Simonsen Subwatershed Sta 123+48 Main Reservoir Report
Last Updated: December 13, 2025
Located in Cherokee, Iowa, the Simonsen Subwatershed Sta 123+48 Main is a critical water resource infrastructure managed by the local government with design support from the USDA NRCS.
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Summary
This earth dam, completed in 1952, serves multiple purposes such as fire protection, stock maintenance, and small fish pond management, while also contributing to flood risk reduction in the area. With a dam height of 33 feet and a storage capacity of 137 acre-feet, this structure plays a key role in managing water resources in the region.
The dam, situated on Rock Creek, covers a drainage area of 0.86 square miles and has a surface area of 4.4 acres. Despite its low hazard potential, the structure's condition remains unrated, with moderate risk assessment indicating the need for ongoing monitoring and potential management measures. With state regulation and enforcement in place, including permitting and inspection requirements by the Iowa DNR, the Simonsen Subwatershed Sta 123+48 Main demonstrates a commitment to ensuring the safety and sustainability of water resources in the area.
As a part of the broader water resource management strategy in the region, this dam contributes to the overall resilience of the local ecosystem and community against flood events. With its historical significance and ongoing operational importance, the Simonsen Subwatershed Sta 123+48 Main serves as a valuable asset for water resource and climate enthusiasts interested in understanding the intersection of infrastructure, environmental stewardship, and climate adaptation in Iowa's water management landscape.
Year Completed |
1952 |
Dam Length |
400 |
Dam Height |
33 |
River Or Stream |
ROCK CREEK |
Primary Dam Type |
Earth |
Surface Area |
4.4 |
Drainage Area |
0.86 |
Nid Storage |
137 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
33 |
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 |
Floyd River At James
|
187cfs |
Maple River At Mapleton
|
323cfs |
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.
Simonsen Subwatershed Sta 123+48 Main