SR 99 over SR 509
GoodKing County, Washington · 1.6 N JCT SR 516 · Structure no. 002005430000000
- Built
- 2022
- 3 years old
- Condition
- Good
- inspected August 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 257 ft
- 2 main spans
- Daily traffic
- 12,230
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
SR 99 over SR 509 is a prestressed concrete stringer/multi-beam or girder carrying SR 99 over SR 509 in King County, Washington. It was built in 2022, so it is 3 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 12,230 vehicles a day, roughly 3% of them trucks, projected to reach 28,384 by 2039. The structure is 257 ft (78.3 m) long and 92 ft wide.
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. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was SR 99 over SR 509 built?
It was built in 2022, making it 3 years old in 2025.
What condition is SR 99 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 August 2023.
How much traffic does SR 99 over SR 509 carry?
About 12,230 vehicles per day (2023 count), of which roughly 3% are trucks.
How long is SR 99 over SR 509?
The structure is 257 ft (78.3 m) long with a longest span of 149 ft (45.4 m) and a deck 92 ft wide.
Who owns SR 99 over SR 509?
It is owned by the State Highway Agency.