Trout Lake Storage Dam

About Trout Lake Storage Dam

The primary purpose of Trout Lake Storage Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Friday Harbor Town (local government). It impounds the Tr-false Bay.

The dam stands 37 feet tall and stretches 141 feet across, creates a reservoir covering 63 acres, has a maximum storage capacity of 1,540 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1929, the structure is well-established, with more than 75 years of service.

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 06/07/2023.

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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