Windy Hill Subwatershed Site 3d-2 Reservoir Report
Last Updated: December 14, 2025
Windy Hill Subwatershed Site 3d-2 is a local government-owned structure located in Woodbury County, Iowa, with a primary purpose of serving as a fire protection, stock, or small fish pond, as well as for flood risk reduction.
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Summary
This earth dam was completed in 1975 and has a height of 33 feet, with a storage capacity of 137 acre-feet. Situated on the TR-West Fork Little Sioux river, this dam covers a surface area of 8 acres and has a drainage area of 0.62 square miles.
Managed by the USDA NRCS, Windy Hill Subwatershed Site 3d-2 is regulated by the Iowa DNR, with state permitting, inspection, and enforcement in place. The structure has a low hazard potential and a moderate risk assessment rating of 3. While the condition assessment is currently not rated, the dam's risk management measures and emergency action plan status are not specified. With its location in Rollly Springs and association with the Omaha District, this site plays a crucial role in water resource management and climate resilience efforts in the region.
For water resource and climate enthusiasts, Windy Hill Subwatershed Site 3d-2 offers a fascinating case study in local government ownership and management of a crucial earth dam structure. With its multiple purposes of fire protection, stock, and small fish pond maintenance, as well as flood risk reduction, this site exemplifies the intersection of human needs and environmental stewardship. The dam's history, design, and ongoing regulatory oversight by the Iowa DNR provide valuable insights into sustainable water management practices and infrastructure resilience in the face of changing climatic conditions.
Year Completed |
1975 |
Dam Length |
600 |
Dam Height |
33 |
River Or Stream |
TR-WEST FORK LITTLE SIOUX |
Primary Dam Type |
Earth |
Surface Area |
8 |
Drainage Area |
0.62 |
Nid Storage |
137 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
33 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
West Fork Ditch At Hornick
|
80cfs |
Missouri River At Sioux City
|
13700cfs |
Little Sioux River At Correctionville
|
327cfs |
Floyd River At James
|
187cfs |
Omaha Cr At Homer
|
45cfs |
Maple River At Mapleton
|
323cfs |
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.
Windy Hill Subwatershed Site 3d-2