Sietmann Dam Reservoir Report
Nearby: Kolls Dam Bagnall Dam
Last Updated: December 15, 2025
Located in Marshall County, Iowa, the Sietmann Dam is a private-owned structure with a primary purpose of fire protection, stock, or small fish pond.
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Summary
Built in 1961 by the USDA NRCS, this earth dam stands at a height of 22 feet and has a length of 430 feet, providing a storage capacity of 55 acre-feet. The dam is regulated, permitted, inspected, and enforced by the Iowa Department of Natural Resources, ensuring its safety and compliance with state regulations.
Situated on TR-Alloway Creek, the Sietmann Dam serves as a crucial water resource for the surrounding area, with a surface area of 3.9 acres and a drainage area of 0.25 square miles. Despite its low hazard potential and moderate risk assessment, the dam's condition is currently not rated. Although it does not have outlet gates or a controlled spillway, the dam's uncontrolled spillway type allows for the safe release of excess water during high flow events, minimizing the risk of flooding downstream.
Overall, the Sietmann Dam plays a significant role in providing water for fire protection, livestock, and recreational activities in Kellogg, Iowa. With its historical significance dating back to the 1960s, the dam continues to be a valuable asset for the community and a testament to the importance of proper water resource management and climate resilience.
Year Completed |
1961 |
Dam Length |
430 |
Dam Height |
22 |
River Or Stream |
TR-ALLOWAY CREEK |
Primary Dam Type |
Earth |
Surface Area |
3.9 |
Drainage Area |
0.25 |
Nid Storage |
55 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
22 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Timber Creek Near Marshalltown
|
37cfs |
Iowa River At Marshalltown
|
1040cfs |
Indian Creek Near Mingo
|
79cfs |
South Skunk River At Colfax
|
211cfs |
Richland Creek Near Haven
|
12cfs |
Walnut Creek Near Hartwick
|
13cfs |
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.
Sietmann Dam