Windy Hill Subwatershed Site 2-2 Reservoir Report
Last Updated: December 14, 2025
Windy Hill Subwatershed Site 2-2, located in Woodbury, Iowa, is a vital water resource managed by the local government and designed by the USDA NRCS.
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Summary
Completed in 1975, this earth dam stands at a height of 33 feet and serves purposes such as fire protection, stock, small fish pond, and flood risk reduction. With a storage capacity of 65 acre-feet and a surface area of 3 acres, this dam plays a crucial role in managing water resources in the area.
Situated along the TR-West Fork Little Sioux river, Windy Hill Subwatershed Site 2-2 is regulated by the Iowa DNR and falls under the jurisdiction of the state. Despite being classified as having a low hazard potential, the dam is rated as being in moderate risk condition. While the inspection frequency, emergency preparedness, and risk management measures are not specified in the data, the structure is noted as having not been rated in terms of its condition assessment.
With its strategic location and multiple purposes, including flood risk reduction, Windy Hill Subwatershed Site 2-2 is a critical component of the water resource management infrastructure in the area. As climate change continues to impact the frequency and intensity of extreme weather events, the importance of such structures in safeguarding communities and ecosystems from the impacts of flooding and water scarcity cannot be overstated.
Year Completed |
1975 |
Dam Length |
475 |
Dam Height |
33 |
River Or Stream |
TR-WEST FORK LITTLE SIOUX |
Primary Dam Type |
Earth |
Surface Area |
3 |
Drainage Area |
0.63 |
Nid Storage |
65 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
33 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
West Fork Ditch At Hornick
|
80cfs |
Little Sioux River At Correctionville
|
327cfs |
Missouri River At Sioux City
|
13700cfs |
Floyd River At James
|
187cfs |
Maple River At Mapleton
|
323cfs |
Omaha Cr At Homer
|
45cfs |
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 2-2