Grade Lake Dam

About Grade Lake Dam

The primary purpose of Grade Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by City Of Osceola (local government). It impounds the Tr-whitebreast Creek near Osceola.

The dam stands 44 feet tall and stretches 1,300 feet across, creates a reservoir covering 25 acres, has a maximum storage capacity of 865 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1900, 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 satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 05/23/2023.

At 44 feet, this dam is taller than 90% 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 Iowa dam safety program can provide more specific information about emergency planning for this structure.

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