Walling Subwatershed Sta 18+02 #5 Reservoir Report
Last Updated: December 14, 2025
Walling Subwatershed Sta 18+02 #5 is a dam located in Woodbury County, Iowa, specifically in the city of OTO.
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Summary
Built in 1953 by the USDA SCS, this earth dam serves multiple purposes including fire protection, stock, small fish pond, and flood risk reduction. With a height of 35 feet and a storage capacity of 16 acre-feet, this dam plays a crucial role in managing water resources in the area.
Managed by the Iowa Department of Natural Resources (IOWA DNR), Walling Subwatershed Sta 18+02 #5 is regulated, permitted, inspected, and enforced by the state. The dam has a low hazard potential and a moderate risk assessment score of 3, indicating a need for ongoing monitoring and management. The surrounding area has a drainage area of 0.04 square miles and a surface area of 1.5 acres, making it an important feature for water management in the region.
While the dam has not been rated for its condition, it is essential for maintaining water levels and protecting against potential flooding events in the Little Sioux River watershed. With its controlled spillway and earth dam structure, Walling Subwatershed Sta 18+02 #5 represents a vital piece of infrastructure for both water resource management and climate resilience efforts in Woodbury County, Iowa.
Year Completed |
1953 |
Dam Length |
100 |
Dam Height |
35 |
River Or Stream |
TR-LITTLE SIOUX RIVER |
Primary Dam Type |
Earth |
Surface Area |
1.5 |
Drainage Area |
0.04 |
Nid Storage |
16 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
35 |
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 18+02 #5