Roche Pomona Dam
Roche Pomona Dam is an earth dam located in Yakima County, Washington, built in 1995. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Roche Pomona Dam
The primary purpose of Roche Pomona Dam is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Roche Fruit Company (private). It impounds the Unnamed Trib - Yakima R. near Sealh.
The dam stands 23 feet tall and stretches 1,150 feet across, creates a reservoir covering 4 acres, has a maximum storage capacity of 48 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1995, the structure is 31 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 11/12/2019.
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 | Yakima |
| Nearest City | Sealh |
| River/Stream | Unnamed Trib - Yakima R. |
| Coordinates | 46.69372, -120.45575 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 23 ft |
| Dam Length | 1,150 ft |
| Year Completed | 1995 (31 years old) |
Storage & Hydraulics
| NID Storage | 48 acre-ft |
| Max Storage | 48 acre-ft |
| Normal Storage | 30 acre-ft |
| Surface Area | 4 acres |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Roche Fruit Company |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 11/12/2019 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WA01918 |
| Federal ID | WA01918 |
| More Info | State Dam Safety Program |