SR 509 over Des Moines Ck/Mem Trail
GoodKing County, Washington · 0.8 N JCT SR 516 · Structure no. 002003880000000
- Built
- 2007
- 18 years old
- Condition
- Good
- inspected February 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 82 ft
- 1 main span
- Daily traffic
- 19,398
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
SR 509 over Des Moines Ck/Mem Trail is a prestressed concrete stringer/multi-beam or girder carrying SR 509 over Des Moines Ck/Mem Trail in King County, Washington. It was built in 2007, so it is 18 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 19,398 vehicles a day, roughly 4% of them trucks, projected to reach 32,282 by 2039. The structure is 82 ft (25.1 m) long and 66 ft wide. If it were closed, the detour would be 8.1 mi (13 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 | 8 Very Good | No problems noted. |
| 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 509 over Des Moines Ck/Mem Trail built?
It was built in 2007, making it 18 years old in 2025.
What condition is SR 509 over Des Moines Ck/Mem Trail 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 February 2024.
How much traffic does SR 509 over Des Moines Ck/Mem Trail carry?
About 19,398 vehicles per day (2023 count), of which roughly 4% are trucks.
How long is SR 509 over Des Moines Ck/Mem Trail?
The structure is 82 ft (25.1 m) long with a longest span of 76 ft (23.1 m) and a deck 66 ft wide.
Who owns SR 509 over Des Moines Ck/Mem Trail?
It is owned by the State Highway Agency.