Sandy Number 1 Reservoir Report
Nearby: Sandy Number 2 Brost Number 7
Last Updated: December 7, 2025
Sandy Number 1 is a privately owned dam located in Jones, South Dakota, along the TR-White River.
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Summary
Constructed in 1969 by the Natural Resources Conservation Service, this earth dam stands at a height of 27 feet and stretches 510 feet in length. With a storage capacity of 38 acre-feet, the dam serves primarily for flood control purposes with a low hazard potential.
Although the dam is regulated by the South Dakota Department of Environment and Natural Resources and undergoes regular inspections, its condition assessment is currently listed as "Not Rated." Despite this, Sandy Number 1 has not been designated as high risk and lacks detailed emergency action preparedness measures. The surrounding area, including the downstream community, may benefit from updated risk assessment and enhanced emergency response guidelines to ensure the safety and resilience of the structure in the face of changing climate conditions.
Water resource and climate enthusiasts monitoring Sandy Number 1 should take note of its location within the St. Paul District of the US Army Corps of Engineers and the involvement of federal agencies in its construction and oversight. As efforts to address climate change intensify, the importance of maintaining and improving infrastructure like Sandy Number 1 becomes increasingly crucial to safeguarding communities and ecosystems against extreme weather events and water resource challenges.
Year Completed |
1969 |
Dam Length |
510 |
Dam Height |
27 |
River Or Stream |
TR-WHITE RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
27 |
Nid Storage |
38 |
Hazard Potential |
Low |
Nid Height |
27 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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.
Sandy Number 1