Mike Mikkelson Subwatershed 11-3227 Reservoir Report
Last Updated: December 14, 2025
Located in Monona County, Iowa, the Mike Mikkelson Subwatershed 11-3227 is a crucial water resource managed by the local government and regulated by the Iowa Department of Natural Resources.
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Summary
Designed by the USDA NRCS, this subwatershed serves multiple purposes including fire protection, stock, small fish ponds, and flood risk reduction. The primary dam type is earth, with a height of 28 feet and a storage capacity of 59 acre-feet.
Completed in 1960, this subwatershed covers a drainage area of 0.28 square miles and has a low hazard potential with a moderate risk assessment score of 3. Despite being not rated for condition assessment, the dam is regularly inspected and maintained by the state regulatory agency. The spillway type is uncontrolled, and the subwatershed has a surface area of 1 acre. With its strategic location along the TR- Cottonwood Creek, the Mike Mikkelson Subwatershed 11-3227 plays a vital role in water management and ecosystem protection in the region.
Year Completed |
1960 |
Dam Height |
28 |
River Or Stream |
TR- COTTONWOOD CREEK |
Primary Dam Type |
Earth |
Surface Area |
1 |
Drainage Area |
0.28 |
Nid Storage |
59 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
28 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Little Sioux River Near Turin
|
1040cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
Soldier River At Pisgah
|
112cfs |
Missouri River At Decatur
|
14900cfs |
Maple River At Mapleton
|
323cfs |
Boyer River At Logan
|
417cfs |
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 11-3227