Stemilt Main Dam
Key Takeaway
Stemilt Main Dam is classified as high hazard in Washington. It was completed in 1962 and is 64 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 | 1,000 ft |
| Dam Type | Earth |
| Max Storage | 670 acre-ft |
| Normal Storage | 580 acre-ft |
| Surface Area | 23 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 20 cfs |
| Year Completed | 1962 (64 years old) |
| NID ID | WA00014 |
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
Lower Stemilt Irrigation District
Public Utility
Nearby Dams
Stemilt Saddle Dam
Chelan, WA
High HazardShiflett Reservoir No. 2
Chelan, WA
High HazardShiflett Reservoir No. 1
Chelan, WA
High HazardLily Lake Dam
Chelan, WA
High HazardClear Lake Saddle Dam
Chelan, WA
High HazardClear Lake Dam
Chelan, WA
High Hazard3 Amigos Reservoir
Chelan, WA
High HazardSpring Hill Saddle Dam
Chelan, WA
High HazardFrequently Asked Questions
What is the hazard classification of Stemilt Main Dam?
Stemilt Main 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 Stemilt Main Dam?
Stemilt Main Dam is owned by Lower Stemilt Irrigation District (Public Utility). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Stemilt Main Dam built?
Stemilt Main Dam was completed in 1962, making it 64 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 Stemilt Main Dam?
Stemilt Main Dam serves the following purposes: Irrigation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
When was Stemilt Main Dam last inspected?
Stemilt Main Dam was last inspected on October 30, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.