Lum Hollow Subwatershed M-22453 Reservoir Report
Last Updated: December 14, 2025
Located in Woodbury County, Iowa, the Lum Hollow Subwatershed M-22453 is a vital water resource managed by the local government.
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Summary
This earth dam, completed in 1959 by the USDA NRCS, serves multiple purposes including fire protection, stock management, and flood risk reduction. With a height of 44 feet and a storage capacity of 214 acre-feet, this dam covers a drainage area of 1.19 square miles and has a surface area of 6.3 acres.
Managed by the Iowa DNR, this dam is regulated, permitted, inspected, and enforced by state agencies to ensure its safety and efficacy. With a low hazard potential and a moderate risk assessment rating, the Lum Hollow Subwatershed dam plays a crucial role in water management in the region. While it currently holds a "Not Rated" condition assessment, regular inspections and risk management measures are in place to maintain its functionality and safety for the surrounding community.
In case of emergencies, the dam's Emergency Action Plan (EAP) status is not provided, but it is important to note that the risk management measures are in place to mitigate any potential hazards. With its strategic location on Lum Hollow Creek and its significant contribution to flood risk reduction, this dam is a key component of the water resource infrastructure in the area, highlighting the importance of proper management and maintenance to ensure its long-term functionality and safety for the community.
Year Completed |
1959 |
Dam Length |
300 |
Dam Height |
44 |
River Or Stream |
LUM HOLLOW CREEK |
Primary Dam Type |
Earth |
Surface Area |
6.3 |
Drainage Area |
1.19 |
Nid Storage |
214 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
44 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
West Fork Ditch At Hornick
|
80cfs |
Maple River At Mapleton
|
323cfs |
Little Sioux River At Correctionville
|
327cfs |
Missouri River At Decatur
|
14900cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
Little Sioux River Near Turin
|
1040cfs |
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-22453