304th ST over SR 18
GoodKing County, Washington · 4.6 E JCT SR 164 · Structure no. 0014776F0000000
- Built
- 1997
- 28 years old
- Condition
- Good
- inspected October 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete Continuous
- Length
- 259 ft
- 2 main spans
- Daily traffic
- 11,963
- 2016 count
- Owner
- State
- State Highway Agency
About this bridge
304th ST over SR 18 is a prestressed concrete continuous stringer/multi-beam or girder carrying 304th ST over SR 18 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 11,963 vehicles a day, roughly 1% of them trucks, projected to reach 18,735 by 2038. The structure is 259 ft (78.9 m) long and 56 ft wide.
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 304th ST over SR 18 built?
It was built in 1997, making it 28 years old in 2025.
What condition is 304th ST over SR 18 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 304th ST over SR 18 carry?
About 11,963 vehicles per day (2016 count), of which roughly 1% are trucks.
How long is 304th ST over SR 18?
The structure is 259 ft (78.9 m) long with a longest span of 131 ft (39.8 m) and a deck 56 ft wide.
Who owns 304th ST over SR 18?
It is owned by the State Highway Agency.