I-405 over Green River
FairKing County, Washington · 0.9 N JCT I-5 · Structure no. 0007249B0000000
- Built
- 1964
- 61 years old, rebuilt 1988
- Condition
- Fair
- inspected September 2024
- Type
- Box Beam or Girders - Multiple
- Concrete Continuous
- Length
- 245 ft
- 3 main spans
- Daily traffic
- 77,251
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I-405 over Green River is a concrete continuous box beam or girders - multiple carrying I-405 over Green River in King County, Washington. It was built in 1964 and reconstructed in 1988, so it is 61 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 77,251 vehicles a day, roughly 6% of them trucks, projected to reach 112,423 by 2039. The structure is 245 ft (74.7 m) long and 160 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 Green River built?
It was built in 1964, making it 61 years old in 2025. It was reconstructed in 1988.
What condition is I-405 over Green River 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 September 2024.
How much traffic does I-405 over Green River carry?
About 77,251 vehicles per day (2023 count), of which roughly 6% are trucks.
How long is I-405 over Green River?
The structure is 245 ft (74.7 m) long with a longest span of 110 ft (33.4 m) and a deck 160 ft wide.
Who owns I-405 over Green River?
It is owned by the State Highway Agency.