Farm Dam Reservoir Report
Last Updated: December 13, 2025
Farm Dam in Decatur, Iowa, serves multiple purposes including fire protection, stock, and small fish pond.
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Summary
Built in 1987 by USDA NRCS, this private dam stands at 30 feet tall and spans 415 feet in length, with a capacity to hold 29 acre-feet of water. Located along the TR- Thompson River, this earth dam with a soil foundation is regulated by the Iowa DNR and undergoes regular inspections and enforcement to ensure safety and compliance.
With a low hazard potential and a moderate risk assessment rating, Farm Dam is considered a crucial water resource in the area, providing essential functions for both agricultural and ecological purposes. Although the dam is currently in a "Not Rated" condition, its design and purpose indicate its importance in the local landscape. The dam's proximity to Westerville and its strategic location within the drainage area further highlight its significance in water management and conservation efforts.
Managed by private owners and supported by the Natural Resources Conservation Service, Farm Dam showcases the collaborative efforts between government agencies and private entities in safeguarding water resources. As a key feature in the Rock Island District, this dam plays a vital role in maintaining water supply, mitigating potential risks, and supporting sustainable practices in water resource management. Its presence underscores the importance of investing in infrastructure for climate resilience and ensuring the long-term sustainability of water systems in the region.
Year Completed |
1987 |
Dam Length |
415 |
Dam Height |
30 |
River Or Stream |
TR- THOMPSON R. |
Primary Dam Type |
Earth |
Surface Area |
2.5 |
Drainage Area |
0.06 |
Nid Storage |
40 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
30 |
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.
Farm Dam