Walling Subwatershed Sta 78+96 #1b Reservoir Report
Last Updated: December 14, 2025
Walling Subwatershed Sta 78+96 #1b is a vital earth dam located in Woodbury County, Iowa, with a primary purpose of fire protection, stock, or small fish pond, as well as flood risk reduction.
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Summary
Completed in 1953 by the USDA NRCS, this dam stands at 32 feet in height and spans 500 feet in length, with a storage capacity of 33 acre-feet. It serves as an essential resource for the local community in OTO, offering a surface area of 3.3 acres and a drainage area of 0.11 square miles.
Managed by the Iowa DNR, Walling Subwatershed Sta 78+96 #1b has a low hazard potential and a moderate risk assessment rating of 3. While the dam is currently in a not rated condition, it is subject to state regulation, permitting, inspection, and enforcement to ensure public safety and environmental protection. The Little Sioux River serves as the primary water source for this structure, highlighting its significance in managing water resources and mitigating flood risks in the region.
Overall, Walling Subwatershed Sta 78+96 #1b plays a crucial role in water resource management and climate resilience efforts in Woodbury County, Iowa. With its strategic design and construction by the USDA NRCS, this earth dam serves multiple purposes while also addressing the potential hazards and risks associated with its operation. As a key infrastructure asset, it underscores the importance of proactive monitoring, maintenance, and regulatory oversight in safeguarding the local community and ecosystem from potential water-related challenges.
Year Completed |
1953 |
Dam Length |
500 |
Dam Height |
32 |
River Or Stream |
TR-LITTLE SIOUX RIVER |
Primary Dam Type |
Earth |
Surface Area |
3.3 |
Drainage Area |
0.11 |
Nid Storage |
33 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
32 |
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 78+96 #1b