Garnett Dam Reservoir Report

Last Updated: December 9, 2025

Garnett Dam, located in Lucas, Iowa, was completed in 1985 by the USDA NRCS and is primarily used for fire protection, stock, and small fish pond purposes.


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Summary

This earth dam stands at a height of 29 feet and stretches 290 feet in length, with a storage capacity of 26 acre-feet. Situated on the TR- WHITE BREAST CREEK, the dam serves to regulate water flow and provide essential resources for the surrounding area.

Managed by the Iowa Department of Natural Resources, Garnett Dam is classified as a low hazard potential structure with a moderate risk assessment rating. While the dam has not been officially rated for its condition, it undergoes regular state inspections and enforcement to ensure its operational integrity. With a surface area of 1.4 acres and a drainage area of 0.17 square miles, the dam plays a crucial role in maintaining water resources and mitigating potential climate-related risks in the region.

Despite its uncontrolled spillway type, Garnett Dam continues to serve as a vital water management structure in Clarke County, Iowa. With its strategic location and design, the dam not only supports local water supply needs but also contributes to environmental conservation efforts in the area. As water resource and climate enthusiasts, it is important to recognize the significance of Garnett Dam in safeguarding the natural landscape and promoting sustainable water usage practices for future generations.

Year Completed

1985

Dam Length

290

Dam Height

29

River Or Stream

TR- WHITE BREAST CREEK

Primary Dam Type

Earth

Surface Area

1.4

Drainage Area

0.17

Nid Storage

26

Hazard Potential

Low

Foundations

Soil

Nid Height

29
       
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.