SR 520 over Northup Way
GoodKing County, Washington · 0.3 E JCT I-405 · Structure no. 0009086A0000000
- Built
- 1971
- 54 years old, rebuilt 1998
- Condition
- Good
- inspected June 2024
- Type
- Box Beam or Girders - Multiple
- Concrete Continuous
- Length
- 376 ft
- 3 main spans
- Daily traffic
- 45,466
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
SR 520 over Northup Way is a concrete continuous box beam or girders - multiple carrying SR 520 over Northup Way in King County, Washington. It was built in 1971 and reconstructed in 1998, so it is 54 years old, older 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 45,466 vehicles a day, roughly 3% of them trucks, projected to reach 74,202 by 2039. The structure is 376 ft (114.6 m) long and 69 ft wide. If it were closed, the detour would be 1.2 mi (2 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. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was SR 520 over Northup Way built?
It was built in 1971, making it 54 years old in 2025. It was reconstructed in 1998.
What condition is SR 520 over Northup Way 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 June 2024.
How much traffic does SR 520 over Northup Way carry?
About 45,466 vehicles per day (2023 count), of which roughly 3% are trucks.
How long is SR 520 over Northup Way?
The structure is 376 ft (114.6 m) long with a longest span of 143 ft (43.6 m) and a deck 69 ft wide.
Who owns SR 520 over Northup Way?
It is owned by the State Highway Agency.