Windy Hill Subwatershed Site 5-4 Reservoir Report
Last Updated: December 14, 2025
Windy Hill Subwatershed Site 5-4 is a vital water resource in Woodbury County, Iowa, owned and regulated by the local government with assistance from the USDA NRCS.
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Summary
This Earth dam, completed in 1975, serves multiple purposes including fire protection, stock, small fish pond, and flood risk reduction. With a dam height of 34 feet and a storage capacity of 100 acre-feet, it covers a surface area of 5 acres and drains a 0.19 square mile watershed.
Situated along the TR-West Fork Little Sioux river, this dam's spillway type is uncontrolled, with a low hazard potential and a moderate risk assessment rating. Although the condition assessment is not rated, the dam is inspected, regulated, and permitted by the Iowa Department of Natural Resources. While there have been no modifications or emergency action plans recorded to date, the dam's risk management measures are yet to be detailed. Despite these uncertainties, this structure plays a crucial role in water management and conservation efforts within the region.
As part of the Omaha District, Windy Hill Subwatershed Site 5-4 is a significant component of the local ecosystem and a key player in maintaining water quality and availability. Its strategic location, purposeful design, and multiple functionalities make it a noteworthy site for water resource and climate enthusiasts to study and appreciate in the broader context of sustainable water management practices.
Year Completed |
1975 |
Dam Length |
380 |
Dam Height |
34 |
River Or Stream |
TR-WEST FORK LITTLE SIOUX |
Primary Dam Type |
Earth |
Surface Area |
5 |
Drainage Area |
0.19 |
Nid Storage |
100 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
34 |
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 5-4