Lake Belle-ann Dam

About Lake Belle-ann Dam

The primary purpose of Lake Belle-ann Dam is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Wm & Grace Beaver (private). It impounds the Tr College Creek near Marthasville.

The dam stands 29 feet tall, creates a reservoir covering 6 acres, has a maximum storage capacity of 93 acre-feet, and collects water from a drainage area of 128 square miles. Completed in 1960, the structure is well into its service life at over 50 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. The most recent inspection on record was 05/15/1979. 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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