Mike Mikkelson Subwatershed 5-5020 Reservoir Report
Last Updated: December 14, 2025
Located in Monona, Iowa, the Mike Mikkelson Subwatershed 5-5020 is a vital water resource managed by the local government with oversight from the Iowa Department of Natural Resources.
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Summary
This subwatershed is designed to serve multiple purposes including fire protection, stock maintenance, and flood risk reduction. With a dam height of 50 feet and a storage capacity of 82 acre-feet, the structure was completed in 1970 and covers a drainage area of 0.56 square miles.
Despite its low hazard potential, the subwatershed poses a moderate risk due to its proximity to the TR-Little Maple River. Managed by the Natural Resources Conservation Service, the dam serves as a critical component of the local ecosystem, providing essential water storage and flood control capabilities. While the overall condition of the structure is currently unrated, regular inspections and maintenance ensure its operational efficiency for the surrounding community of Little Sioux.
With a surface area of 3.1 acres and a normal storage capacity of 36 acre-feet, the Mike Mikkelson Subwatershed 5-5020 plays a crucial role in water resource management and climate resilience efforts in the region. As climate change continues to impact water availability and extreme weather events, the subwatershed serves as a valuable asset in mitigating potential risks and ensuring sustainable water access for the local population.
Year Completed |
1970 |
Dam Length |
113 |
Dam Height |
50 |
River Or Stream |
TR-LITTLE MAPLE RIVER |
Primary Dam Type |
Earth |
Surface Area |
3.1 |
Drainage Area |
0.56 |
Nid Storage |
82 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
50 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Maple River At Mapleton
|
323cfs |
Little Sioux River Near Turin
|
1040cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
West Fork Ditch At Hornick
|
80cfs |
Missouri River At Decatur
|
14900cfs |
Soldier River At Pisgah
|
112cfs |
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 5-5020