I-405 over SR 900 / N Park DR
FairKing County, Washington · JCT SR 900 · Structure no. 0007828A0000000
- Built
- 1966
- 59 years old, rebuilt 1986
- Condition
- Fair
- inspected June 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 215 ft
- 3 main spans
- Daily traffic
- 65,721
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I-405 over SR 900 / N Park DR is a prestressed concrete stringer/multi-beam or girder carrying I-405 over SR 900 / N Park DR in King County, Washington. It was built in 1966 and reconstructed in 1986, 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 65,721 vehicles a day, roughly 6% of them trucks, projected to reach 95,644 by 2039. The structure is 215 ft (65.5 m) long and 57 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 | 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 I-405 over SR 900 / N Park DR built?
It was built in 1966, making it 59 years old in 2025. It was reconstructed in 1986.
What condition is I-405 over SR 900 / N Park DR 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 June 2023.
How much traffic does I-405 over SR 900 / N Park DR carry?
About 65,721 vehicles per day (2023 count), of which roughly 6% are trucks.
How long is I-405 over SR 900 / N Park DR?
The structure is 215 ft (65.5 m) long with a longest span of 105 ft (32 m) and a deck 57 ft wide.
Who owns I-405 over SR 900 / N Park DR?
It is owned by the State Highway Agency.