Plattsmouth 18-A Reservoir Report
Nearby: Plattsmouth 12-A Plattsmouth 10-A
Last Updated: December 13, 2025
Plattsmouth 18-A, located in Cass County, Nebraska, is a crucial flood risk reduction structure along the TR-Missouri River.
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Summary
Built in 1959 by USDA NRCS, this earth dam stands at a height of 25 feet and spans 437 feet in length, with a storage capacity of 117 acre-feet. The dam plays a vital role in safeguarding the surrounding area from potential flooding, with a high hazard potential but a satisfactory condition assessment as of August 2020.
Managed by the local government and regulated by the Nebraska Department of Natural Resources, Plattsmouth 18-A is subject to regular inspections and enforcement to ensure its effectiveness in flood control. The dam's primary purpose is flood risk reduction, serving as a critical infrastructure in protecting the residents and properties in the city of Plattsmouth. With a drainage area of 0.24 square miles and a maximum discharge capacity of 895 cubic feet per second, this structure serves as a key component in the region's water resource management and climate resilience efforts.
Despite its age, Plattsmouth 18-A continues to fulfill its intended function effectively, with its operational and regulatory aspects meeting the necessary standards. With its strategic location and efficient design, this earth dam stands as a testament to the importance of sustainable water resource management and the crucial role of infrastructure in mitigating climate-related risks in vulnerable areas like Cass County, Nebraska.
Year Completed |
1959 |
Dam Length |
437 |
Dam Height |
25 |
River Or Stream |
TR-MISSOURI RIVER |
Primary Dam Type |
Earth |
Surface Area |
4 |
Hydraulic Height |
25 |
Drainage Area |
0.24 |
Nid Storage |
117 |
Structural Height |
30 |
Hazard Potential |
High |
Foundations |
Soil |
Nid Height |
30 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Weeping Water Creek At Union
|
20cfs |
Platte R At Louisville Ne
|
8100cfs |
West Nishnabotna River At Randolph
|
439cfs |
Missouri River At Omaha
|
17800cfs |
Missouri River At Nebraska City
|
25000cfs |
Platte R Nr Ashland
|
6290cfs |
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Area Campgrounds
| Location | Reservations | Toilets |
|---|---|---|
Pony Creek Co Park
|
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Glenwood Lake Park
|
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Offutt AFB Military
|
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FAMCamp
|
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Haworth City Park - Bellevue
|
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Camp Wakonda
|
Plattsmouth 18-A
Plattsmouth Boat Ramp