Paterson Ranch Reservoir
Paterson Ranch Reservoir is an earth dam located in Benton County, Washington, built in 2010. It carries a High hazard potential classification and has a fair condition assessment.
About Paterson Ranch Reservoir
The primary purpose of Paterson Ranch Reservoir is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Zirkle Fruit Company (private). It impounds the Offstream - Columbia R..
The dam stands 23 feet tall and stretches 1,510 feet across, creates a reservoir covering 3 acres, and has a maximum storage capacity of 50 acre-feet. Completed in 2010, 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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 10/13/2021.
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 | Benton |
| River/Stream | Offstream - Columbia R. |
| Coordinates | 45.95155, -119.58003 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 23 ft |
| Dam Length | 1,510 ft |
| Year Completed | 2010 (16 years old) |
Storage & Hydraulics
| NID Storage | 50 acre-ft |
| Max Storage | 50 acre-ft |
| Normal Storage | 40 acre-ft |
| Surface Area | 3 acres |
| Max Discharge | 5 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Zirkle Fruit Company |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Fair |
| Last Inspection | 10/13/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WA01995 |
| Federal ID | WA01995 |
| More Info | State Dam Safety Program |