Ob-3 Process Water Storage Lagoon 2

About Ob-3 Process Water Storage Lagoon 2

The primary purpose of Ob-3 Process Water Storage Lagoon 2 is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Ob-3 Resource Management, Llc (private). It impounds the Offstream Drains Tolind Coulee near Warden.

The dam stands 37 feet tall and stretches 4,350 feet across, and has a maximum storage capacity of 651 acre-feet. Completed in 2021, 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. An emergency action plan is in place for this dam.

At 37 feet, this dam is taller than 84% of dams nationwide.

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.

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