SR 520 over Pkwy & Sammamish River
GoodKing County, Washington · 4.9 E JCT I-405 · Structure no. 0014444A0000000
- Built
- 1995
- 30 years old
- Condition
- Good
- inspected August 2024
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete Continuous
- Length
- 391 ft
- 4 main spans
- Daily traffic
- 42,985
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
SR 520 over Pkwy & Sammamish River is a prestressed concrete continuous box beam or girders - multiple carrying SR 520 over Pkwy & Sammamish River in King County, Washington. It was built in 1995, so it is 30 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 42,985 vehicles a day, roughly 3% of them trucks, projected to reach 70,150 by 2039. The structure is 391 ft (119.3 m) long and 58 ft wide. If it were closed, the detour would be 1.9 mi (3 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 | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| 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 Pkwy & Sammamish River built?
It was built in 1995, making it 30 years old in 2025.
What condition is SR 520 over Pkwy & Sammamish River 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 2024.
How much traffic does SR 520 over Pkwy & Sammamish River carry?
About 42,985 vehicles per day (2023 count), of which roughly 3% are trucks.
How long is SR 520 over Pkwy & Sammamish River?
The structure is 391 ft (119.3 m) long with a longest span of 124 ft (37.7 m) and a deck 58 ft wide.
Who owns SR 520 over Pkwy & Sammamish River?
It is owned by the State Highway Agency.