Lum Hollow Subwatershed 9-10651 Reservoir Report
Last Updated: December 13, 2025
Lum Hollow Subwatershed 9-10651 is a vital water resource located in Woodbury, Iowa, specifically in the city of Missouri River.
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Summary
This earth dam structure was completed in 1959 and serves multiple purposes, including fire protection, stock watering, small fish pond management, and flood risk reduction. With a dam height of 25 feet and a storage capacity of 87 acre-feet, this structure covers a surface area of 1.8 acres and drains an area of 2.37 square miles.
Managed by the local government and designed by the USDA NRCS, Lum Hollow Subwatershed 9-10651 is regulated by the Iowa DNR and undergoes regular inspections to ensure its safety and functionality. Despite its low hazard potential, the dam's risk assessment is moderate, indicating the need for continued monitoring and risk management measures. With a spillway type of 'Uncontrolled' and a maximum discharge of 0 cubic feet per second, this structure plays a crucial role in water resource management and protection in the region.
Overall, Lum Hollow Subwatershed 9-10651 stands as a significant infrastructure for water resource and climate enthusiasts, contributing to the conservation of water, wildlife, and land in Woodbury, Iowa. Its construction reflects a commitment to sustainable water management practices and serves as a key component in the local ecosystem's resilience to flooding and other natural hazards. As efforts to address climate change and water scarcity intensify, structures like this earth dam will continue to play a crucial role in safeguarding the environment and ensuring the well-being of communities in the region.
Year Completed |
1959 |
Dam Length |
300 |
Dam Height |
25 |
River Or Stream |
TR-LUM HOLLOW |
Primary Dam Type |
Earth |
Surface Area |
1.8 |
Drainage Area |
2.37 |
Nid Storage |
87 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
25 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
West Fork Ditch At Hornick
|
80cfs |
Maple River At Mapleton
|
323cfs |
Little Sioux River At Correctionville
|
327cfs |
Little Sioux River Near Turin
|
1040cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
Missouri River At Decatur
|
15500cfs |
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.
Lum Hollow Subwatershed 9-10651