Lum Hollow Subwatershed M-13210 Reservoir Report
Last Updated: December 14, 2025
Lum Hollow Subwatershed M-13210 is a small earth dam located in Woodbury County, Iowa, near the Missouri River.
°F
°F
mph
Wind
%
Humidity
Summary
Built in 1959 by the USDA NRCS, this dam serves multiple purposes including fire protection, stock watering, and small fish pond management. With a dam height of 26 feet and a storage capacity of 68 acre-feet, this structure plays a significant role in flood risk reduction within the Lum Hollow Creek watershed.
Despite its relatively low hazard potential, Lum Hollow Subwatershed M-13210 is regulated by the Iowa DNR and undergoes regular state inspections to ensure its structural integrity and functionality. The dam has a drainage area of 3.35 square miles and a surface area of 2.5 acres, making it an essential component of the local water resource management system. While the dam's condition assessment is currently listed as "not rated," its risk assessment indicates a moderate level of risk, highlighting the importance of ongoing monitoring and maintenance efforts.
Overall, Lum Hollow Subwatershed M-13210 serves as a vital water management structure in the region, providing essential services for both agricultural and environmental purposes. With its connection to the Lum Hollow Creek and proximity to the Missouri River, this dam plays a crucial role in mitigating flood risks and supporting the overall health of the local ecosystem. As climate change continues to impact water resources, structures like Lum Hollow Subwatershed M-13210 will play an increasingly important role in sustainable water management practices.
Year Completed |
1959 |
Dam Length |
300 |
Dam Height |
26 |
River Or Stream |
LUM HOLLOW CREEK |
Primary Dam Type |
Earth |
Surface Area |
2.5 |
Drainage Area |
3.35 |
Nid Storage |
68 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
26 |
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-13210