Southwest Iowa Egg Cooperative Dam Reservoir Report
Nearby: Behnken Dam Holste Dam
Last Updated: December 14, 2025
The Southwest Iowa Egg Cooperative Dam, situated in Cass County, Iowa, stands as a vital water resource infrastructure designed by the USDA NRCS and completed in 1999.
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Summary
This private dam is primarily used for water supply purposes, serving as a critical source for fire protection, livestock, small fish ponds, and general water supply needs. With a height of 38 feet and a length of 710 feet, the dam has a storage capacity of 382 acre-feet and covers a surface area of 22 acres.
Managed and regulated by the Iowa DNR, this earth dam utilizes stone core types and soil foundations to maintain its structural integrity. Despite its low hazard potential and not being rated for condition assessment, the dam poses a moderate risk (3) according to risk assessment standards. The presence of an uncontrolled spillway underscores the importance of proper monitoring and maintenance practices to ensure the safety and efficiency of the dam. The Southwest Iowa Egg Cooperative Dam serves as a testament to the collaborative efforts of private ownership and state regulatory agencies in safeguarding water resources for the community's needs.
Year Completed |
1999 |
Dam Length |
710 |
Dam Height |
38 |
River Or Stream |
TR- ELM CREEK |
Primary Dam Type |
Earth |
Surface Area |
22 |
Drainage Area |
0.44 |
Nid Storage |
382 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
38 |
Seasonal Comparison
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Nearby Streamflow Levels
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.
Southwest Iowa Egg Cooperative Dam