
How long is SR 520 over Lake Washington?
The structure is 5,968 ft (1,819 m) long with a longest span of 160 ft (48.8 m) and a deck 78 ft wide.
Who owns SR 520 over Lake Washington?
It is owned by the State Highway Agency.