Upper Loop Reservoir
Upper Loop Reservoir is an earth dam located in Chelan County, Washington, built in 2015. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Upper Loop Reservoir
The primary purpose of Upper Loop Reservoir is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Kyle Mathison Orchards Inc. (private). It impounds the Off Stream, Tr- Stemilt near Malaga.
The dam stands 47 feet tall and stretches 1,200 feet across, and has a maximum storage capacity of 118 acre-feet. Completed in 2015, the structure is relatively new.
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 09/22/2020.
At 47 feet, this dam is taller than 92% of dams nationwide.
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 | Off Stream, Tr- Stemilt |
| Coordinates | 47.31877, -120.26568 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 47 ft |
| Dam Length | 1,200 ft |
| Year Completed | 2015 (11 years old) |
Storage & Hydraulics
| NID Storage | 118 acre-ft |
| Max Storage | 118 acre-ft |
| Normal Storage | 99 acre-ft |
| Max Discharge | 17 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Kyle Mathison Orchards Inc. |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 09/22/2020 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WA00743 |
| Federal ID | WA00743 |
| More Info | State Dam Safety Program |