Hansen Dam Reservoir Report
Nearby: Percival/Putnam Dam Stratton Dam
Last Updated: December 13, 2025
Hansen Dam, located in Mingo, Iowa, serves multiple purposes including fire protection and as a stock or small fish pond.
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Summary
Completed in 1975, this earth dam stands at a height of 25 feet and has a length of 300 feet. With a storage capacity of 50 acre-feet, the dam also offers recreational opportunities with a surface area of 4 acres for visitors to enjoy.
Managed by the Iowa Department of Natural Resources, Hansen Dam is regulated, inspected, and enforced to ensure its safety and functionality. Despite having a low hazard potential, the dam is classified as having a moderate risk level. While the condition of the dam itself has not been rated, it is continuously monitored and maintained to mitigate any potential risks. With its strategic location along TR-WILLOW CREEK, Hansen Dam plays a crucial role in managing water resources in the area.
Climate and water resource enthusiasts will appreciate Hansen Dam for its contribution to flood control and water management in Story County, Iowa. As a key infrastructure maintained by the state, the dam's presence ensures the protection of nearby communities and wildlife habitats. With its serene surroundings and functional design, Hansen Dam stands as a testament to sustainable water resource management practices in the region.
Year Completed |
1975 |
Dam Length |
300 |
Dam Height |
25 |
River Or Stream |
TR-WILLOW CREEK |
Primary Dam Type |
Earth |
Surface Area |
4 |
Drainage Area |
0.13 |
Nid Storage |
50 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
25 |
Seasonal Comparison
Weather Forecast
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.
Hansen Dam