Windy Hill Subwatershed Site 5b-1 Reservoir Report
Last Updated: December 14, 2025
Windy Hill Subwatershed Site 5b-1 in Woodbury County, Iowa, is a small earth dam completed in 1975 for multiple purposes, including fire protection, stock, small fish pond, and flood risk reduction.
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Summary
The dam has a height of 47 feet and a storage capacity of 67 acre-feet, with a normal storage level of 39 acre-feet. Despite its small size, the dam plays a crucial role in managing water resources in the area, especially for fire protection and flood risk reduction.
Located along the TR-West Fork Little Sioux river, this dam is regulated by the Iowa Department of Natural Resources and undergoes state inspections, permitting, and enforcement. With a low hazard potential and a moderate risk assessment score of 3, the dam is considered to be in a stable condition, although it has not been rated for its current condition. The dam's emergency action plan status and risk management measures are not specified, indicating potential areas for improvement in terms of preparedness and response in case of emergencies.
Managed by the local government and designed by the USDA NRCS, Windy Hill Subwatershed Site 5b-1 serves as a valuable asset for water resource management in the region. Its multi-purpose design highlights the importance of small-scale infrastructure in enhancing water security and resilience to climate change impacts. As water resource and climate enthusiasts, it is essential to recognize the significance of such structures in safeguarding communities and ecosystems against the growing challenges of water scarcity and extreme weather events.
Year Completed |
1975 |
Dam Length |
450 |
Dam Height |
47 |
River Or Stream |
TR-WEST FORK LITTLE SIOUX |
Primary Dam Type |
Earth |
Surface Area |
3 |
Drainage Area |
0.19 |
Nid Storage |
67 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
47 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
West Fork Ditch At Hornick
|
80cfs |
Little Sioux River At Correctionville
|
327cfs |
Floyd River At James
|
187cfs |
Missouri River At Sioux City
|
15100cfs |
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 5b-1