Stephany Dam Reservoir Report
Last Updated: December 13, 2025
Stephany Dam, located in Woodbine, Iowa, serves multiple purposes including fire protection, stock, and small fish pond.
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Summary
Built in 1945, this private earth dam stands at 26 feet high and spans 250 feet in length, with a storage capacity of 191 acre-feet. Situated on the TR-Boyer River, this dam is regulated by the Iowa Department of Natural Resources and is subject to state permitting, inspection, and enforcement to ensure its safety and compliance with regulations.
The dam's low hazard potential and moderate risk assessment reflect its overall stable condition and the measures in place to manage any potential risks. While the dam's last inspection dates back to 1979, its risk management strategies and emergency action plans have not been rated or updated in recent years. Despite these gaps in assessment and preparedness, Stephany Dam continues to provide essential functions for the local community while being closely monitored for any necessary maintenance or improvements.
Although the dam has not undergone recent evaluations, its historical significance and vital role in water resource management warrant continued attention and oversight to ensure its continued safety and efficiency. With a focus on fire protection, livestock support, and recreational fishing opportunities, Stephany Dam remains an integral part of the environmental and agricultural landscape in Harrison County, Iowa.
Year Completed |
1945 |
Dam Length |
250 |
Dam Height |
26 |
River Or Stream |
TR-BOYER RIVER |
Primary Dam Type |
Earth |
Surface Area |
10 |
Drainage Area |
3.34 |
Nid Storage |
191 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
26 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Boyer River At Logan
|
417cfs |
Soldier River At Pisgah
|
112cfs |
Little Sioux River Near Turin
|
1040cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
Maple River At Mapleton
|
323cfs |
West Nishnabotna River At Hancock
|
154cfs |
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.
Stephany Dam