Loch Leonard Dam

About Loch Leonard Dam

Loch Leonard Dam is a dam in Cass, Missouri. The dam is owned by Mo Public Service Compny (private). It impounds the Tributary Of Big Creek near Pleasant Hill.

The dam stands 19 feet tall, creates a reservoir covering 28 acres, has a maximum storage capacity of 285 acre-feet, and collects water from a drainage area of 108 square miles. Completed in 1909, 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. The most recent inspection on record was 06/21/1979. That was 46 years ago — unusually long for a high-hazard dam, which typically requires more frequent inspections.

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

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