Wilson Creek 11-A Reservoir Report
Nearby: Wilson Creek 12-T Wilson Creek 12-S
Last Updated: December 6, 2025
Wilson Creek 11-A in Cass, Nebraska, is a locally-owned earth dam designed by USDA NRCS for flood risk reduction on the TR-N FK LITTLE NEMAHA RIVER.
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Summary
Completed in 1974, this dam stands 33 feet high with a length of 1110 feet, providing storage for 1588 acre-feet of water and covering a surface area of 56 acres. Despite its low hazard potential, the dam is currently in poor condition as of the last inspection in September 2019 and is regulated by the NE DNR.
Situated in the Kansas City District, Wilson Creek 11-A plays a crucial role in mitigating flood risks in the region, with a maximum discharge capacity of 1770 cubic feet per second. This dam is regularly inspected every 5 years and is subject to state permitting, inspection, and enforcement. However, its current condition assessment indicates the need for maintenance and upgrades to ensure its continued effectiveness in protecting the surrounding area from flooding events.
For water resource and climate enthusiasts, Wilson Creek 11-A presents an opportunity to study the management and maintenance challenges faced by local governments in sustaining critical infrastructure like earth dams. With its historical significance dating back to the 1970s, this dam serves as a reminder of the importance of proactive monitoring and upkeep to ensure the safety and functionality of essential flood control structures in the face of evolving climatic conditions and water resource management practices.
Year Completed |
1974 |
Dam Length |
1110 |
Dam Height |
32 |
River Or Stream |
TR-N FK LITTLE NEMAHA RIVER |
Primary Dam Type |
Earth |
Surface Area |
56 |
Hydraulic Height |
32 |
Drainage Area |
4 |
Nid Storage |
1588 |
Structural Height |
33 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
33 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Platte R At Louisville Ne
|
4630cfs |
Salt Creek At Greenwood
|
125cfs |
Weeping Water Creek At Union
|
20cfs |
Stevens Creek Nr. Lincoln
|
3cfs |
Platte R Nr Ashland
|
6290cfs |
Wahoo Cr At Ashland
|
78cfs |
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.
Wilson Creek 11-A