66th Ave S over I-405
GoodKing County, Washington · 0.8 N JCT I-5 · Structure no. 0013354A0000000
- Built
- 1990
- 35 years old
- Condition
- Good
- inspected April 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete Continuous
- Length
- 205 ft
- 2 main spans
- Daily traffic
- 12,000
- 2010 count
- Owner
- State
- State Highway Agency
About this bridge
66th Ave S over I-405 is a prestressed concrete continuous stringer/multi-beam or girder carrying 66th Ave S over I-405 in King County, Washington. It was built in 1990, so it is 35 years old, younger 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 12,000 vehicles a day, roughly 3% of them trucks, projected to reach 19,368 by 2032. The structure is 205 ft (62.5 m) long and 71 ft wide. If it were closed, the detour would be 5 mi (8 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 66th Ave S over I-405 built?
It was built in 1990, making it 35 years old in 2025.
What condition is 66th Ave S over I-405 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 66th Ave S over I-405 carry?
About 12,000 vehicles per day (2010 count), of which roughly 3% are trucks.
How long is 66th Ave S over I-405?
The structure is 205 ft (62.5 m) long with a longest span of 104 ft (31.7 m) and a deck 71 ft wide.
Who owns 66th Ave S over I-405?
It is owned by the State Highway Agency.