Walling Subwatershed Sta 55+40 #1 Reservoir Report
Last Updated: December 13, 2025
Located in Woodbury County, Iowa, the Walling Subwatershed Sta 55+40 #1 is a vital water resource infrastructure designed by the USDA NRCS in 1953.
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Summary
This earth dam stands at a height of 50 feet and has a length of 400 feet, providing flood risk reduction and water storage for fire protection, stocking, and small fish pond purposes. Situated along the TR-Little Sioux River, this dam has a drainage area of 0.23 square miles and a storage capacity of 87 acre-feet.
Managed by the Iowa DNR, this dam has a low hazard potential and a moderate risk assessment score of 3. While the condition assessment is not rated, the dam is regularly inspected, permitted, and regulated by the state. With a surface area of 4 acres and a normal storage capacity of 51 acre-feet, the Walling Subwatershed Sta 55+40 #1 plays a crucial role in managing water resources and mitigating flood risks in the area.
Overall, this earth dam serves as a key infrastructure for water management and climate resilience in the region. With its strategic location and purposeful design, the Walling Subwatershed Sta 55+40 #1 contributes to the overall water security and environmental sustainability efforts in Woodbury County, Iowa.
Year Completed |
1953 |
Dam Length |
400 |
Dam Height |
50 |
River Or Stream |
TR-LITTLE SIOUX RIVER |
Primary Dam Type |
Earth |
Surface Area |
4 |
Drainage Area |
0.23 |
Nid Storage |
87 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
50 |
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 55+40 #1