Stemilt Equalizing Reservoir
Stemilt Equalizing Reservoir is an earth dam located in Chelan County, Washington, built in 1985. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Stemilt Equalizing Reservoir
The primary purpose of Stemilt Equalizing Reservoir is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Stemilt Irrigation District (public utility). It impounds the Tr-stemilt Creek-offstream near Malaga.
The dam stands 19 feet tall and stretches 440 feet across, creates a reservoir covering 4 acres, has a maximum storage capacity of 43 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1985, the structure is 41 years old.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 05/22/2024.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Washington dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Washington |
| County | Chelan |
| Nearest City | Malaga |
| River/Stream | Tr-stemilt Creek-offstream |
| Coordinates | 47.32533, -120.26309 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 19 ft |
| Dam Length | 440 ft |
| Year Completed | 1985 (41 years old) |
Storage & Hydraulics
| NID Storage | 43 acre-ft |
| Max Storage | 43 acre-ft |
| Normal Storage | 35 acre-ft |
| Surface Area | 4 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 19 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Stemilt Irrigation District |
| Owner Type | Public Utility |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 05/22/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WA01476 |
| Federal ID | WA01476 |
| More Info | State Dam Safety Program |