Lee Anderson Reservoir Report
Nearby: Brakke Dam Byre Dam
Last Updated: December 13, 2025
Located in Lyman, South Dakota, the Lee Anderson dam stands as a testament to water resource management, with a height of 27 feet and a length of 370 feet.
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Summary
Completed in 1960, this earth dam serves to control the flow of the TR-MISSONot RatedI river or stream, with a maximum discharge capacity of 340 cubic feet per second. Owned privately, the dam is regulated by the South Dakota Department of Environment and Natural Resources, ensuring that it meets state permitting, inspection, and enforcement standards.
Managed by the Natural Resources Conservation Service, Lee Anderson dam has a low hazard potential and a condition assessment of "Not Rated." With a storage capacity of 16 acre-feet, the dam plays a crucial role in water storage and flood control in the area. Despite its age, the dam has not undergone any modifications in recent years, highlighting its sturdy construction and efficient operation. As climate change continues to impact water resources, dams like Lee Anderson will be vital in ensuring water security for communities in South Dakota.
The Lee Anderson dam serves as a vital infrastructure for water management in South Dakota, providing critical flood control and water storage capabilities. With its low hazard potential and state-regulated status, the dam is a reliable asset in the face of changing climate patterns. As water resource enthusiasts continue to advocate for sustainable water management practices, the Lee Anderson dam stands as a model for effective dam operation and maintenance in the region.
Year Completed |
1960 |
Dam Length |
370 |
Dam Height |
27 |
River Or Stream |
TR-MISSONot RatedI |
Primary Dam Type |
Earth |
Hydraulic Height |
27 |
Nid Storage |
16 |
Hazard Potential |
Low |
Nid Height |
27 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
White R Near Oacoma Sd
|
105cfs |
Bad R Near Fort Pierre Sd
|
7cfs |
White River Near White River
|
42cfs |
Little White R Below White River Sd
|
141cfs |
Keya Paha R Near Keyapaha Sd
|
33cfs |
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.
Lee Anderson