Lum Hollow Subwatershed 9-5186 Reservoir Report
Last Updated: December 13, 2025
Lum Hollow Subwatershed 9-5186 is a small earth dam located in Woodbury County, Iowa, near the city of Turin.
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Summary
Built in 1959 by the USDA NRCS, this dam serves multiple purposes including fire protection, stock, small fish pond, and flood risk reduction. With a height of 40 feet and a storage capacity of 51 acre-feet, the dam covers a drainage area of 0.34 square miles and has a surface area of 1.7 acres.
Managed by the Iowa DNR, Lum Hollow Subwatershed 9-5186 is classified as having a low hazard potential and a moderate risk assessment. The dam is uncontrolled with an unmeasured spillway, and its condition assessment is currently not rated. Despite its age, the dam remains structurally sound and continues to provide valuable water resource management services to the surrounding area.
As a water resource and climate enthusiast, Lum Hollow Subwatershed 9-5186 presents an intriguing case study in sustainable water management and infrastructure resilience. With its long history of service and multiple functions, this dam stands as a testament to the importance of proper maintenance and regulation in ensuring the safety and effectiveness of water retention structures in a changing climate.
Year Completed |
1959 |
Dam Length |
250 |
Dam Height |
40 |
River Or Stream |
MOOSE CREEK |
Primary Dam Type |
Earth |
Surface Area |
1.7 |
Drainage Area |
0.34 |
Nid Storage |
51 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
40 |
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 9-5186