Stephen Mission Reservoir Report
Nearby: K Lazy K Dam T. Jennings
Last Updated: December 13, 2025
Stephen Mission, also known as Lake Boehm, is a recreational earth dam located in Hyde, South Dakota.
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Summary
Owned by the Tribal Government, the dam was completed in 1939 and stands at a height of 34 feet with a length of 875 feet. The primary purpose of Stephen Mission is for recreation, with additional purposes including fire protection, stock, and small fish pond.
Situated on the WEST FORK ELM CREEK, Stephen Mission has a low hazard potential and has not been rated for its condition assessment. With a normal storage capacity of 756 acre-feet and a maximum discharge of 2000 cubic feet per second, the dam provides important water resource management for the surrounding area. Despite not being regulated by the state, Stephen Mission offers a peaceful retreat for water resource and climate enthusiasts seeking outdoor activities in South Dakota.
With its historical significance and picturesque surroundings, Stephen Mission serves as a valuable asset for the community while offering opportunities for recreation and water conservation. As an earth dam with a rich history dating back to the late 1930s, this site is not only a scenic destination but also plays a role in providing essential water resources for the region. For those interested in exploring the intersection of water resource management and climate resilience, Stephen Mission offers a unique perspective and a chance to connect with nature in a meaningful way.
Year Completed |
1939 |
Dam Length |
875 |
Dam Height |
34 |
River Or Stream |
WEST FORK ELM CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
34 |
Nid Storage |
1360 |
Structural Height |
34 |
Hazard Potential |
Low |
Nid Height |
34 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
White R Near Oacoma Sd
|
105cfs |
Bad R Near Fort Pierre Sd
|
7cfs |
James R At Huron Sd
|
548cfs |
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.
Stephen Mission