Lum Hollow Subwatershed M-17850 Reservoir Report
Last Updated: December 14, 2025
Lum Hollow Subwatershed M-17850 is a dam located in Woodbury, Iowa, specifically in the city of Turin, along the Lum Hollow Creek.
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Summary
This earth dam was completed in 1959 and serves multiple purposes including fire protection, stock, small fish pond, and flood risk reduction. With a dam height of 36 feet and a storage capacity of 89 acre-feet, the structure covers a surface area of 1.7 acres and drains a 0.53 square mile watershed.
Managed by the local government and designed by the USDA NRCS, Lum Hollow Subwatershed M-17850 is regulated by the Iowa DNR. The dam has a low hazard potential and a moderate risk assessment rating. While it has not been inspected or assessed for conditions recently, it is considered to meet safety guidelines. The surrounding area, including the spillway, has not been modified in recent years, suggesting a stable infrastructure that continues to provide valuable water resource management and protection to the community.
Overall, Lum Hollow Subwatershed M-17850 stands as a critical piece of water infrastructure in the region, contributing to flood risk reduction and providing essential services to the local community. With its long history and stable condition, this dam serves as an important example of effective water resource management and climate resilience in Woodbury County, Iowa.
Year Completed |
1959 |
Dam Length |
300 |
Dam Height |
36 |
River Or Stream |
LUM HOLLOW CREEK |
Primary Dam Type |
Earth |
Surface Area |
1.7 |
Drainage Area |
0.53 |
Nid Storage |
89 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
36 |
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-17850