I-5 over Terrain
FairKing County, Washington · 2.1 N JCT I-90 · Structure no. 0006653A0000000
- Built
- 1962
- 63 years old
- Condition
- Fair
- inspected April 2023
- Type
- Box Beam or Girders - Multiple
- Concrete Continuous
- Length
- 213 ft
- 3 main spans
- Daily traffic
- 10,636
- 2012 count
- Owner
- State
- State Highway Agency
About this bridge
I-5 over Terrain is a concrete continuous box beam or girders - multiple carrying I-5 over Terrain in King County, Washington. It was built in 1962, so it is 63 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 10,636 vehicles a day, roughly 5% of them trucks, projected to reach 17,783 by 2036. The structure is 213 ft (64.9 m) long and 26 ft wide. If it were closed, the detour would be 3.1 mi (5 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 I-5 over Terrain built?
It was built in 1962, making it 63 years old in 2025.
What condition is I-5 over Terrain 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 April 2023.
How much traffic does I-5 over Terrain carry?
About 10,636 vehicles per day (2012 count), of which roughly 5% are trucks.
How long is I-5 over Terrain?
The structure is 213 ft (64.9 m) long with a longest span of 83 ft (25.3 m) and a deck 26 ft wide.
Who owns I-5 over Terrain?
It is owned by the State Highway Agency.