Wayne Co. Roadgrade Dam 16-69-21 Reservoir Report
Last Updated: December 7, 2025
Wayne Co.
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Summary
Roadgrade Dam 16-69-21 is a crucial water resource structure located in Wayne County, Iowa, specifically in the city of Rathbun Reservoir. Constructed in 1996 by the Wayne County Engineer, this earth dam stands at a height of 22 feet and spans 670 feet in length. It serves a primary purpose of "Other" and is regulated by the Iowa Department of Natural Resources (DNR), with state permitting, inspection, and enforcement in place.
This dam plays a vital role in controlling the flow of the TR- S. FK. Chariton River and has a storage capacity of 60 acre-feet. Despite being rated as having a low hazard potential, it is considered to have a moderate risk level with a rating of 3. The dam has not been assessed for its condition but is deemed to be in good standing. While it does not have associated structures or outlet gates, it is equipped with an uncontrolled spillway. Overall, Wayne Co. Roadgrade Dam 16-69-21 is a significant component of the water infrastructure in the region, contributing to flood control and water management efforts.
Year Completed |
1996 |
Dam Length |
670 |
Dam Height |
22 |
River Or Stream |
TR- S. FK. CHARITON RIVER |
Primary Dam Type |
Earth |
Surface Area |
4 |
Drainage Area |
0.15 |
Nid Storage |
60 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
22 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
Wayne Co. Roadgrade Dam 16-69-21
Corydon Lake