Dejong Dam Reservoir Report

Last Updated: December 8, 2025

Dejong Dam, located in Marion County, Iowa, is a private earth dam designed by the USDA NRCS and completed in 1963.


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Summary

The dam serves multiple purposes, including fire protection and creating a stock or small fish pond, with a storage capacity of 470 acre-feet and a surface area of 27.3 acres. Situated on TR-ENGLISH CREEK, the dam is regulated by the Iowa Department of Natural Resources and undergoes regular inspections to ensure compliance with state standards.

With a height of 44 feet and a length of 538 feet, Dejong Dam has a low hazard potential and is considered to have a moderate risk level. Despite being uncontrolled, the spillway type of the dam ensures proper water management during high flow events. The dam's condition assessment is currently not rated, but it meets safety guidelines, and emergency preparedness measures are in place. Overall, Dejong Dam stands as a vital infrastructure for water resource management and climate resilience in the region, reflecting a commitment to protecting both human and environmental interests.

Year Completed

1963

Dam Length

538

Dam Height

44

River Or Stream

TR-ENGLISH CREEK

Primary Dam Type

Earth

Surface Area

27.3

Drainage Area

0.77

Nid Storage

470

Hazard Potential

Low

Foundations

Soil

Nid Height

44
       
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.