Sully 2 Reservoir Report
Nearby: Paulsen South Okreek
Last Updated: December 13, 2025
Sully 2, located in South Dakota, is a Federal-owned structure managed by the Bureau of Indian Affairs.
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Summary
Built in 1935, this Earth dam stands at a structural height of 24 feet and has a length of 496 feet, serving primarily as a Fish and Wildlife Pond. With a maximum storage capacity of 200 acre-feet, Sully 2 plays a crucial role in fire protection, stock maintenance, recreational activities, and supporting local wildlife.
Despite being classified as having a high hazard potential, the condition assessment of Sully 2 is currently not available. The last inspection took place in August 2012, with a scheduled inspection frequency of every 5 years. The Emergency Action Plan (EAP) status and risk assessment for the dam are also not specified, indicating potential areas for improvement in ensuring the safety and stability of the structure in case of emergencies.
With its picturesque location along Oak Creek, Sully 2 stands as a testament to the historical significance of water resource management in the region. As climate change continues to impact water availability and quality, the role of dams like Sully 2 in maintaining ecological balance and providing essential services to the community becomes increasingly vital. As enthusiasts in water resources and climate, understanding and monitoring the condition of structures like Sully 2 is crucial for sustainable water management practices in the face of changing environmental conditions.
Year Completed |
1935 |
Dam Length |
496 |
River Or Stream |
OAK CREEK -TR |
Primary Dam Type |
Earth |
Nid Storage |
200 |
Structural Height |
24 |
Hazard Potential |
High |
Nid Height |
24 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Keya Paha R Near Keyapaha Sd
|
33cfs |
Little White R Below White River Sd
|
141cfs |
Little White R Near Rosebud Sd
|
96cfs |
White River Near White River
|
42cfs |
Niobrara River Near Sparks
|
969cfs |
Keya Paha R At Wewela Sd
|
54cfs |
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.
Sully 2