N-W Ramp over SR 520
GoodKing County, Washington · 3.7 N JCT I-90 · Structure no. 0007596F0000000
- Built
- 1966
- 59 years old
- Condition
- Good
- inspected April 2024
- Type
- Slab
- Concrete Continuous
- Length
- 260 ft
- 4 main spans
- Daily traffic
- 8,364
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
N-W Ramp over SR 520 is a concrete continuous slab carrying N-W Ramp over SR 520 in King County, Washington. It was built in 1966, so it is 59 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 8,364 vehicles a day, roughly 5% of them trucks, projected to reach 12,664 by 2039. The structure is 260 ft (79.2 m) long and 27 ft wide. If it were closed, the detour would be 6.2 mi (10 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 N-W Ramp over SR 520 built?
It was built in 1966, making it 59 years old in 2025.
What condition is N-W Ramp over SR 520 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 April 2024.
How much traffic does N-W Ramp over SR 520 carry?
About 8,364 vehicles per day (2023 count), of which roughly 5% are trucks.
How long is N-W Ramp over SR 520?
The structure is 260 ft (79.2 m) long with a longest span of 74 ft (22.6 m) and a deck 27 ft wide.
Who owns N-W Ramp over SR 520?
It is owned by the State Highway Agency.