SE 312th Way over SR 18
GoodKing County, Washington · 3.8 E JCT SR 164 · Structure no. 0014776G0000000
- Built
- 1997
- 28 years old
- Condition
- Good
- inspected March 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete Continuous
- Length
- 227 ft
- 2 main spans
- Daily traffic
- 24
- 2014 count
- Owner
- State
- State Highway Agency
About this bridge
SE 312th Way over SR 18 is a prestressed concrete continuous stringer/multi-beam or girder carrying SE 312th Way 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 24 vehicles a day, roughly 1% of them trucks, projected to reach 24 by 2034. The structure is 227 ft (69.2 m) long and 30 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. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was SE 312th Way over SR 18 built?
It was built in 1997, making it 28 years old in 2025.
What condition is SE 312th Way 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 March 2024.
How much traffic does SE 312th Way over SR 18 carry?
About 24 vehicles per day (2014 count), of which roughly 1% are trucks.
How long is SE 312th Way over SR 18?
The structure is 227 ft (69.2 m) long with a longest span of 120 ft (36.6 m) and a deck 30 ft wide.
Who owns SE 312th Way over SR 18?
It is owned by the State Highway Agency.