E.T. Mahoney S Park Dam Reservoir Report

Last Updated: December 13, 2025

E.T.


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Summary

Mahoney State Park Dam, located in South Bend, Nebraska, stands as a vital water resource and recreational hub along the TR-PAWNEE CREEK. Built in 1988, this earth dam with stone core serves primarily for recreation purposes, offering a serene environment for visitors to enjoy various outdoor activities. With a structural height of 34 feet and a maximum storage capacity of 46 acre-feet, the dam provides a peaceful retreat for water resource and climate enthusiasts to explore.

Managed by the Nebraska Department of Natural Resources, E.T. Mahoney State Park Dam boasts a low hazard potential and satisfactory condition assessment. The dam undergoes regular inspections and maintenance, ensuring its safety and longevity for continued recreational use. Its location within Cass County, Nebraska, makes it a popular destination for locals and tourists seeking a tranquil setting to connect with nature and appreciate the importance of responsible water resource management.

In addition to providing a recreational oasis, E.T. Mahoney State Park Dam serves as a testament to the state's commitment to maintaining water infrastructure for both public enjoyment and environmental conservation. With its well-maintained facilities and scenic surroundings, the dam stands as a testament to the harmonious coexistence of human recreation and natural ecosystems, making it a must-visit destination for water resource and climate enthusiasts seeking to witness the beauty and resilience of Nebraska's aquatic landscapes.

Year Completed

1988

Dam Length

285

Dam Height

29

River Or Stream

TR-PAWNEE CREEK

Primary Dam Type

Earth

Surface Area

4

Hydraulic Height

26

Drainage Area

0.2

Nid Storage

46

Structural Height

34

Hazard Potential

Low

Foundations

Soil

Nid Height

34
       
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.