Hadler Detention Reservoir Report

Last Updated: December 6, 2025

Hadler Detention, located in Mazeppa, Minnesota, is a private earth dam designed by NRCS in 1981 for flood risk reduction along Trout Brook.


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Summary

The dam stands at 30 feet tall with a length of 210 feet, providing a storage capacity of 35.6 acre-feet to manage runoff in the area. The dam is state-regulated and undergoes regular inspections, with a low hazard potential and satisfactory condition assessment as of the last inspection in 2016.

Owned privately, Hadler Detention serves as a critical infrastructure in Goodhue County for mitigating flood risks and protecting surrounding areas from potential inundation. Its primary purpose aligns with flood risk reduction efforts, with a moderate risk assessment rating. The dam's location, design, and operational functions are integral to water resource management in the region, reflecting a commitment to climate resilience and hazard mitigation in a changing environment. As part of the broader network of water infrastructure in Minnesota, Hadler Detention plays a vital role in maintaining the safety and sustainability of the local watershed.

Year Completed

1981

Dam Length

210

Dam Height

26

River Or Stream

TROUT BROOK-TR

Primary Dam Type

Earth

Drainage Area

0.5

Nid Storage

35.6

Structural Height

30

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

30
       
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.