Windy Hill Subwatershed Site 5-3 Reservoir Report

Last Updated: December 14, 2025

Located in Woodbury County, Iowa, the Windy Hill Subwatershed Site 5-3 is a vital water resource managed by the local government with oversight from the Iowa Department of Natural Resources.


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Summary

This site, designed by the USDA NRCS, serves multiple purposes including fire protection, stock watering, and small fish pond maintenance. Built in 1975, the earth dam stands at a height of 52 feet and has a storage capacity of 320 acre-feet to regulate the flow of the TR-West Fork Little Sioux River.

With a low hazard potential and moderate risk assessment, the Windy Hill Subwatershed Site 5-3 plays a crucial role in flood risk reduction for the surrounding area. The dam has not been rated for its condition assessment, and there are no recent inspection dates available. Despite this, the site meets state regulatory standards and is subject to regular inspections, permitting, and enforcement by the Iowa DNR. The dam's primary purpose highlights its importance in safeguarding the local ecosystem and community against potential water-related emergencies.

Year Completed

1975

Dam Length

550

Dam Height

52

River Or Stream

TR-WEST FORK LITTLE SIOUX

Primary Dam Type

Earth

Surface Area

15

Drainage Area

0.51

Nid Storage

320

Hazard Potential

Low

Foundations

Soil

Nid Height

52
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.