Madison County Roadgrade Dam 4-74-29 Reservoir Report
Last Updated: December 11, 2025
Madison County Roadgrade Dam 4-74-29 is a crucial structure located in Pammel State Park, Iowa, serving as a key part of the local water resource management system.
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Summary
Owned and regulated by the Iowa Department of Natural Resources, this earth dam stands at a height of 33 feet and spans 400 feet in length, with a storage capacity of 143 acre-feet. Completed in 1987, the dam's primary purpose is listed as 'Other', with a low hazard potential and moderate risk assessment rating.
Situated on the TR-Rocky Branch stream, this dam plays a significant role in flood control and water storage for the surrounding area, with a drainage area of 0.35 square miles. Despite not having a spillway, the structure is designed to manage water flow effectively, with a condition assessment of 'Not Rated'. While the dam has not been rated for emergency preparedness, its low hazard potential suggests a lesser immediate risk, although ongoing risk management measures are important to ensure its continued safe operation.
For water resource and climate enthusiasts, Madison County Roadgrade Dam 4-74-29 serves as a focal point for understanding the intersection of infrastructure, environmental regulation, and community resilience. As part of the local government's responsibility, the dam represents a balance between water management needs and potential risks, highlighting the ongoing importance of monitoring and maintenance in safeguarding both the structure and the surrounding ecosystem. By staying informed about the dam's status and engaging in discussions about its role in the broader water resource system, enthusiasts can contribute to sustainable practices and awareness of climate-related challenges in the region.
Year Completed |
1987 |
Dam Length |
400 |
Dam Height |
33 |
River Or Stream |
TR- ROCKY BRANCH |
Primary Dam Type |
Earth |
Surface Area |
5.5 |
Drainage Area |
0.35 |
Nid Storage |
143 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
33 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Raccoon River At Van Meter
|
1640cfs |
South Raccoon River At Redfield
|
268cfs |
Raccoon River Near West Des Moines
|
1300cfs |
North River Near Norwalk
|
48cfs |
Middle Raccoon River At Panora
|
92cfs |
Raccoon River At 63rd Street At Des Moines
|
587cfs |
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.
Madison County Roadgrade Dam 4-74-29