I-405 over May Creek
GoodPosted for loadKing County, Washington · 1.8 N JCT SR 900 · Structure no. 0005347C0000000
- Built
- 1958
- 67 years old, rebuilt 1986
- Condition
- Good
- inspected June 2023
- Type
- Tee Beam
- Concrete Continuous
- Length
- 169 ft
- 3 main spans
- Daily traffic
- 74,980
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I-405 over May Creek is a concrete continuous tee beam carrying I-405 over May Creek in King County, Washington. It was built in 1958 and reconstructed in 1986, so it is 67 years old, older 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. Its operating status is: posted for load restriction.
It carries about 74,980 vehicles a day, roughly 6% of them trucks, projected to reach 108,032 by 2039. The structure is 169 ft (51.5 m) long and 79 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 May Creek built?
It was built in 1958, making it 67 years old in 2025. It was reconstructed in 1986.
What condition is I-405 over May Creek 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 June 2023.
How much traffic does I-405 over May Creek carry?
About 74,980 vehicles per day (2023 count), of which roughly 6% are trucks.
How long is I-405 over May Creek?
The structure is 169 ft (51.5 m) long with a longest span of 66 ft (20.1 m) and a deck 79 ft wide.
Who owns I-405 over May Creek?
It is owned by the State Highway Agency.