Dd No 21

About Dd No 21

The primary purpose of Dd No 21 is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Rock Creek Wd No 45 (local government). It impounds the Wilson Creek - Tr.

The dam stands 42 feet tall and stretches 680 feet across, creates a reservoir covering 11 acres, has a maximum storage capacity of 691 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 2009, the structure is relatively new.

This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 08/24/2021.

At 42 feet, this dam is taller than 89% of dams nationwide.

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