Jeffrey Dike No 1 Reservoir Report

Last Updated: December 5, 2025

Jeffrey Dike No 1, located in Lincoln, Nebraska, is a public utility structure primarily used for irrigation purposes.


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Summary

This earth dam, completed in 1941, has a height of 10 feet and a length of 2265 feet, providing storage of up to 6937 acre-feet of water. The dam serves a drainage area of 13.6 square miles and is regulated by the Federal Energy Regulatory Commission.

Despite its low hazard potential, Jeffrey Dike No 1 is considered to have a high risk level, with a risk assessment rating of 2. The dam has not undergone a recent condition assessment, but it is inspected regularly with a frequency of one inspection per year. The emergency action plan for the dam was last revised in 1999, and it is currently unclear if it meets the necessary guidelines for risk management.

With its strategic location and importance for irrigation and water supply in the region, Jeffrey Dike No 1 stands as a crucial infrastructure for water resource management in Nebraska. As climate change impacts water resources, monitoring and maintaining the safety of structures like Jeffrey Dike No 1 will be essential to ensure the resilience of water systems in the face of changing environmental conditions.

Year Completed

1941

Dam Length

2265

Dam Height

10

River Or Stream

Supply Canal

Primary Dam Type

Earth

Surface Area

5756

Hydraulic Height

7

Drainage Area

13.6

Nid Storage

6937

Structural Height

10

Hazard Potential

Low

Nid Height

10
       
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.