Anderson No.1 Reservoir Report
Nearby: Anderson #2 Vesely No.1
Last Updated: December 13, 2025
Anderson No.1 is a private dam located in Mellette, South Dakota, with a low hazard potential and a height of 27 feet.
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Summary
Constructed in 1956, this earth dam has a storage capacity of 22 acre-feet and a maximum discharge of 187 cubic feet per second. The dam is regulated by the South Dakota Department of Environment and Natural Resources (DENR) and undergoes regular inspections, permitting, and enforcement to ensure its safety and compliance with state regulations.
Situated on the TR Big White Offstream river, Anderson No.1 serves as a vital water resource in the region, providing storage for irrigation, water supply, and flood control purposes. Owned privately, this dam plays a crucial role in managing water resources in the area and supporting agricultural activities. While it is currently rated as "Not Rated" in terms of condition assessment, the dam's emergency action plan status, risk assessment, and risk management measures are yet to be determined and updated.
With Congressman Dusty Johnson representing the area in South Dakota, Anderson No.1 serves as a significant infrastructure contributing to the water management and climate resilience efforts in the region. As a key component of the state's water resource infrastructure, this dam plays a crucial role in supporting the local community and ensuring the sustainable use of water resources for future generations. The ongoing maintenance and monitoring of Anderson No.1 exemplify the commitment to safeguarding water resources and addressing climate challenges in the area.
Year Completed |
1956 |
Dam Length |
351 |
Dam Height |
27 |
River Or Stream |
TR BIG WHITE OFFSTREAM |
Primary Dam Type |
Earth |
Hydraulic Height |
27 |
Nid Storage |
22 |
Hazard Potential |
Low |
Nid Height |
27 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
White River Near White River
|
42cfs |
Little White R Below White River Sd
|
141cfs |
Little White R Near Rosebud Sd
|
96cfs |
White R Near Oacoma Sd
|
105cfs |
Keya Paha R Near Keyapaha Sd
|
33cfs |
Bad R Near Fort Pierre Sd
|
7cfs |
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.
Anderson No.1