Waiakalua Reservoir

About Waiakalua Reservoir

The primary purpose of Waiakalua Reservoir is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Allen, William P Rev Living Trust, Atkin,thomas R Revocable Living Trust, He Makana Ka Wai, Hunt Kilauea Llc, Matthew C Miller, Mr. Evan And Mrs. Erica Wollman, Theresa Drake, Victor Mission Trust Llc, William L. Flaherty, Trust (private). It impounds the Waiakalua Stream near Kilauea.

The dam stands 23 feet tall and stretches 1,200 feet across, creates a reservoir covering 13 acres, has a maximum storage capacity of 220 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1920, the structure is over a century 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 poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. An emergency action plan is in place for this dam. The most recent inspection on record was 02/22/2025.

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 Hawaii dam safety program can provide more specific information about emergency planning for this structure.

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