Miller Subwatershed 3-2975 Reservoir Report
Last Updated: December 13, 2025
Miller Subwatershed 3-2975 is a local government-owned dam in Correctionville, Iowa, designed by 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, small fish pond, and flood risk reduction. With a height of 33 feet and a length of 200 feet, the dam has a storage capacity of 27 acre-feet and covers a surface area of 1 acre within its 0.13 square mile drainage area.
Located on the TR-Little Sioux River, this dam has a low hazard potential and a moderate risk assessment rating. Although the condition assessment is not rated, the dam meets state permitting, inspection, and enforcement requirements. While there are no associated structures or outlet gates, the dam's spillway type is uncontrolled. The risk management plan and emergency action preparedness status for this dam are currently unknown, along with the last inspection date and frequency.
Enthusiasts interested in water resources and climate in Woodbury County, Iowa, would find Miller Subwatershed 3-2975 a fascinating case study. This dam's historical significance, design features, and regulatory oversight by state agencies add depth to understanding the intersection of infrastructure, environmental protection, and emergency preparedness in a local context. Further research into the dam's risk management measures, condition assessment, and emergency action plan could provide valuable insights into its role in the broader watershed ecosystem and its resilience to climate variability.
Year Completed |
1960 |
Dam Length |
200 |
Dam Height |
33 |
River Or Stream |
TR-LITTLE SIOUX RIVER |
Primary Dam Type |
Earth |
Surface Area |
1 |
Drainage Area |
0.13 |
Nid Storage |
27 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
33 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Little Sioux River At Correctionville
|
327cfs |
Maple River At Mapleton
|
323cfs |
West Fork Ditch At Hornick
|
80cfs |
Floyd River At James
|
187cfs |
Missouri River At Sioux City
|
15100cfs |
Perry Creek Near Milnerville
|
25cfs |
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.
Miller Subwatershed 3-2975