So 146th ST over SR 509
GoodKing County, Washington · 0.1 N JCT SR 518 · Structure no. 0008745D0000000
- Built
- 1970
- 55 years old
- Condition
- Good
- inspected March 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete Continuous
- Length
- 296 ft
- 4 main spans
- Daily traffic
- 5,632
- 2012 count
- Owner
- State
- State Highway Agency
About this bridge
So 146th ST over SR 509 is a prestressed concrete continuous stringer/multi-beam or girder carrying So 146th ST over SR 509 in King County, Washington. It was built in 1970, so it is 55 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 5,632 vehicles a day, roughly 4% of them trucks. The structure is 296 ft (90.2 m) long and 41 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 So 146th ST over SR 509 built?
It was built in 1970, making it 55 years old in 2025.
What condition is So 146th ST over SR 509 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 March 2024.
How much traffic does So 146th ST over SR 509 carry?
About 5,632 vehicles per day (2012 count), of which roughly 4% are trucks.
How long is So 146th ST over SR 509?
The structure is 296 ft (90.2 m) long with a longest span of 95 ft (29 m) and a deck 41 ft wide.
Who owns So 146th ST over SR 509?
It is owned by the State Highway Agency.