SR 411 over Cowlitz River
PoorCowlitz County, Washington · 12.4 N JCT SR 432 · Structure no. 081062000000000
- Built
- 1963
- 62 years old
- Condition
- Poor
- inspected April 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 484 ft
- 5 main spans
- Daily traffic
- 6,753
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
SR 411 over Cowlitz River is a steel continuous stringer/multi-beam or girder carrying SR 411 over Cowlitz River in Cowlitz County, Washington. It was built in 1963, so it is 62 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 3 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 6,753 vehicles a day, roughly 7% of them trucks, projected to reach 8,790 by 2039. The structure is 484 ft (147.5 m) long and 34 ft wide. If it were closed, the detour would be 19.9 mi (32 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 | 3 Serious | Loss of section, deterioration, spalling or scour have seriously affected primary structural components. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 SR 411 over Cowlitz River built?
It was built in 1963, making it 62 years old in 2025.
What condition is SR 411 over Cowlitz River 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 April 2023.
How much traffic does SR 411 over Cowlitz River carry?
About 6,753 vehicles per day (2023 count), of which roughly 7% are trucks.
How long is SR 411 over Cowlitz River?
The structure is 484 ft (147.5 m) long with a longest span of 130 ft (39.6 m) and a deck 34 ft wide.
Who owns SR 411 over Cowlitz River?
It is owned by the State Highway Agency.