I-90 over Lake Washington
PoorKing County, Washington · 1.9 E JCT I-5 · Structure no. 000000KN0000000
- Built
- 1940
- 85 years old, rebuilt 1992
- Condition
- Poor
- inspected May 2023
- Type
- Other
- Concrete
- Length
- 6,561 ft
- 1 main span
- Daily traffic
- 68,544
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I-90 over Lake Washington is a concrete other carrying I-90 over Lake Washington in King County, Washington. It was built in 1940 and reconstructed in 1992, so it is 85 years old, older than the Washington average of 49.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
It carries about 68,544 vehicles a day, roughly 3% of them trucks, projected to reach 104,170 by 2039. The structure is 6,561 ft (1,999.8 m) long and 60 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 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I-90 over Lake Washington built?
It was built in 1940, making it 85 years old in 2025. It was reconstructed in 1992.
What condition is I-90 over Lake Washington in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in May 2023.
How much traffic does I-90 over Lake Washington carry?
About 68,544 vehicles per day (2023 count), of which roughly 3% are trucks.
How long is I-90 over Lake Washington?
The structure is 6,561 ft (1,999.8 m) long with a longest span of 6,561 ft (1,999.8 m) and a deck 60 ft wide.
Who owns I-90 over Lake Washington?
It is owned by the State Highway Agency.