I-405 over Cedar River
GoodKing County, Washington · 0.9 N JCT SR 515 · Structure no. 0014052B0000000
- Built
- 1994
- 31 years old
- Condition
- Good
- inspected November 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 558 ft
- 4 main spans
- Daily traffic
- 85,117
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I-405 over Cedar River is a steel continuous stringer/multi-beam or girder carrying I-405 over Cedar River in King County, Washington. It was built in 1994, so it is 31 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 85,117 vehicles a day, roughly 6% of them trucks, projected to reach 123,871 by 2039. The structure is 558 ft (170.1 m) long and 61 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. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I-405 over Cedar River built?
It was built in 1994, making it 31 years old in 2025.
What condition is I-405 over Cedar River 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 November 2023.
How much traffic does I-405 over Cedar River carry?
About 85,117 vehicles per day (2023 count), of which roughly 6% are trucks.
How long is I-405 over Cedar River?
The structure is 558 ft (170.1 m) long with a longest span of 195 ft (59.4 m) and a deck 61 ft wide.
Who owns I-405 over Cedar River?
It is owned by the State Highway Agency.