Little Falls Spillway Dam
Key Takeaway
Little Falls Spillway Dam is classified as low hazard in Washington. It was completed in 1910 and is 116 years old. Its primary use is hydroelectric.
Physical Details
| Dam Type | Gravity |
| Max Storage | 4.3K acre-ft |
| Normal Storage | 4.3K acre-ft |
| Surface Area | 4,250 acres |
| Drainage Area | 5,844 sq mi |
| Max Discharge | 70,000 cfs |
| Year Completed | 1910 (116 years old) |
| NID ID | WA00653 |
Safety Information
No probable loss of human life and low economic/environmental losses expected.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
Avista Utilities
Private
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Little Falls Spillway Dam?
Little Falls Spillway Dam is classified as Low Hazard. No probable loss of human life and low economic/environmental losses expected. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Little Falls Spillway Dam?
Little Falls Spillway Dam is owned by Avista Utilities (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Little Falls Spillway Dam built?
Little Falls Spillway Dam was completed in 1910, making it 116 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 Little Falls Spillway Dam?
Little Falls Spillway Dam serves the following purposes: Hydroelectric, Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
When was Little Falls Spillway Dam last inspected?
Little Falls Spillway Dam was last inspected on September 28, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.