SW Spokane ST over W Waterway of Duwamish
FairKing County, Washington · 1200 SW Spokane ST · Structure no. 085944000000000
- Built
- 1991
- 34 years old
- Condition
- Fair
- inspected April 2023
- Type
- Movable - Swing
- Prestressed Concrete
- Length
- 836 ft
- 3 main spans
- Daily traffic
- 11,500
- 2022 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
SW Spokane ST over W Waterway of Duwamish is a prestressed concrete movable - swing carrying SW Spokane ST over W Waterway of Duwamish in King County, Washington. It was built in 1991, so it is 34 years old, younger than the Washington average of 49.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 11,500 vehicles a day, roughly 30% of them trucks, projected to reach 15,000 by 2039. The structure is 836 ft (254.8 m) long and 51 ft wide. If it were closed, the detour would be 1.2 mi (2 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was SW Spokane ST over W Waterway of Duwamish built?
It was built in 1991, making it 34 years old in 2025.
What condition is SW Spokane ST over W Waterway of Duwamish in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in April 2023.
How much traffic does SW Spokane ST over W Waterway of Duwamish carry?
About 11,500 vehicles per day (2022 count), of which roughly 30% are trucks.
How long is SW Spokane ST over W Waterway of Duwamish?
The structure is 836 ft (254.8 m) long with a longest span of 440 ft (134.1 m) and a deck 51 ft wide.
Who owns SW Spokane ST over W Waterway of Duwamish?
It is owned by the City or Municipal Highway Agency.