Walling Subwatershed Sta 38+00 #1b Reservoir Report
Last Updated: December 14, 2025
Walling Subwatershed Sta 38+00 #1b is a local government-owned earth dam located in Woodbury County, Iowa, designed by USDA NRCS and completed in 1953.
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Summary
This dam serves multiple purposes, including fire protection, stock watering, small fish pond management, and flood risk reduction on the TR-Little Sioux River. With a height of 32 feet and a length of 300 feet, the dam has a storage capacity of 31 acre-feet and covers a surface area of 1.6 acres.
Managed by the Iowa DNR, Walling Subwatershed Sta 38+00 #1b has a low hazard potential and a moderate risk assessment rating. While the dam is currently in a not-rated condition, it is regularly inspected, permitted, and regulated by state authorities to ensure its structural integrity and safety. The dam has an uncontrolled spillway type and is primarily constructed on soil foundations, with no associated locks or gates for water control.
Overall, Walling Subwatershed Sta 38+00 #1b plays a crucial role in water resource management and climate resilience in the region, providing essential services for both agricultural and environmental purposes. Its strategic location and design make it a key infrastructure for mitigating flood risks, protecting local communities, and supporting sustainable water use in Woodbury County, Iowa.
Year Completed |
1953 |
Dam Length |
300 |
Dam Height |
32 |
River Or Stream |
TR-LITTLE SIOUX RIVER |
Primary Dam Type |
Earth |
Surface Area |
1.6 |
Drainage Area |
0.13 |
Nid Storage |
31 |
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 38+00 #1b