Lum Hollow Subwatershed M-6199 Reservoir Report
Last Updated: December 14, 2025
Located in Woodbury County, Iowa, the Lum Hollow Subwatershed M-6199 is a small earth dam constructed in 1959 by the USDA NRCS for fire protection, stock, and small fish pond purposes.
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Summary
Situated on Lum Hollow Creek, this dam has a height of 39 feet and a storage capacity of 153 acre-feet. With a surface area of 5.8 acres and serving a drainage area of 0.41 square miles, the dam has a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment.
Managed by the Iowa Department of Natural Resources, Lum Hollow Subwatershed M-6199 falls under state jurisdiction and is subject to regulatory oversight, permitting, inspection, and enforcement. Despite the moderate risk level associated with the dam, it has not undergone a formal risk assessment or had an Emergency Action Plan (EAP) prepared. The dam's purpose, low hazard potential, and alignment with flood risk reduction objectives make it a crucial element in the local water resource management framework. Enthusiasts interested in water resources and climate issues will find Lum Hollow Subwatershed M-6199 to be a significant case study in dam infrastructure and regulatory practices in Iowa.
Year Completed |
1959 |
Dam Length |
200 |
Dam Height |
39 |
River Or Stream |
LUM HOLLOW CREEK |
Primary Dam Type |
Earth |
Surface Area |
5.8 |
Drainage Area |
0.41 |
Nid Storage |
153 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
39 |
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
|
14900cfs |
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-6199