Wayne Co. Roadgrade Dam 21-69-20 Reservoir Report

Last Updated: April 22, 2026

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Wayne Co.


Summary

Roadgrade Dam 21-69-20, located in Rathbun Reservoir, Iowa, is a local government-owned structure regulated by the Iowa DNR. Completed in 1993, the earth dam stands at a height of 29 feet and spans 750 feet, with a storage capacity of 108 acre-feet. The dam serves a primary purpose of "Other" and is designed to control the flow of the TR-South Fork Chariton River.

With a low hazard potential and a moderate risk assessment rating, Wayne Co. Roadgrade Dam 21-69-20 is a vital component of water resource management in the area. Despite not being rated for condition assessment, the dam is regularly inspected by state authorities, meeting all necessary regulatory guidelines. Its location in a scenic and environmentally sensitive area underscores the importance of its role in mitigating flood risks and ensuring the safety of surrounding communities and ecosystems.

15-Day Long Term Forecast


Year Completed

1993

Dam Length

750

Dam Height

29

River Or Stream

TR-SOUTH FORK CHARITON RIVER

Primary Dam Type

Earth

Surface Area

5.6

Drainage Area

0.43

Nid Storage

108

Hazard Potential

Low

Foundations

Soil

Nid Height

29
       
Seasonal Comparison

5-Day Hourly Forecast Detail

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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