Square Lake Dam
Key Takeaway
Square Lake Dam is classified as high hazard in Washington. It was completed in 1938 and is 88 years old. Its primary use is irrigation. High hazard means loss of life is likely if the dam fails — it does not indicate the dam's current condition. Learn more.
Physical Details
| Dam Length | 104 ft |
| Dam Type | Rockfill |
| Max Storage | 913 acre-ft |
| Normal Storage | 674 acre-ft |
| Surface Area | 500 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 0 cfs |
| Year Completed | 1938 (88 years old) |
| NID ID | WA00224 |
Safety Information
Loss of human life is likely if the dam fails.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
Icicle & Peshastin Irrigation District
Public Utility
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Square Lake Dam?
Square Lake Dam is classified as High Hazard. Loss of human life is likely if the dam fails. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Square Lake Dam?
Square Lake Dam is owned by Icicle & Peshastin Irrigation District (Public Utility). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Square Lake Dam built?
Square Lake Dam was completed in 1938, making it 88 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 Square Lake Dam?
Square Lake Dam serves the following purposes: Irrigation, Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
When was Square Lake Dam last inspected?
Square Lake Dam was last inspected on November 3, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.