Jennings Lake Reservoir Report

Last Updated: December 13, 2025

Jennings Lake in Decatur, Kansas, is a picturesque reservoir with a primary purpose of recreation.


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Summary

Built in 1937, this earth dam stands at 27 feet tall and spans 590 feet in length, providing a storage capacity of 2,227 acre-feet. With a surface area of 161 acres and a normal storage capacity of 807 acre-feet, Jennings Lake offers opportunities for fishing, boating, and other outdoor activities for water resource and climate enthusiasts to enjoy.

Managed by the local government and regulated by the Kansas Department of Agriculture, the dam at Jennings Lake boasts a controlled spillway with a width of 440 feet. The risk assessment for this structure is categorized as very high, indicating the potential for significant hazards. Though the condition assessment is currently not rated, the reservoir's undetermined hazard potential calls for ongoing monitoring and management to ensure the safety and sustainability of this vital water resource in Kansas.

Located within the Omaha District, Jennings Lake is a vital water resource in the region, offering not only recreational opportunities but also serving as a key element in the local water management system. With its historical significance dating back to the 1930s, this reservoir continues to play a crucial role in water supply and climate resilience efforts in Decatur County. As climate change impacts water resources, Jennings Lake stands as a testament to the importance of sustainable water management practices in the face of evolving environmental challenges.

Year Completed

1937

Dam Length

590

Dam Height

27

Primary Dam Type

Earth

Surface Area

161

Drainage Area

1130.31

Nid Storage

2227

Outlet Gates

None

Hazard Potential

Undetermined

Foundations

Unlisted/Unknown

Nid Height

27
       
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.
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