SR 509 over SR 509/DES Moines Mem
GoodKing County, Washington · 4.7 N JCT SR 516 · Structure no. 0011405A0000000
- Built
- 1979
- 46 years old
- Condition
- Good
- inspected September 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 85 ft
- 1 main span
- Daily traffic
- 7,555
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
SR 509 over SR 509/DES Moines Mem is a prestressed concrete stringer/multi-beam or girder carrying SR 509 over SR 509/DES Moines Mem in King County, Washington. It was built in 1979, so it is 46 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 7,555 vehicles a day, roughly 6% of them trucks, projected to reach 11,681 by 2039. The structure is 85 ft (25.9 m) long and 61 ft wide. If it were closed, the detour would be 1.9 mi (3 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 509 over SR 509/DES Moines Mem built?
It was built in 1979, making it 46 years old in 2025.
What condition is SR 509 over SR 509/DES Moines Mem 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 September 2023.
How much traffic does SR 509 over SR 509/DES Moines Mem carry?
About 7,555 vehicles per day (2023 count), of which roughly 6% are trucks.
How long is SR 509 over SR 509/DES Moines Mem?
The structure is 85 ft (25.9 m) long with a longest span of 81 ft (24.6 m) and a deck 61 ft wide.
Who owns SR 509 over SR 509/DES Moines Mem?
It is owned by the State Highway Agency.