Delzell Dam Reservoir Report

Last Updated: December 6, 2025

Delzell Dam, located in Milton, Iowa, was completed in 2003 and serves multiple purposes including fire protection, stock, and small fish pond management.


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Summary

The dam, primarily owned and regulated by private entities, stands at 21 feet high with a length of 395 feet, providing a storage capacity of 143 acre-feet. Situated on the TR- FOX RIVER, the dam's low hazard potential and moderate risk assessment make it a crucial asset for water resource management in the area.

Managed by NRCS, Delzell Dam is constructed with an earth foundation and uncontrolled spillway type. Despite not being rated for condition assessment, the dam's state-regulated status ensures regular inspections and enforcement measures to maintain its functionality. With a drainage area of 0.47 square miles and a surface area of 9.1 acres, the dam plays a significant role in water storage and management within the region.

Delzell Dam's strategic location in Davis County, Iowa, under the jurisdiction of the IOWA DNR, highlights its importance in the local ecosystem. As a key structure for water resource management, the dam provides essential services for fire protection, livestock, and fisheries while maintaining a low hazard potential. With its modern design and regulatory oversight, Delzell Dam stands as a vital asset for climate enthusiasts and water resource professionals alike, ensuring sustainable water management practices in the region.

Year Completed

2003

Dam Length

395

Dam Height

21

River Or Stream

TR- FOX RIVER

Primary Dam Type

Earth

Surface Area

9.1

Drainage Area

0.47

Nid Storage

143

Hazard Potential

Low

Foundations

Soil

Nid Height

21
       
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.
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Area Campgrounds