Sprague Wastewater Treatment Lagoons

About Sprague Wastewater Treatment Lagoons

Sprague Wastewater Treatment Lagoons is a dam in Lincoln, Washington. The dam is owned by Sprague City (local government). It impounds the Offstream near Sprague.

The dam stands 14 feet tall and stretches 3,570 feet across, creates a reservoir covering 107 acres, has a maximum storage capacity of 240 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1993, the structure is 33 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 08/24/2021.

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.

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