Codr Grade Stabilization Dam Reservoir Report

Last Updated: December 5, 2025

Codr Grade Stabilization Dam, located in Palmyra, Nebraska, is a privately owned structure designed by the USDA NRCS to address flood risk reduction and other purposes along the TR-Little Nemaha River.


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Summary

Completed in 1996, this earth dam stands at a height of 31 feet and has a drainage area of 0.6 square miles, providing a maximum storage capacity of 156 acre-feet. Despite its low hazard potential, the dam's current condition is assessed as poor, signaling a need for maintenance and improvements.

Managed by the Nebraska Department of Natural Resources, Codr Grade Stabilization Dam is subject to state regulations and inspections to ensure its safety and functionality. The dam's design includes stone core types and soil foundations, contributing to its structural integrity and hydraulic efficiency. With a maximum discharge capacity of 234 cubic feet per second, this dam plays a crucial role in managing water flow and mitigating potential flooding in the region.

Although the dam's emergency action plan and risk assessment details are not specified in the available data, ongoing monitoring and maintenance efforts are essential to uphold the dam's operational readiness and safeguard nearby communities and ecosystems from water-related risks. As enthusiasts of water resources and climate, understanding the importance of structures like Codr Grade Stabilization Dam highlights the critical role they play in enhancing water management and resilience in the face of changing climatic conditions.

Year Completed

1996

Dam Length

562

Dam Height

31

River Or Stream

TR-LITTLE NEMAHA RIVER

Primary Dam Type

Earth

Surface Area

6

Hydraulic Height

26

Drainage Area

0.6

Nid Storage

156

Structural Height

27

Hazard Potential

Low

Foundations

Soil

Nid Height

31
       
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.