Twelve Mile Creek Watershed Site 71 Reservoir Report
Last Updated: December 12, 2025
Twelve Mile Creek Watershed Site 71, located in Union County, Iowa, is a vital water resource managed by the local government for various purposes including fire protection, stock, and small fish pond maintenance.
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Summary
Built in 1993 by USDA NRCS, this earth dam stands at a height of 23 feet and spans a length of 642 feet, with a storage capacity of 71 acre-feet and a surface area of 4.3 acres. The dam is regulated by the Iowa Department of Natural Resources and undergoes regular inspections, ensuring its functionality and safety.
Despite being classified as having a low hazard potential, Twelve Mile Creek Watershed Site 71 poses a moderate risk due to its location and size, prompting the need for risk management measures. The dam's purpose of flood risk reduction further underscores its importance in the local ecosystem and community resilience. While the dam is not federally owned, it serves as a critical infrastructure for water management in the region, showcasing the collaborative efforts between local and state agencies in safeguarding water resources and mitigating potential risks.
With its strategic position along the Twelve Mile Creek and its significant storage capacity, Twelve Mile Creek Watershed Site 71 plays a crucial role in water conservation and management in the area. As a designated state-regulated structure, it not only provides essential services for fire protection and agriculture but also serves as a buffer against potential flooding events. The dam's construction and maintenance by USDA NRCS demonstrate a commitment to sustainable water resource management and environmental stewardship, ensuring the continued functionality and safety of this important infrastructure for years to come.
Year Completed |
1993 |
Dam Length |
642 |
Dam Height |
23 |
River Or Stream |
TR- TWELVE MILE CREEK |
Primary Dam Type |
Earth |
Surface Area |
4.3 |
Drainage Area |
0.29 |
Nid Storage |
71 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
23 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
South Raccoon River At Redfield
|
268cfs |
Raccoon River At Van Meter
|
1640cfs |
East Fork 102 River At Bedford
|
1cfs |
Raccoon River Near West Des Moines
|
1300cfs |
Middle Raccoon River At Panora
|
92cfs |
Thompson River At Davis City
|
22cfs |
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.
Twelve Mile Creek Watershed Site 71
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