Prosser Diversion Dam is a concrete dam located in Benton County, Washington, built in 1904. It carries a Low hazard potential classification.
Dam profile
NID height · 9 ft9 ft tall and 661 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About Prosser Diversion Dam
The primary purpose of Prosser Diversion Dam is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Bureau of Reclamation (federal). It impounds the Yakima River near Prosser.
The dam stands 9 feet tall and stretches 661 feet across, and has a maximum storage capacity of 350 acre-feet. Completed in 1904, the structure is over a century old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. The most recent inspection on record was 09/24/2019.
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Location
| State | Washington |
| County | Benton |
| Nearest City | Prosser |
| River/Stream | Yakima River |
| Coordinates | 46.21260, -119.77290 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 9 ft |
| Dam Height | 9 ft |
| Dam Length | 661 ft |
| Year Completed | 1904 (122 years old) |
Storage & Hydraulics
| NID Storage | 350 acre-ft |
| Max Storage | 350 acre-ft |
| Normal Storage | 350 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Bureau of Reclamation |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 09/24/2019 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WA01378 |
| Federal ID | WA01378 |
| More Info | State Dam Safety Program |