Walling Subwatershed Sta 57+84 #1b Reservoir Report
Last Updated: December 13, 2025
Walling Subwatershed Sta 57+84 #1b is a local government-owned earth dam located in Woodbury County, Iowa, near the city of Oto.
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Summary
The dam was completed in 1953 and serves multiple purposes including fire protection, stock watering, small fish pond management, and flood risk reduction. With a height of 51 feet and a length of 400 feet, the dam has a storage capacity of 56 acre-feet and covers a surface area of 3.4 acres. The drainage area for the dam is 0.21 square miles, and it is regulated by the Iowa Department of Natural Resources.
Despite being classified as having a low hazard potential, Walling Subwatershed Sta 57+84 #1b is considered to have a moderate risk level of 3. The condition of the dam is currently not rated, and there is no information available on the last inspection date or frequency. The dam is equipped with an uncontrolled spillway and has not undergone any modifications in recent years. While the emergency action plan status and risk management measures for the dam are not specified, it is clear that the structure plays a crucial role in water resource management and protection in the area.
Overall, Walling Subwatershed Sta 57+84 #1b stands as a significant infrastructure for water conservation and flood control in the Little Sioux River watershed. As climate change continues to impact water resources, monitoring and maintaining the integrity of such structures will be essential for ensuring the safety and sustainability of the surrounding communities. With its historical significance and vital role in local water management, Walling Subwatershed Sta 57+84 #1b serves as a key focal point for water resource and climate enthusiasts seeking to understand the intersection of infrastructure, environmental conservation, and climate resilience.
Year Completed |
1953 |
Dam Length |
400 |
Dam Height |
51 |
River Or Stream |
TR-LITTLE SIOUX RIVER |
Primary Dam Type |
Earth |
Surface Area |
3.4 |
Drainage Area |
0.21 |
Nid Storage |
56 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
51 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Little Sioux River At Correctionville
|
327cfs |
Maple River At Mapleton
|
323cfs |
West Fork Ditch At Hornick
|
80cfs |
Little Sioux River Near Turin
|
1040cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
Floyd River At James
|
187cfs |
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.
Walling Subwatershed Sta 57+84 #1b