Warren Dam Reservoir Report

Last Updated: December 7, 2025

Warren Dam, located in Rathbun Reservoir, Iowa, is a privately-owned structure primarily designed for fire protection and as a stock or small fish pond.


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Summary

Constructed in 1998 by the USDA NRCS, this earth dam stands at 28 feet high and stretches 387 feet in length, with a storage capacity of 90 acre-feet. The dam is regulated by the Iowa DNR and undergoes regular inspections, with a low hazard potential and a moderate risk assessment rating.

The dam, situated on TR-Jackson Creek in Wayne County, Iowa, serves as a crucial water resource for the surrounding area. With a drainage area of 0.23 square miles, the reservoir covers 6.8 acres and has a normal storage capacity of 50 acre-feet. Despite its uncontrolled spillway type, Warren Dam is deemed to meet safety guidelines and poses a moderate risk level. Its location within the Rock Island District and under the ownership of a private entity highlights the collaborative effort in managing and maintaining water resources in the region.

Water resource and climate enthusiasts can appreciate Warren Dam's role in ensuring fire protection and supporting local aquatic life. As a privately-owned structure with state jurisdiction oversight, it serves as a testament to the importance of sustainable water management practices. The dam's construction by the USDA NRCS and its continuous regulation by the Iowa DNR demonstrate a commitment to environmental stewardship and water resource protection in Wayne County, Iowa, making it a significant asset in the region's water infrastructure.

Year Completed

1998

Dam Length

387

Dam Height

28

River Or Stream

TR-JACKSON CREEK

Primary Dam Type

Earth

Surface Area

6.8

Drainage Area

0.23

Nid Storage

90

Hazard Potential

Low

Foundations

Soil

Nid Height

28
       
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.