Wayne County Road Dam 26-70-22 Reservoir Report

Last Updated: December 8, 2025

Wayne County Road Dam 26-70-22, located in Rathbun Reservoir, Iowa, is a local government-owned structure designed by the Wayne County Engineer.


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Summary

The dam is regulated by the Iowa Department of Natural Resources and is used for grade stabilization along the TR- South Fork Chariton River. Completed in 2002, the earth dam stands at a height of 24 feet with a length of 580 feet, providing a storage capacity of 82 acre-feet and covering a surface area of 3.7 acres.

With a low hazard potential and a moderate risk assessment rating of 3, Wayne County Road Dam 26-70-22 is considered a relatively safe structure. Although the condition assessment is listed as "Not Rated," the dam is inspected, permitted, and enforced by the state regulatory agency, ensuring its compliance with safety standards. The dam features an uncontrolled spillway with a width of 2 feet and is designed for grade stabilization purposes to manage the flow of water in the area.

Water resource and climate enthusiasts interested in Wayne County Road Dam 26-70-22 will appreciate its role in managing water flow along the TR- South Fork Chariton River and its contribution to grade stabilization efforts in the region. The dam's location in Rathbun Reservoir, Iowa, highlights its importance in maintaining water levels and protecting the surrounding environment. Despite its low hazard potential, ongoing inspections and regulatory oversight by the Iowa DNR ensure the safety and reliability of this vital infrastructure.

Year Completed

2002

Dam Length

580

Dam Height

24

River Or Stream

TR- SOUTH FORK CHARITON RIVER

Primary Dam Type

Earth

Surface Area

3.7

Drainage Area

0.55

Nid Storage

82

Hazard Potential

Low

Foundations

Soil

Nid Height

24
       
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.