Mike Mikkelson Subwatershed 9-2555 Reservoir Report
Last Updated: December 14, 2025
Mike Mikkelson Subwatershed 9-2555 is a water resource project located in Monona, Iowa, specifically in the city of Little Sioux.
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Summary
This project, designed by USDA NRCS, serves multiple purposes including fire protection, stock, small fish pond, and flood risk reduction. The primary dam type is earth, with a dam height of 31 feet and a storage capacity of 44 acre-feet, completed in 1960.
Managed by the Iowa DNR, this project is state-regulated and has state permitting, inspection, and enforcement in place. The dam has a low hazard potential and is not currently rated in terms of condition assessment. While the risk assessment is moderate, with a risk level of 3, there are no specific risk management measures identified at this time. The project is not associated with USACE and does not currently have an emergency action plan in place.
Overall, the Mike Mikkelson Subwatershed 9-2555 project plays a crucial role in water management and conservation efforts in the region. With its strategic location and multiple purposes, including flood risk reduction, this project highlights the importance of sustainable water resource management in mitigating potential hazards and ensuring the safety and well-being of the surrounding community.
Year Completed |
1960 |
Dam Height |
31 |
River Or Stream |
TR- COTTONWOOD CREEK |
Primary Dam Type |
Earth |
Surface Area |
3 |
Drainage Area |
0.88 |
Nid Storage |
44 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
31 |
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
|
15500cfs |
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 9-2555