SR 203 over Slough
GoodKing County, Washington · 1.8 N JCT SR 202 · Structure no. 0012947A0000000
- Built
- 1986
- 39 years old
- Condition
- Good
- inspected August 2024
- Type
- Slab
- Prestressed Concrete
- Length
- 210 ft
- 5 main spans
- Daily traffic
- 7,813
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
SR 203 over Slough is a prestressed concrete slab carrying SR 203 over Slough in King County, Washington. It was built in 1986, so it is 39 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 7,813 vehicles a day, roughly 10% of them trucks, projected to reach 10,989 by 2039. The structure is 210 ft (64 m) long and 36 ft wide. If it were closed, the detour would be 5 mi (8 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 | 8 Very Good | No problems noted. |
| 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 203 over Slough built?
It was built in 1986, making it 39 years old in 2025.
What condition is SR 203 over Slough 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 August 2024.
How much traffic does SR 203 over Slough carry?
About 7,813 vehicles per day (2023 count), of which roughly 10% are trucks.
How long is SR 203 over Slough?
The structure is 210 ft (64 m) long with a longest span of 42 ft (12.8 m) and a deck 36 ft wide.
Who owns SR 203 over Slough?
It is owned by the State Highway Agency.