Grandview Wastewater Aqua Lagoon Dam is an earth dam located in Yakima County, Washington, built in 1999. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 10 ft10 ft tall and 2,080 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Grandview Wastewater Aqua Lagoon Dam
Grandview Wastewater Aqua Lagoon Dam is a dam in Yakima, Washington. The dam is owned by Grandview City Hall (local government). It impounds the Yakima River.
The dam stands 10 feet tall and stretches 2,080 feet across, has a maximum storage capacity of 66 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1999, the structure is 27 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. 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 10/02/2024.
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Location
| State | Washington |
| County | Yakima |
| River/Stream | Yakima River |
| Coordinates | 46.21009, -119.91101 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 10 ft |
| Dam Length | 2,080 ft |
| Year Completed | 1999 (27 years old) |
Storage & Hydraulics
| NID Storage | 66 acre-ft |
| Max Storage | 66 acre-ft |
| Normal Storage | 55 acre-ft |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Other |
| Owner | Grandview City Hall |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 10/02/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WA00755 |
| Federal ID | WA00755 |
| More Info | State Dam Safety Program |