51st Ave S over SR 518
FairKing County, Washington · 1.0 E JCT SR 99 · Structure no. 0007401K0000000
- Built
- 1966
- 59 years old
- Condition
- Fair
- inspected April 2024
- Type
- Box Beam or Girders - Multiple
- Concrete Continuous
- Length
- 295 ft
- 4 main spans
- Daily traffic
- 8,894
- 2016 count
- Owner
- State
- State Highway Agency
About this bridge
51st Ave S over SR 518 is a concrete continuous box beam or girders - multiple carrying 51st Ave S over SR 518 in King County, Washington. It was built in 1966, so it is 59 years old, older 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 6 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 8,894 vehicles a day, roughly 3% of them trucks, projected to reach 13,928 by 2038. The structure is 295 ft (89.9 m) long and 36 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was 51st Ave S over SR 518 built?
It was built in 1966, making it 59 years old in 2025.
What condition is 51st Ave S over SR 518 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 2024.
How much traffic does 51st Ave S over SR 518 carry?
About 8,894 vehicles per day (2016 count), of which roughly 3% are trucks.
How long is 51st Ave S over SR 518?
The structure is 295 ft (89.9 m) long with a longest span of 91 ft (27.7 m) and a deck 36 ft wide.
Who owns 51st Ave S over SR 518?
It is owned by the State Highway Agency.