Hatfield Dam Reservoir Report
Last Updated: December 12, 2025
Located in Afton, Iowa, the Hatfield Dam is a private-owned structure designed by Don Tresemer and completed in 1999.
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Summary
This Earth-type dam stands at a height of 27 feet and stretches 570 feet in length, with a storage capacity of 221 acre-feet. The primary purpose of the dam is for fire protection and to serve as a stock or small fish pond, making it a valuable resource for the local community.
Situated on Twelvemile Creek, the Hatfield Dam is regulated by the Iowa Department of Natural Resources and is subject to state inspection and enforcement. With a low hazard potential and a moderate risk assessment, this dam plays a crucial role in managing water resources in the area. Despite not being rated for its condition assessment, the Hatfield Dam continues to provide essential services while meeting state permitting requirements.
Water resource and climate enthusiasts can appreciate the Hatfield Dam for its contribution to the local ecosystem and its role in mitigating potential risks. With its uncontrolled spillway and moderate risk level, this structure showcases the importance of sustainable water management practices. As a private-owned facility in Iowa, the Hatfield Dam stands as a testament to the collaboration between private entities and state regulatory agencies in ensuring the safety and efficiency of water infrastructure.
Year Completed |
1999 |
Dam Length |
570 |
Dam Height |
27 |
River Or Stream |
TR- TWELVEMILE CREEK |
Primary Dam Type |
Earth |
Surface Area |
18.3 |
Drainage Area |
0.54 |
Nid Storage |
221 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
27 |
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.
Hatfield Dam