Heisler Creek Subwtrshd Sta 39+84 #3 Reservoir Report
Last Updated: December 14, 2025
Heisler Creek Subwatershed Station 39+84 #3 is a key water resource infrastructure in Woodbury County, Iowa, designed by the USDA NRCS and regulated by the Iowa DNR.
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Summary
Completed in 1960, this earth dam serves multiple purposes including fire protection, stock, and small fish pond management, as well as flood risk reduction. With a dam height of 46 feet and a storage capacity of 73 acre-feet, this structure plays a crucial role in managing water resources in the area.
Located in the city of Hornick along the West Fork Little Sioux River, this dam has a low hazard potential and is currently rated as "Not Rated" in terms of its condition assessment. The structure spans 500 feet in length, with a drainage area of 0.2 square miles and a surface area of 2.8 acres. While the spillway type is categorized as "Uncontrolled," the risk assessment for this dam is considered moderate. Despite not being associated with any federal agencies, Heisler Creek Subwatershed Station 39+84 #3 remains a significant feature in the local water management landscape.
Overall, Heisler Creek Subwatershed Station 39+84 #3 stands as a testament to the importance of local government-owned water infrastructure in safeguarding communities against flooding and ensuring sustainable water resource management. As climate change continues to impact the region, structures like this earth dam play a critical role in maintaining water security and mitigating potential risks to the surrounding environment and population.
Year Completed |
1960 |
Dam Length |
500 |
Dam Height |
46 |
River Or Stream |
TR-WEST FORK LITTLE SIOUX RIV |
Primary Dam Type |
Earth |
Surface Area |
2.8 |
Drainage Area |
0.2 |
Nid Storage |
73 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
46 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
West Fork Ditch At Hornick
|
80cfs |
Missouri River At Sioux City
|
13700cfs |
Omaha Cr At Homer
|
45cfs |
Floyd River At James
|
187cfs |
Little Sioux River At Correctionville
|
327cfs |
Maple River At Mapleton
|
323cfs |
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.
Heisler Creek Subwtrshd Sta 39+84 #3