Allison 1 Cat Dam Reservoir Report
Nearby: Allison 2 Cat Dam Holzberger Dam
Last Updated: December 11, 2025
Allison 1 Cat Dam, located in Nebraska, was completed in 1983 and serves the primary purpose of debris control on the TR-Wounded Knee Creek.
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Summary
Owned by the local government, this earth dam stands at a height of 24 feet and has a storage capacity of 80 acre-feet. The dam has a low hazard potential and is in satisfactory condition, as assessed in May 2020. The dam is regulated by the Nebraska Department of Natural Resources and undergoes regular inspections to ensure its safety and functionality.
Designed by USDA NRCS, Allison 1 Cat Dam is constructed with a stone core and soil foundation, with a length of 250 feet and a surface area of 9 acres. With a normal storage capacity of 15 acre-feet, the dam plays a crucial role in managing runoff and protecting downstream areas from debris and sedimentation. The dam is located in Sheridan County, Nebraska, near Wounded Knee, South Dakota, and falls under the jurisdiction of the Omaha District of the US Army Corps of Engineers.
Enthusiasts of water resources and climate change will find Allison 1 Cat Dam to be a vital infrastructure for maintaining water quality and controlling debris in the TR-Wounded Knee Creek watershed. With its regulated status, satisfactory condition, and low hazard potential, the dam represents a successful collaboration between local government agencies, federal designers, and state regulators in ensuring the safety and resilience of water infrastructure in the region.
Year Completed |
1983 |
Dam Length |
250 |
Dam Height |
24 |
River Or Stream |
TR-WOUNDED KNEE CREEK |
Primary Dam Type |
Earth |
Surface Area |
9 |
Hydraulic Height |
24 |
Drainage Area |
1 |
Nid Storage |
80 |
Structural Height |
26 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
26 |
Seasonal Comparison
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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.
Allison 1 Cat Dam