Lum Hollow Subwatershed M-27785 Reservoir Report
Last Updated: December 14, 2025
Lum Hollow Subwatershed M-27785 is a vital water resource managed by local government authorities in Woodbury County, Iowa.
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Summary
Designed by the USDA NRCS and regulated by the Iowa DNR, this earth dam serves multiple purposes including fire protection, stock, small fish pond maintenance, and flood risk reduction. Completed in 1959, the dam stands at a height of 38 feet, with a storage capacity of 341 acre-feet and a drainage area of 0.74 square miles.
The dam's low hazard potential and moderate risk assessment make it a key component of the local water management infrastructure. While the condition assessment is currently not rated, regular inspections and enforcement by state agencies ensure its continued safety and functionality. Lum Hollow Subwatershed M-27785 plays a crucial role in protecting the surrounding area from potential flooding and supporting various water-related activities in the region.
With its location along Lum Hollow Creek and close proximity to Turin, this dam embodies the intersection of human and natural elements in water resource management. As climate change poses new challenges to water security, understanding and maintaining structures like Lum Hollow Subwatershed M-27785 is essential for sustainable water management in the region.
Year Completed |
1959 |
Dam Length |
800 |
Dam Height |
38 |
River Or Stream |
LUM HOLLOW CREEK |
Primary Dam Type |
Earth |
Surface Area |
11 |
Drainage Area |
0.74 |
Nid Storage |
341 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
38 |
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
|
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-27785