Dd No 5-20 Reservoir Report

Last Updated: December 13, 2025

Dd No 5-20 is a local government-owned dam located in Coffey County, Kansas, specifically in the city of Iola.


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Summary

Constructed with the primary purpose of flood risk reduction, this earth-type dam has a height of 17.5 feet and a length of 1370 feet. It has a storage capacity of 381.1 acre-feet and a drainage area of 0.86 square miles, with a maximum discharge of 660 cubic feet per second.

Managed by the Kansas Department of Agriculture, Dd No 5-20 is regulated, permitted, inspected, and enforced by the state agency. Despite being rated as having a low hazard potential, the dam's risk assessment is moderate, indicating a potential for future management measures to mitigate any identified risks. With its uncontrolled spillway type and a lack of outlet gates, this dam plays a crucial role in protecting the surrounding area from flooding events along the Long Creek-TR river or stream.

Overall, Dd No 5-20 is an essential infrastructure for flood risk reduction in the region, highlighting the importance of proper maintenance, inspection, and risk management to ensure its continued effectiveness in protecting the community and environment from potential hazards. As water resource and climate enthusiasts, understanding the details and functionalities of dams like Dd No 5-20 is crucial for promoting sustainable water management practices and resilience in the face of changing climate conditions.

Dam Length

1370

Dam Height

17.5

River Or Stream

LONG CREEK-TR

Primary Dam Type

Earth

Surface Area

12.14

Drainage Area

0.86

Nid Storage

381.1

Outlet Gates

None

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

18
       
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.