SR 518 over 42nd Ave S
GoodKing County, Washington · 0.4 E JCT SR 99 · Structure no. 0007046B0000000
- Built
- 1963
- 62 years old
- Condition
- Good
- inspected August 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 207 ft
- 3 main spans
- Daily traffic
- 59,545
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
SR 518 over 42nd Ave S is a prestressed concrete stringer/multi-beam or girder carrying SR 518 over 42nd Ave S in King County, Washington. It was built in 1963, so it is 62 years old, older 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 59,545 vehicles a day, roughly 2% of them trucks, projected to reach 93,890 by 2039. The structure is 207 ft (63.1 m) long and 48 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 | 8 Very Good | No problems noted. |
| 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 SR 518 over 42nd Ave S built?
It was built in 1963, making it 62 years old in 2025.
What condition is SR 518 over 42nd Ave S 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 2023.
How much traffic does SR 518 over 42nd Ave S carry?
About 59,545 vehicles per day (2023 count), of which roughly 2% are trucks.
How long is SR 518 over 42nd Ave S?
The structure is 207 ft (63.1 m) long with a longest span of 70 ft (21.3 m) and a deck 48 ft wide.
Who owns SR 518 over 42nd Ave S?
It is owned by the State Highway Agency.