Woods Hollow Subwatershed Site M-10450 Reservoir Report
Last Updated: December 14, 2025
Woods Hollow Subwatershed Site M-10450 is a dam located in Monona, Iowa, specifically in the city of Little Sioux.
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Summary
The dam, constructed in 1960 by the USDA NRCS, serves multiple purposes including fire protection, stock, small fish pond, and flood risk reduction. With a height of 25 feet and a storage capacity of 50 acre-feet, this earth dam plays a crucial role in managing water resources in the area.
The dam is regulated by the Iowa DNR and is regularly inspected to ensure its safety and effectiveness. With a low hazard potential and a moderate risk assessment rating, the Woods Hollow Subwatershed Site M-10450 is a vital infrastructure for the local community. Despite not being rated for its condition assessment, the dam continues to serve its purpose in water management and conservation efforts in the region.
Located along the TR- Little Sioux River, this dam contributes to the overall health of the watershed by providing flood risk reduction and water storage capabilities. With its strategic location and design, the Woods Hollow Subwatershed Site M-10450 is an important site for water resource and climate enthusiasts to study and appreciate in the context of sustainable water management practices.
Year Completed |
1960 |
Dam Height |
25 |
River Or Stream |
TR- LITTLE SIOUX RIVER |
Primary Dam Type |
Earth |
Surface Area |
2 |
Drainage Area |
1.7 |
Nid Storage |
50 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
25 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Little Sioux River Near Turin
|
1040cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
Soldier River At Pisgah
|
112cfs |
Maple River At Mapleton
|
323cfs |
Missouri River At Decatur
|
14900cfs |
West Fork Ditch At Hornick
|
80cfs |
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.
Woods Hollow Subwatershed Site M-10450