Upper Big Nemaha 9-a

About Upper Big Nemaha 9-a

The primary purpose of Upper Big Nemaha 9-a 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 Nemaha Natural Resources District (local government). It impounds the Tr-mid Br Big Nemaha River near Adams.

The dam stands 34 feet tall and stretches 866 feet across, creates a reservoir covering 9 acres, has a maximum storage capacity of 309 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1985, the structure is 41 years old.

This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. Its condition is rated poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 06/03/2020.

At 34 feet, this dam is taller than 80% of dams nationwide.

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