Koekenhoff Dam Reservoir Report

Last Updated: December 9, 2025

Koekenhoff Dam, located in Emmet County, Iowa, is a private Earth dam completed in 2006 for the primary purpose of creating a Fish and Wildlife Pond.


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Summary

Managed by the Iowa Department of Natural Resources, this dam on the TR-Des Moines River has a height of 13 feet and a length of 180 feet, with a storage capacity of 108 acre-feet. With a surface area of 9.1 acres and a drainage area of 1.67 square miles, this dam serves as a vital habitat for various wildlife species in the area.

Despite being classified as having a low hazard potential, Koekenhoff Dam is under moderate risk assessment due to its location and design. The dam features an uncontrolled spillway with a width of 45 feet and is regularly inspected and regulated by the Iowa DNR. While the condition assessment is currently not rated, the dam meets all state permitting and inspection requirements, ensuring the safety and integrity of the structure for both the wildlife and surrounding community.

With its strategic location and purposeful design, Koekenhoff Dam stands as a testament to the importance of water resource management for wildlife conservation. As a focal point for fish and wildlife habitat enhancement, this dam plays a crucial role in supporting the ecosystem and enhancing the biodiversity of the TR-Des Moines River. Through continued monitoring and risk management measures, Koekenhoff Dam remains a valuable asset for both wildlife enthusiasts and climate advocates alike.

Year Completed

2006

Dam Length

180

Dam Height

13

River Or Stream

TR- DES MOINES RIVER

Primary Dam Type

Earth

Surface Area

9.1

Drainage Area

1.67

Nid Storage

108

Hazard Potential

Low

Foundations

Soil

Nid Height

13
       
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.