SR 18 Westbound over Soosette Creek
GoodKing County, Washington · 4.7 E JCT SR 164 · Structure no. 0014776B0000000
- Built
- 1997
- 28 years old
- Condition
- Good
- inspected October 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete Continuous
- Length
- 360 ft
- 3 main spans
- Daily traffic
- 28,147
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
SR 18 Westbound over Soosette Creek is a prestressed concrete continuous stringer/multi-beam or girder carrying SR 18 Westbound over Soosette Creek in King County, Washington. It was built in 1997, so it is 28 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 28,147 vehicles a day, roughly 11% of them trucks, projected to reach 40,870 by 2039. The structure is 360 ft (109.7 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. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was SR 18 Westbound over Soosette Creek built?
It was built in 1997, making it 28 years old in 2025.
What condition is SR 18 Westbound over Soosette Creek 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 October 2023.
How much traffic does SR 18 Westbound over Soosette Creek carry?
About 28,147 vehicles per day (2023 count), of which roughly 11% are trucks.
How long is SR 18 Westbound over Soosette Creek?
The structure is 360 ft (109.7 m) long with a longest span of 120 ft (36.6 m) and a deck 41 ft wide.
Who owns SR 18 Westbound over Soosette Creek?
It is owned by the State Highway Agency.