S 156th ST over SR 509
GoodKing County, Washington · 6.5 N JCT SR 516 · Structure no. 0008745B0000000
- Built
- 1970
- 55 years old
- Condition
- Good
- inspected March 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete Continuous
- Length
- 243 ft
- 4 main spans
- Daily traffic
- 8,754
- 2010 count
- Owner
- State
- State Highway Agency
About this bridge
S 156th ST over SR 509 is a prestressed concrete continuous stringer/multi-beam or girder carrying S 156th 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 8,754 vehicles a day, roughly 4% of them trucks, projected to reach 14,129 by 2032. The structure is 243 ft (74.1 m) long and 56 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 | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was S 156th ST over SR 509 built?
It was built in 1970, making it 55 years old in 2025.
What condition is S 156th 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 S 156th ST over SR 509 carry?
About 8,754 vehicles per day (2010 count), of which roughly 4% are trucks.
How long is S 156th ST over SR 509?
The structure is 243 ft (74.1 m) long with a longest span of 65 ft (19.8 m) and a deck 56 ft wide.
Who owns S 156th ST over SR 509?
It is owned by the State Highway Agency.