Anderson #2 Reservoir Report
Nearby: Anderson No.1 Vesely No.2
Last Updated: December 13, 2025
Anderson #2 is a privately owned dam located in Mellette, South Dakota, along the TR Big White Offstream.
°F
°F
mph
Wind
%
Humidity
Summary
Built in 1957, this earth dam stands at 28 feet tall and spans 378 feet in length, with a storage capacity of 31 acre-feet. The dam is under state jurisdiction and regulation by the South Dakota Department of Environment and Natural Resources (DENR), with permitting, inspection, and enforcement processes in place to ensure its safety and compliance.
Despite being classified as having a low hazard potential, Anderson #2 has not been rated for its condition assessment. Emergency action plans and risk management measures have not been documented, indicating a potential area for improvement in terms of preparedness and safety protocols. The dam is not under the ownership or funding of any federal agency, with its operations solely managed by the private entity responsible for its maintenance and upkeep.
As an essential structure for water resource management in the region, Anderson #2 serves as a point of interest for climate and water resource enthusiasts. Its location, design, and regulatory oversight provide valuable insights into the role of private dams in maintaining water security and infrastructure resilience in South Dakota.
Year Completed |
1957 |
Dam Length |
378 |
Dam Height |
28 |
River Or Stream |
TR BIG WHITE OFFSTREAM |
Primary Dam Type |
Earth |
Hydraulic Height |
28 |
Nid Storage |
31 |
Hazard Potential |
Low |
Nid Height |
28 |
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.
Anderson #2