Smokey Hollow Subwatershed Site 3 Reservoir Report
Last Updated: December 14, 2025
Smokey Hollow Subwatershed Site 3, located in Smithland, Iowa, is a critical flood risk reduction structure managed by the local government.
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Summary
This Earth-type dam, completed in 1986, stands at a height of 58 feet and spans 472 feet in length, providing a storage capacity of 258 acre-feet to help mitigate flooding in the area. With a drainage area of 0.51 square miles and a surface area of 2.6 acres, this dam plays a crucial role in safeguarding the surrounding community from potential hazards.
Managed by the Iowa Department of Natural Resources, Smokey Hollow Subwatershed Site 3 is subject to regular inspections and enforcement measures to ensure its structural integrity and functionality. Despite being categorized as having a high hazard potential, the dam has been assessed as satisfactory in condition, with a moderate risk assessment. The local government's commitment to maintaining and managing this structure underscores its importance in protecting the environment and communities downstream from potential flooding events. Water resource and climate enthusiasts will find Smokey Hollow Subwatershed Site 3 to be a fascinating example of effective flood risk reduction infrastructure in action.
Year Completed |
1986 |
Dam Length |
472 |
Dam Height |
58 |
River Or Stream |
TR-SMOKEY HOLLOW |
Primary Dam Type |
Earth |
Surface Area |
2.6 |
Drainage Area |
0.51 |
Nid Storage |
258 |
Hazard Potential |
High |
Foundations |
Soil |
Nid Height |
58 |
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
|
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.
Smokey Hollow Subwatershed Site 3