Zellmer Subwtrshd Sta 60+50 #A Reservoir Report
Last Updated: December 13, 2025
Zellmer Subwtrshd Sta 60+50 #A is a local government-owned structure located in Woodbury, Iowa, specifically in Rolly Springs.
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Summary
Built in 1964 by USDA NRCS, this earth dam serves multiple purposes including fire protection, stock, small fish pond, and flood risk reduction. With a height of 24 feet and a length of 399 feet, it has a storage capacity of 50 acre-feet and covers a surface area of 2.5 acres.
Managed by the Iowa Department of Natural Resources, this dam on the TR-West Fork Little Sioux River is equipped with an uncontrolled spillway. Despite its low hazard potential, it has a moderate risk assessment rating. The structure is inspected regularly by state authorities, ensuring its safety and functionality. With its strategic location and design, Zellmer Subwtrshd Sta 60+50 #A plays a crucial role in water resource management in the area and contributes to the overall resilience of the local ecosystem in the face of changing climate conditions.
Year Completed |
1964 |
Dam Length |
399 |
Dam Height |
24 |
River Or Stream |
TR-WEST FORK LITTLE SIOUX RIV |
Primary Dam Type |
Earth |
Surface Area |
2.5 |
Drainage Area |
0.37 |
Nid Storage |
50 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
24 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
West Fork Ditch At Hornick
|
80cfs |
Floyd River At James
|
187cfs |
Little Sioux River At Correctionville
|
327cfs |
Missouri River At Sioux City
|
15100cfs |
Omaha Cr At Homer
|
45cfs |
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.
Zellmer Subwtrshd Sta 60+50 #A