Plattsmouth 4-a

About Plattsmouth 4-a

The primary purpose of Plattsmouth 4-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 City Of Plattsmouth (local government). It impounds the Tr-missouri River near Plattsmouth.

The dam stands 34 feet tall and stretches 259 feet across, creates a reservoir covering 1 acres, has a maximum storage capacity of 16 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1962, 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. 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 05/01/2024.

At 34 feet, this dam is taller than 80% 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 Nebraska dam safety program can provide more specific information about emergency planning for this structure.

Search for dams near your address to see all dams in your area with hazard classifications and safety data.