Mike Mikkelson Subwatershed 5-18280 Reservoir Report
Last Updated: December 14, 2025
Located in Monona County, Iowa, the Mike Mikkelson Subwatershed 5-18280 is a crucial water resource managed by the USDA NRCS.
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Summary
This subwatershed plays a significant role in fire protection, stock maintenance, and flood risk reduction, with a primary dam type of earth. Completed in 1960, the dam stands at a height of 27 feet and has a storage capacity of 30 acre-feet, serving a drainage area of 2.26 square miles.
Despite being categorized as low hazard potential, the subwatershed is recognized as having a moderate risk level, suggesting the need for active risk management measures. The dam, situated on the TR- Cottonwood Creek, serves as a lifeline for the local community of Little Sioux by providing essential services and safeguarding against potential flooding events. The state-regulated dam is under the supervision of the Iowa DNR, ensuring that it meets all necessary inspection and enforcement requirements.
In the realm of water resource and climate management, the Mike Mikkelson Subwatershed 5-18280 stands as a testament to the importance of sustainable infrastructure for both human needs and environmental protection. With its strategic location and critical functions, this subwatershed exemplifies the intersection of water conservation, community resilience, and regulatory oversight in safeguarding our natural resources for future generations.
Year Completed |
1960 |
Dam Height |
27 |
River Or Stream |
TR- COTTONWOOD CREEK |
Primary Dam Type |
Earth |
Surface Area |
4 |
Drainage Area |
2.26 |
Nid Storage |
30 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
27 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Little Sioux River Near Turin
|
1040cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
Soldier River At Pisgah
|
112cfs |
Maple River At Mapleton
|
323cfs |
Missouri River At Decatur
|
14900cfs |
West Fork Ditch At Hornick
|
80cfs |
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.
Mike Mikkelson Subwatershed 5-18280