Roza Diversion Dam is a concrete dam located in Kittitas County, Washington, built in 1939. It carries a Low hazard potential classification.
Dam profile
NID height · 67 ft67 ft tall and 486 ft long, taller than 96% of U.S. dams with a recorded height. Height is drawn to scale against a ten-story building, about 100 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About Roza Diversion Dam
The primary purpose of Roza Diversion Dam is hydroelectric. The dam generates hydroelectric power by channeling water through turbines, converting the energy of flowing water into electricity. The dam is owned by Bureau of Reclamation (federal). It impounds the Yakima River near Yakima.
The dam stands 67 feet tall and stretches 486 feet across, creates a reservoir covering 100 acres, has a maximum storage capacity of 100 acre-feet, and collects water from a drainage area of 1,785 square miles. Completed in 1939, the structure is well-established, with more than 75 years of service.
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 11/08/2023.
At 67 feet, this dam is taller than 96% of all dams in the United States.
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Location
| State | Washington |
| County | Kittitas |
| Nearest City | Yakima |
| River/Stream | Yakima River |
| Coordinates | 46.74910, -120.46590 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 67 ft |
| Dam Height | 32 ft |
| Dam Length | 486 ft |
| Year Completed | 1939 (87 years old) |
Storage & Hydraulics
| NID Storage | 100 acre-ft |
| Max Storage | 100 acre-ft |
| Normal Storage | 100 acre-ft |
| Surface Area | 100 acres |
| Drainage Area | 1,785 sq mi |
| Max Discharge | 50,000 cfs |
| Spillway Type | None |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | Bureau of Reclamation |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 11/08/2023 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WA00275 |
| Federal ID | WA00275 |
| More Info | State Dam Safety Program |