Mortenson Subwatershed Sta99+92 Main Reservoir Report
Last Updated: December 13, 2025
Located in Cherokee, Iowa, the Mortenson Subwatershed Sta99+92 Main is a dam with a primary purpose of fire protection, stock, or small fish pond, as well as flood risk reduction.
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Summary
Built in 1950 by the USDA NRCS, this earth dam stands at a height of 41 feet and has a storage capacity of 285 acre-feet. With a low hazard potential and a moderate risk assessment rating, this structure plays a crucial role in managing water resources in the area.
The dam is regulated by the Iowa DNR and is subject to state inspection, permitting, and enforcement. Situated on TR-SILVER CREEK, this dam covers a drainage area of 1.39 square miles and has a surface area of 6.9 acres. Despite not having any associated structures or outlet gates, the Mortenson Subwatershed Sta99+92 Main is a key feature in the water management infrastructure of the region.
For water resource and climate enthusiasts, the Mortenson Subwatershed Sta99+92 Main offers a fascinating insight into the intersection of dam engineering, environmental regulation, and risk management. With its historical significance and ongoing role in flood control and water storage, this structure serves as a testament to the importance of sustainable water resource management practices in the face of changing climate patterns and increasing water demands.
Year Completed |
1950 |
Dam Length |
400 |
Dam Height |
41 |
River Or Stream |
TR-SILVER CREEK |
Primary Dam Type |
Earth |
Surface Area |
6.9 |
Drainage Area |
1.39 |
Nid Storage |
285 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
41 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Little Sioux River At Correctionville
|
327cfs |
Little Sioux River At Linn Grove
|
257cfs |
Floyd River At Alton
|
36cfs |
North Raccoon River Near Sac City
|
312cfs |
Maple River At Mapleton
|
323cfs |
Ocheyedan River Near Spencer
|
59cfs |
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.
Mortenson Subwatershed Sta99+92 Main