I-5 over Terrain
GoodKing County, Washington · 3.9 N JCT SR 900 · Structure no. 0008568A0000000
- Built
- 1969
- 56 years old
- Condition
- Good
- inspected May 2023
- Type
- Box Beam or Girders - Multiple
- Concrete
- Length
- 391 ft
- 8 main spans
- Daily traffic
- 4,737
- 2012 count
- Owner
- State
- State Highway Agency
About this bridge
I-5 over Terrain is a concrete box beam or girders - multiple carrying I-5 over Terrain in King County, Washington. It was built in 1969, so it is 56 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.
It carries about 4,737 vehicles a day, roughly 5% of them trucks, projected to reach 7,920 by 2036. The structure is 391 ft (119.2 m) long and 33 ft wide. If it were closed, the detour would be 5 mi (8 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. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I-5 over Terrain built?
It was built in 1969, making it 56 years old in 2025.
What condition is I-5 over Terrain 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 May 2023.
How much traffic does I-5 over Terrain carry?
About 4,737 vehicles per day (2012 count), of which roughly 5% are trucks.
How long is I-5 over Terrain?
The structure is 391 ft (119.2 m) long with a longest span of 49 ft (14.9 m) and a deck 33 ft wide.
Who owns I-5 over Terrain?
It is owned by the State Highway Agency.