I-5 over Kalama River
GoodCowlitz County, Washington · 10.8 N JCT SR 503 · Structure no. 0008759C0000000
- Built
- 1971
- 54 years old
- Condition
- Good
- inspected April 2024
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete Continuous
- Length
- 480 ft
- 4 main spans
- Daily traffic
- 37,279
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I-5 over Kalama River is a prestressed concrete continuous box beam or girders - multiple carrying I-5 over Kalama River in Cowlitz County, Washington. It was built in 1971, so it is 54 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 37,279 vehicles a day, roughly 18% of them trucks, projected to reach 49,367 by 2039. The structure is 480 ft (146.3 m) long and 55 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 | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I-5 over Kalama River built?
It was built in 1971, making it 54 years old in 2025.
What condition is I-5 over Kalama River 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 April 2024.
How much traffic does I-5 over Kalama River carry?
About 37,279 vehicles per day (2023 count), of which roughly 18% are trucks.
How long is I-5 over Kalama River?
The structure is 480 ft (146.3 m) long with a longest span of 200 ft (61 m) and a deck 55 ft wide.
Who owns I-5 over Kalama River?
It is owned by the State Highway Agency.