Dd No 9 Reservoir Report

Last Updated: December 5, 2025

Dd No 9 is a dam located in Hessdale, Kansas, along the East Branch Mill Creek.


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Summary

Built in 2001, this earth dam stands at a height of 39.8 feet and has a storage capacity of 639 acre-feet. Its primary purpose is flood risk reduction, serving as a vital infrastructure for protecting the surrounding area from potential flooding events.

Managed by the Kansas Department of Agriculture, Dd No 9 is classified as a low hazard potential dam with a moderate risk assessment rating. Despite not being rated for condition assessment, this structure plays a crucial role in regulating water flow and managing the drainage area of 3.34 square miles. In the event of emergency, the dam has an uncontrolled spillway with a width of 175 feet to ensure controlled water release.

With its strategic location and design, Dd No 9 exemplifies the importance of effective water resource management in mitigating flood risks in Wabaunsee County, Kansas. As climate change continues to impact weather patterns, structures like Dd No 9 will be essential in safeguarding communities and infrastructure against the threats of flooding and water-related disasters.

Year Completed

2001

Dam Length

680

Dam Height

39.8

River Or Stream

EAST BRANCH MILL CREEK

Primary Dam Type

Earth

Surface Area

13.9

Drainage Area

3.34

Nid Storage

639

Outlet Gates

None

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

40
       
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.