Mader Dam 2 Reservoir Report

Last Updated: December 6, 2025

Mader Dam 2, located in Sioux, Nebraska, is a privately owned earth dam designed by the USDA NRCS and completed in 1957 for the primary purpose of irrigation.


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Summary

With a height of 20 feet and a length of 1192 feet, this dam has a storage capacity of 405 acre-feet and serves a drainage area of 1.1 square miles. The dam has a low hazard potential and is in satisfactory condition as of the last inspection in August 2019.

Managed by the Nebraska Department of Natural Resources, Mader Dam 2 is regulated, permitted, inspected, and enforced by state authorities to ensure its safe operation. The dam is situated along the TR-Indian Creek and has a maximum discharge capacity of 1700 cubic feet per second. Despite its age, Mader Dam 2 continues to provide essential irrigation water for agricultural purposes in the surrounding area, contributing to the sustainable management of water resources in the region.

As a key infrastructure for water supply and management in Ardmore SD, Nebraska, Mader Dam 2 plays a vital role in supporting the local agricultural community. With its stone core and soil foundation, the dam remains a reliable structure that helps control water flow and provides essential storage capacity during periods of high demand. Its continued maintenance and adherence to state regulations ensure the safety and effectiveness of this important water resource for years to come.

Year Completed

1957

Dam Length

1192

Dam Height

20

River Or Stream

TR-INDIAN CREEK

Primary Dam Type

Earth

Surface Area

18

Hydraulic Height

17

Drainage Area

1.1

Nid Storage

405

Structural Height

22

Hazard Potential

Low

Foundations

Soil

Nid Height

22
       
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.