Selah Aerated Lagoon
Selah Aerated Lagoon is an earth dam located in Yakima County, Washington, built in 1985. It carries a High hazard potential classification and has a fair condition assessment.
About Selah Aerated Lagoon
Selah Aerated Lagoon is a dam in Yakima, Washington. The dam is owned by Selah City - Wastewater Treatment Plant (local government). It impounds the Tr-yakima River-offstream near Selah.
The dam stands 11 feet tall and stretches 1,180 feet across, creates a reservoir covering 18 acres, and has a maximum storage capacity of 26 acre-feet. Completed in 1985, the structure is 41 years old.
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 09/28/2021.
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 | Yakima |
| Nearest City | Selah |
| River/Stream | Tr-yakima River-offstream |
| Coordinates | 46.64925, -120.52150 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 11 ft |
| Dam Length | 1,180 ft |
| Year Completed | 1985 (41 years old) |
Storage & Hydraulics
| NID Storage | 26 acre-ft |
| Max Storage | 26 acre-ft |
| Normal Storage | 20 acre-ft |
| Surface Area | 18 acres |
Ownership & Safety
| Purpose | Other |
| Owner | Selah City - Wastewater Treatment Plant |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Fair |
| Last Inspection | 09/28/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WA01478 |
| Federal ID | WA01478 |
| More Info | State Dam Safety Program |