Lum Hollow Subwatershed M-8552 Reservoir Report
Last Updated: December 14, 2025
Located in Woodbury County, Iowa, the Lum Hollow Subwatershed M-8552 is a small dam with a primary purpose of fire protection, stock, or small fish pond, and flood risk reduction.
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Summary
Built in 1959 by the USDA NRCS, this earth dam stands at a height of 31 feet and has a length of 450 feet, creating a storage capacity of 90 acre-feet. With a drainage area of 0.27 square miles and a surface area of 1.8 acres, the dam serves as a crucial water resource for the surrounding area.
Managed by the local government and regulated by the Iowa Department of Natural Resources, the Lum Hollow Subwatershed M-8552 is classified as having a low hazard potential and a moderate risk level. Although the condition of the dam is currently not rated, it undergoes regular inspections, permitting, and enforcement to ensure its structural integrity and safety. While the dam does not have an Emergency Action Plan in place, it meets regulatory guidelines and is equipped to handle potential emergencies effectively.
As water resource and climate enthusiasts, understanding the significance of dams like the Lum Hollow Subwatershed M-8552 is essential in managing and conserving our water resources. By recognizing the role of such structures in flood risk reduction, water storage, and environmental protection, we can work towards sustainable water management practices and resilience in the face of changing climate patterns.
Year Completed |
1959 |
Dam Length |
450 |
Dam Height |
31 |
River Or Stream |
LUM HOLLOW CREEK |
Primary Dam Type |
Earth |
Surface Area |
1.8 |
Drainage Area |
0.27 |
Nid Storage |
90 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
31 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
West Fork Ditch At Hornick
|
80cfs |
Maple River At Mapleton
|
323cfs |
Little Sioux River At Correctionville
|
327cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
Little Sioux River Near Turin
|
1040cfs |
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 M-8552