Walling Subwatershed Sta 42+05 #4 Reservoir Report
Last Updated: December 14, 2025
Located in Woodbury County, Iowa, the Walling Subwatershed Sta 42+05 #4 is a crucial water resource managed by the local government with oversight from the Iowa Department of Natural Resources.
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Summary
Originally completed in 1953, this earth dam serves multiple purposes including fire protection, stock maintenance, and flood risk reduction along the TR-Little Sioux River. With a dam height of 48 feet and a storage capacity of 109 acre-feet, this structure covers a surface area of 3.5 acres and drains a watershed area of 0.27 square miles.
Managed by the USDA NRCS, the Walling Subwatershed Sta 42+05 #4 boasts a low hazard potential and a moderate risk rating. Despite not being rated for its condition, this dam underscores the importance of proactive risk management and emergency preparedness. With its uncontrolled spillway type and remote location in Oto, this structure plays a critical role in ensuring water resource sustainability and protection for the surrounding community.
As an integral component of the local water infrastructure, the Walling Subwatershed Sta 42+05 #4 exemplifies the intersection of water resource management, climate resilience, and community safety. With its historical significance dating back to the mid-20th century, this earth dam continues to serve as a vital asset for fire protection, livestock maintenance, and flood risk mitigation. As climate change poses new challenges to water resource management, the proactive monitoring and maintenance of structures like this are essential for sustainable development and environmental stewardship in the region.
Year Completed |
1953 |
Dam Length |
300 |
Dam Height |
48 |
River Or Stream |
TR-LITTLE SIOUX RIVER |
Primary Dam Type |
Earth |
Surface Area |
3.5 |
Drainage Area |
0.27 |
Nid Storage |
109 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
48 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Little Sioux River At Correctionville
|
327cfs |
West Fork Ditch At Hornick
|
80cfs |
Maple River At Mapleton
|
323cfs |
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 42+05 #4