Cowlitz Falls
Key Takeaway
Cowlitz Falls is classified as significant hazard in Washington. It was completed in 1994 and is 32 years old. Its primary use is hydroelectric. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 120 ft (taller than 66.3% in WA) |
| Dam Length | 700 ft |
| Dam Type | Concrete |
| Normal Storage | 11.0K acre-ft |
| Surface Area | 700 acres |
| Drainage Area | 1,000 sq mi |
| Max Discharge | 360,000 cfs |
| Year Completed | 1994 (32 years old) |
| NID ID | WA00581 |
Safety Information
No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
PUD #1 of Lewis County, WA
Public Utility
Frequently Asked Questions
What is the hazard classification of Cowlitz Falls?
Cowlitz Falls is classified as Significant Hazard. No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Cowlitz Falls?
Cowlitz Falls is owned by PUD #1 of Lewis County, WA (Public Utility). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Cowlitz Falls built?
Cowlitz Falls was completed in 1994, making it 32 years old. Many U.S. dams were built between the 1930s and 1970s during a period of major infrastructure investment.
What is the primary purpose of Cowlitz Falls?
Cowlitz Falls serves the following purposes: Hydroelectric, Fish And Wildlife Pond, Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Cowlitz Falls?
Cowlitz Falls has a dam height of 120 ft. Dam height is measured from the natural streambed at the downstream toe to the top of the dam, and may differ from the visible height.
When was Cowlitz Falls last inspected?
Cowlitz Falls was last inspected on September 7, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.