Dd No 21 Reservoir Report

Last Updated: December 5, 2025

Dd No 21, located in Pottawatomie County, Kansas, is a crucial flood risk reduction structure designed by F.


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Summary

V. Robbins and completed in 2009. This earth dam stands at a height of 42 feet and spans 680 feet in length, with a storage capacity of 691 acre-feet and a drainage area of 2.48 square miles. The dam is regulated by the Kansas Department of Agriculture and undergoes regular inspections to ensure its structural integrity and effectiveness in mitigating flood risks along Wilson Creek.

With a significant hazard potential and a moderate risk assessment rating, Dd No 21 plays a vital role in protecting the surrounding community from potential flooding events. The dam features an uncontrolled spillway with a width of 40 feet and has no outlet gates. Despite its condition being not rated, the dam is subject to a rigorous inspection schedule every 5 years to assess any maintenance or repair needs. The structure is owned and operated by the local government, highlighting the collaborative effort in safeguarding water resources and enhancing climate resilience in the region.

As a key component in the flood risk reduction infrastructure of Kansas, Dd No 21 serves as a critical defense against potential inundation and protects downstream areas from the impacts of high discharge events. With its strategic location and hydraulic height considerations, the dam effectively manages floodwaters from Wilson Creek, ensuring the safety and well-being of the local community. The structure's construction and design reflect a commitment to sustainable water resource management and climate adaptation, underscoring the importance of proactive measures in safeguarding against natural disasters.

Year Completed

2009

Dam Length

680

Dam Height

42

River Or Stream

WILSON CREEK - TR

Primary Dam Type

Earth

Surface Area

11.4

Drainage Area

2.48

Nid Storage

691

Structural Height

42

Outlet Gates

None

Hazard Potential

Significant

Foundations

Unlisted/Unknown

Nid Height

42
       
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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.