Dd No 26 Reservoir Report

Last Updated: December 5, 2025

Dd No 26, a local government-owned dam located in Wabaunsee, Kansas, serves the primary purpose of flood risk reduction along the West Branch Mill Creek.


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Summary

Constructed in 1995, this earth dam stands at a height of 37.2 feet and has a length of 800 feet, providing a storage capacity of 636 acre-feet and a maximum discharge of 1522 cubic feet per second. With a surface area of 17.5 acres and a drainage area of 2.26 square miles, Dd No 26 plays a crucial role in mitigating the potential impacts of flooding in the region.

Managed by the Kansas Department of Agriculture, Dd No 26 is regulated, inspected, and enforced by the state government to ensure its safety and functionality. Despite being classified as a low hazard potential structure with a moderate risk assessment rating, the dam's condition assessment remains unrated. With an uncontrolled spillway type and no outlet gates, Dd No 26 embodies a vital infrastructure asset in the region's water resource and climate management efforts, warranting continued monitoring and risk management measures to uphold its flood risk reduction capabilities.

In the face of evolving climate patterns and increasing water resource challenges, Dd No 26 stands as a testament to the critical role of infrastructure in safeguarding communities against the impacts of flooding. As water resource and climate enthusiasts, understanding the design, purpose, and regulatory framework of dams like Dd No 26 is essential for fostering resilience and sustainability in the face of a changing climate. By staying informed and engaged in the management of such vital structures, enthusiasts can contribute to the preservation of water resources and the protection of communities against the threats posed by extreme weather events and flooding.

Year Completed

1995

Dam Length

800

Dam Height

37.2

River Or Stream

WEST BRANCH MILL CREEK-TR

Primary Dam Type

Earth

Surface Area

17.5

Drainage Area

2.26

Nid Storage

636

Outlet Gates

None

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

37
       
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.