Gap Road Reservoir
Gap Road Reservoir is an earth dam located in Benton County, Washington, built in 2004. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Gap Road Reservoir
The primary purpose of Gap Road 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 Yakima River - Offstream near Prosser.
The dam stands 17 feet tall and stretches 1,800 feet across, creates a reservoir covering 3 acres, has a maximum storage capacity of 47 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 2004, 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 06/29/2021.
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 |
| Nearest City | Prosser |
| River/Stream | Yakima River - Offstream |
| Coordinates | 46.25397, -119.78898 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 17 ft |
| Dam Length | 1,800 ft |
| Year Completed | 2004 (22 years old) |
Storage & Hydraulics
| NID Storage | 47 acre-ft |
| Max Storage | 47 acre-ft |
| Normal Storage | 37 acre-ft |
| Surface Area | 3 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 10 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Zirkle Fruit Company |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 06/29/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WA01874 |
| Federal ID | WA01874 |
| More Info | State Dam Safety Program |