Sutton Bay Dam Reservoir Report
Nearby: Henry Siebrasse K. Darland
Last Updated: December 11, 2025
Sutton Bay Dam, located in Sully, South Dakota, is a privately owned structure that has been deemed state regulated and permitted for operation.
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Summary
Completed in 2002, this earth dam stands at a height of 425 feet with a hydraulic height of 37 feet, serving as a critical water resource in the region. With a maximum storage capacity of 281 acre-feet and a normal storage of 100 acre-feet, the dam plays a crucial role in managing water levels and ensuring sustainable water supply for the surrounding area.
The dam's spillway, which is uncontrolled and 60 feet wide, can handle a maximum discharge of 1250 cubic feet per second, providing a safety mechanism for excess water flow during periods of heavy rainfall or flooding. Despite being classified as having a low hazard potential, the dam's risk assessment is moderate, highlighting the importance of diligent monitoring and maintenance to prevent any potential issues. With its strategic location on the TR MISSONot RatedI RIVER, Sutton Bay Dam plays a vital role in water management and climate resilience efforts in the region, supported by state regulatory agencies and regular inspections.
As a key infrastructure element in South Dakota's water resource system, Sutton Bay Dam contributes to the overall water supply and storage capacity in the area. With its moderate risk assessment and state-regulated status, the dam serves as a symbol of responsible water management and climate adaptation in the face of changing environmental conditions. By providing a controlled release of water and ensuring proper maintenance, Sutton Bay Dam plays a crucial role in safeguarding the surrounding community and environment from potential water-related hazards and emergencies.
Year Completed |
2002 |
Dam Length |
37 |
Dam Height |
425 |
River Or Stream |
TR MISSONot RatedI RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
37 |
Nid Storage |
281 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
425 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Moreau R Near Whitehorse Sd
|
35cfs |
Bad R Near Fort Pierre Sd
|
7cfs |
Oak Cr Near Wakpala Sd
|
10cfs |
Grand R At Little Eagle Sd
|
47cfs |
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.
Sutton Bay Dam