I-405 over NE 85th ST
GoodKing County, Washington · 3.3 N JCT SR 520 · Structure no. 0008674E0000000
- Built
- 1971
- 54 years old, rebuilt 1994
- Condition
- Good
- inspected April 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete Continuous
- Length
- 223 ft
- 3 main spans
- Daily traffic
- 80,423
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I-405 over NE 85th ST is a prestressed concrete continuous stringer/multi-beam or girder carrying I-405 over NE 85th ST in King County, Washington. It was built in 1971 and reconstructed in 1994, so it is 54 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 80,423 vehicles a day, roughly 6% of them trucks, projected to reach 126,385 by 2039. The structure is 223 ft (68 m) long and 67 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 I-405 over NE 85th ST built?
It was built in 1971, making it 54 years old in 2025. It was reconstructed in 1994.
What condition is I-405 over NE 85th ST 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 April 2024.
How much traffic does I-405 over NE 85th ST carry?
About 80,423 vehicles per day (2023 count), of which roughly 6% are trucks.
How long is I-405 over NE 85th ST?
The structure is 223 ft (68 m) long with a longest span of 106 ft (32.3 m) and a deck 67 ft wide.
Who owns I-405 over NE 85th ST?
It is owned by the State Highway Agency.