Jasper County Roadgrade Dam 20-81-20 Reservoir Report
Last Updated: December 13, 2025
Jasper County Roadgrade Dam 20-81-20, located in Reasnor, Iowa, is a local government-owned structure designed by Michael Olson, the Jasper County Engineer.
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Summary
Completed in 2002, this earth dam serves the primary purpose of grade stabilization along TR-Clear Creek. With a height of 39 feet and a length of 910 feet, the dam has a storage capacity of 153 acre-feet and covers a surface area of 5.1 acres.
Managed by the Iowa Department of Natural Resources, Jasper County Roadgrade Dam 20-81-20 is regulated, permitted, inspected, and enforced by state authorities. With a low hazard potential and a moderate risk assessment rating, this dam plays a crucial role in managing water resources and mitigating potential flood risks in the region. Despite not being rated for condition assessment, the dam is in operation and meets state guidelines for emergency action preparedness.
This dam on TR-Clear Creek is an essential infrastructure for the local community, contributing to water resource management and flood control efforts in Jasper County. As an earth structure with a controlled spillway and a soil foundation, Jasper County Roadgrade Dam 20-81-20 stands as a testament to effective collaboration between local government agencies and state regulators in safeguarding the environment and ensuring public safety in the face of changing climatic conditions.
Year Completed |
2002 |
Dam Length |
910 |
Dam Height |
39 |
River Or Stream |
TR- CLEAR CREEK |
Primary Dam Type |
Earth |
Surface Area |
5.1 |
Drainage Area |
0.11 |
Nid Storage |
153 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
39 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Indian Creek Near Mingo
|
79cfs |
South Skunk River At Colfax
|
211cfs |
Fourmile Creek Near Ankeny
|
9cfs |
Timber Creek Near Marshalltown
|
37cfs |
Iowa River At Marshalltown
|
1040cfs |
Fourmile Creek At Des Moines
|
22cfs |
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.
Jasper County Roadgrade Dam 20-81-20