Windy Hill Subwatershed Site 3-2 Reservoir Report

Last Updated: December 14, 2025

Windy Hill Subwatershed Site 3-2, located in Woodbury County, Iowa, is a local government-owned earth dam constructed in 1975 by the USDA NRCS for multiple purposes including fire protection, stock, small fish pond, and flood risk reduction.


°F

°F

mph

Wind

%

Humidity

Summary

The dam stands at a height of 42 feet, with a length of 640 feet and a storage capacity of 188 acre-feet. Situated along the TR-West Fork Little Sioux river, the dam covers a drainage area of 0.82 square miles and serves as a crucial infrastructure for water resource management in the region.

Despite being categorized as having a low hazard potential and a moderate risk level, the condition of Windy Hill Subwatershed Site 3-2 is currently not rated. The dam is regulated by the Iowa DNR and undergoes regular state inspections, permitting, and enforcement to ensure its structural integrity and safety. With its location in a vital watershed area, the dam plays a significant role in mitigating flood risks and providing essential water storage for the surrounding community. Enthusiasts interested in water resource management and climate resilience will find Windy Hill Subwatershed Site 3-2 to be a noteworthy example of sustainable infrastructure supporting environmental conservation efforts in Iowa.

Year Completed

1975

Dam Length

640

Dam Height

42

River Or Stream

TR-WEST FORK LITTLE SIOUX

Primary Dam Type

Earth

Surface Area

9

Drainage Area

0.82

Nid Storage

188

Hazard Potential

Low

Foundations

Soil

Nid Height

42
       
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.