Dd No H-20 Reservoir Report

Last Updated: December 13, 2025

Dd No H-20, also known as Upper Pottawatomie Creek, is a flood risk reduction structure located in Anderson County, Kansas.


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Summary

Owned by the local government and regulated by the Kansas Department of Agriculture, this dam was designed by the USDA NRCS and serves the primary purpose of reducing flood risks along the Dry Branch river or stream. With a height of 45 feet and a hydraulic height of 41 feet, this buttress-type dam spans 1715 feet and has a storage capacity of 2109 acre-feet.

Situated in Lane, Kansas, Dd No H-20 has a low hazard potential and is currently not rated for condition assessment. The dam does not have any associated structures and has not undergone recent inspections or maintenance. Despite its status, it plays a crucial role in mitigating flood risks in the area, with a maximum discharge capacity of 1760 cubic feet per second and a spillway width of 250 feet. As a key piece of infrastructure in the region, it is important to monitor and maintain Dd No H-20 to ensure its effectiveness in protecting the surrounding community from potential flooding events.

Dam Length

1715

Dam Height

45

River Or Stream

DRY BRANCH

Hydraulic Height

41

Nid Storage

2109

Structural Height

45

Outlet Gates

None

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

45
       
Seasonal Comparison

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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.