N-Seneca Ramp over I-5 SB & City Streets
FairKing County, Washington · 1.0 N JCT I-90 · Structure no. 0007110H0000000
- Built
- 1964
- 61 years old
- Condition
- Fair
- inspected July 2023
- Type
- Box Beam or Girders - Multiple
- Concrete Continuous
- Length
- 971 ft
- 12 main spans
- Daily traffic
- 9,991
- 2012 count
- Owner
- State
- State Highway Agency
About this bridge
N-Seneca Ramp over I-5 SB & City Streets is a concrete continuous box beam or girders - multiple carrying N-Seneca Ramp over I-5 SB & City Streets in King County, Washington. It was built in 1964, 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 9,991 vehicles a day, roughly 5% of them trucks, projected to reach 16,705 by 2036. The structure is 971 ft (296.1 m) long and 27 ft wide. If it were closed, the detour would be 1.9 mi (3 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 | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was N-Seneca Ramp over I-5 SB & City Streets built?
It was built in 1964, making it 61 years old in 2025.
What condition is N-Seneca Ramp over I-5 SB & City Streets 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 July 2023.
How much traffic does N-Seneca Ramp over I-5 SB & City Streets carry?
About 9,991 vehicles per day (2012 count), of which roughly 5% are trucks.
How long is N-Seneca Ramp over I-5 SB & City Streets?
The structure is 971 ft (296.1 m) long with a longest span of 84 ft (25.5 m) and a deck 27 ft wide.
Who owns N-Seneca Ramp over I-5 SB & City Streets?
It is owned by the State Highway Agency.