NE 124th ST over I-405
FairKing County, Washington · 5.5 N JCT SR 520 · Structure no. 0008615D0000000
- Built
- 1969
- 56 years old
- Condition
- Fair
- inspected April 2024
- Type
- Box Beam or Girders - Multiple
- Concrete Continuous
- Length
- 442 ft
- 4 main spans
- Daily traffic
- 39,499
- 2015 count
- Owner
- State
- State Highway Agency
About this bridge
NE 124th ST over I-405 is a concrete continuous box beam or girders - multiple carrying NE 124th ST over I-405 in King County, Washington. It was built in 1969, so it is 56 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 39,499 vehicles a day, roughly 5% of them trucks, projected to reach 59,867 by 2036. The structure is 442 ft (134.7 m) long and 66 ft wide. If it were closed, the detour would be 1.9 mi (3 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 | 7 Good | Some minor problems. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was NE 124th ST over I-405 built?
It was built in 1969, making it 56 years old in 2025.
What condition is NE 124th ST over I-405 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 NE 124th ST over I-405 carry?
About 39,499 vehicles per day (2015 count), of which roughly 5% are trucks.
How long is NE 124th ST over I-405?
The structure is 442 ft (134.7 m) long with a longest span of 143 ft (43.6 m) and a deck 66 ft wide.
Who owns NE 124th ST over I-405?
It is owned by the State Highway Agency.