Lum Hollow Subwatershed 12-10865 Reservoir Report
Last Updated: December 14, 2025
Lum Hollow Subwatershed 12-10865 is a significant water resource in Woodbury, Iowa, owned by the local government and designed by USDA NRCS.
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Summary
This dam, completed in 1959, serves multiple purposes including fire protection, stock, small fish pond, and flood risk reduction. With a height of 27 feet and a storage capacity of 119 acre-feet, it covers a drainage area of 0.41 square miles and has a surface area of 13 acres along TR-Lum Hollow Creek.
Managed by the Iowa DNR, this dam has a low hazard potential and is currently rated as "Not Rated" in terms of its condition assessment. The risk assessment for Lum Hollow Subwatershed 12-10865 is moderate, indicating a level 3 risk. Despite lacking specific details on emergency action planning and inundation maps, this dam plays a crucial role in water resource management in the area. Its location in the Turin city vicinity adds to its importance in maintaining water quality and mitigating flood risks in the region.
Overall, Lum Hollow Subwatershed 12-10865 stands as a key infrastructure for water resource management in Woodbury, Iowa. With its earth dam structure and multiple purposes, it contributes to fire protection, stock maintenance, and flood risk reduction. As a regulated entity under the supervision of the Iowa DNR, this dam is essential for maintaining water quality and ensuring public safety, despite having some moderate risks associated with its operation.
Year Completed |
1959 |
Dam Length |
350 |
Dam Height |
27 |
River Or Stream |
TR-LUM HOLLOW CREEK |
Primary Dam Type |
Earth |
Surface Area |
13 |
Drainage Area |
0.41 |
Nid Storage |
119 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
27 |
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 12-10865