Greencrest Farms Dam Reservoir Report
Nearby: Jim Walter Dam Perrin Dam
Last Updated: December 12, 2025
Greencrest Farms Dam, located in Macksburg, Iowa, was completed in 1976 and serves multiple purposes including fire protection, stock, and small fish pond.
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Summary
Designed by USDA NRCS, this private-owned earth dam stands at a height of 37 feet with a length of 420 feet. It holds a storage capacity of 62 acre-feet, making it crucial for water resource management in the region.
Despite its low hazard potential, Greencrest Farms Dam is regulated by the Iowa DNR and undergoes regular inspections and enforcement. Situated on the Thompson River, this dam plays a vital role in flood control and water storage for the surrounding area. The dam's spillway is uncontrolled, and with a moderate risk assessment rating, it highlights the importance of proper management and maintenance to ensure its structural integrity and safety.
With its location in Adair County and close proximity to the Rock Island District, Greencrest Farms Dam is a significant feature in the local water resource infrastructure. As climate change continues to impact water availability and extreme weather events, the dam's role in managing water resources for fire protection and agriculture becomes increasingly crucial. As water resource and climate enthusiasts, understanding and supporting the maintenance of dams like Greencrest Farms Dam is essential for sustainable water management practices in the face of a changing climate.
Year Completed |
1976 |
Dam Length |
420 |
Dam Height |
37 |
River Or Stream |
TR-THOMPSON RIVER |
Primary Dam Type |
Earth |
Surface Area |
5.1 |
Drainage Area |
0.16 |
Nid Storage |
62 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
37 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
South Raccoon River At Redfield
|
268cfs |
Raccoon River At Van Meter
|
1640cfs |
Middle Raccoon River At Panora
|
92cfs |
Raccoon River Near West Des Moines
|
1300cfs |
North River Near Norwalk
|
48cfs |
Raccoon River At 63rd Street At Des Moines
|
587cfs |
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.
Greencrest Farms Dam