Mike Mikkelson Subwatershed M-10210 Reservoir Report
Last Updated: December 14, 2025
Located in Monona County, Iowa, the Mike Mikkelson Subwatershed M-10210 is a critical water resource managed by the local government for fire protection, stock, and small fish pond purposes.
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Summary
The dam, completed in 1960, is primarily an earth structure with a height of 25 feet and a length of 113 feet, providing a storage capacity of 43 acre-feet. The subwatershed has a drainage area of 3.19 square miles, with a low hazard potential and a moderate risk assessment rating.
Managed by the USDA NRCS, the Mike Mikkelson Subwatershed M-10210 is regulated and permitted by the Iowa DNR, ensuring compliance with state regulations for inspections and enforcement. The dam's spillway type is uncontrolled, and it is situated on the TR-Cottonwood Creek, contributing to flood risk reduction in the area. With a surface area of 2 acres and a normal storage capacity of 15 acre-feet, the subwatershed plays a crucial role in water management and conservation efforts in the region.
Overall, the Mike Mikkelson Subwatershed M-10210 serves as a vital water resource in Monona County, Iowa, providing essential functions for fire protection, stock, and small fish pond purposes. With a focus on flood risk reduction and conservation, the subwatershed demonstrates the importance of sustainable water management practices for climate resilience and ecosystem health in the region.
Year Completed |
1960 |
Dam Length |
113 |
Dam Height |
25 |
River Or Stream |
TR- COTTONWOOD CREEK |
Primary Dam Type |
Earth |
Surface Area |
2 |
Drainage Area |
3.19 |
Nid Storage |
43 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
25 |
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 M-10210