Windy Hill Subwatershed Site 5-1 Reservoir Report

Last Updated: December 13, 2025

Windy Hill Subwatershed Site 5-1, located in Woodbury County, Iowa, is a vital water resource managed by the local government for fire protection, livestock, and small fish pond purposes.


°F

°F

mph

Wind

%

Humidity

Summary

This earth dam, completed in 1975, stands at 36 feet high and spans 650 feet in length, with a storage capacity of 81 acre-feet. Situated along the TR-Little Sioux River-W Fork, this dam plays a crucial role in flood risk reduction for the surrounding area.

Managed by the USDA NRCS and regulated by the Iowa DNR, this dam is inspected, permitted, and enforced by state authorities to ensure its structural integrity and functionality. With a low hazard potential and a moderate risk assessment rating, Windy Hill Subwatershed Site 5-1 is a key component of the local water management infrastructure, providing both environmental and public safety benefits. Despite not being currently rated for condition assessment, this dam remains a critical asset in the region's water resource and climate resilience efforts.

Year Completed

1975

Dam Length

650

Dam Height

36

River Or Stream

TR-LITTLE SIOUX RIVER-W FORK

Primary Dam Type

Earth

Surface Area

5

Drainage Area

0.23

Nid Storage

81

Hazard Potential

Low

Foundations

Soil

Nid Height

36
       
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.