S-E Ramp I-405 over SR 520
GoodKing County, Washington · JCT SR 520 · Structure no. 0014039A0000000
- Built
- 1993
- 32 years old
- Condition
- Good
- inspected August 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete Continuous
- Length
- 720 ft
- 8 main spans
- Daily traffic
- 14,260
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
S-E Ramp I-405 over SR 520 is a prestressed concrete continuous stringer/multi-beam or girder carrying S-E Ramp I-405 over SR 520 in King County, Washington. It was built in 1993, so it is 32 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 14,260 vehicles a day, roughly 5% of them trucks, projected to reach 22,409 by 2039. The structure is 720 ft (219.5 m) long and 31 ft wide.
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 S-E Ramp I-405 over SR 520 built?
It was built in 1993, making it 32 years old in 2025.
What condition is S-E Ramp I-405 over SR 520 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 August 2024.
How much traffic does S-E Ramp I-405 over SR 520 carry?
About 14,260 vehicles per day (2023 count), of which roughly 5% are trucks.
How long is S-E Ramp I-405 over SR 520?
The structure is 720 ft (219.5 m) long with a longest span of 103 ft (31.4 m) and a deck 31 ft wide.
Who owns S-E Ramp I-405 over SR 520?
It is owned by the State Highway Agency.