Walling Subwatershed Sta 23+00 #1h Reservoir Report
Last Updated: December 13, 2025
The Walling Subwatershed Sta 23+00 #1h is a low-hazard earth dam located in Woodbury County, Iowa, near the city of OTO.
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Summary
Built in 1953 by the USDA NRCS, this dam serves multiple purposes including fire protection, stock watering, and small fish pond management. With a height of 32 feet and a length of 250 feet, the dam has a storage capacity of 19 acre-feet and covers a surface area of 1 acre.
Managed by the Iowa Department of Natural Resources, this dam is regulated, permitted, inspected, and enforced by the state agency to ensure its safety and compliance with regulations. The dam's primary purpose of flood risk reduction adds to its importance in the region, as it helps protect the surrounding area from potential flooding events. Despite its moderate risk assessment, the Walling Subwatershed Sta 23+00 #1h is deemed to have a low hazard potential and has not been rated for its condition as of yet.
Overall, the Walling Subwatershed Sta 23+00 #1h is a crucial infrastructure for water resource management in the area, providing essential services while also mitigating flood risks. Its construction and maintenance are overseen by the USDA NRCS and the Iowa DNR, highlighting the collaborative efforts of federal and state agencies in safeguarding water resources and climate resilience in the region.
Year Completed |
1953 |
Dam Length |
250 |
Dam Height |
32 |
River Or Stream |
TR-LITTLE SIOUX RIVER |
Primary Dam Type |
Earth |
Surface Area |
1 |
Drainage Area |
0.09 |
Nid Storage |
19 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
32 |
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 23+00 #1h