Lyman Number 3 Reservoir Report
Nearby: Lyman Number 4 Lyman Number 1
Last Updated: December 7, 2025
Lyman Number 3 is a private-owned dam located in Jones, South Dakota, along the TR-BAD RIVER.
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Summary
Built in 1958, this earth dam stands at a height of 35 feet and has a storage capacity of 67 acre-feet. With a maximum discharge of 945 cubic feet per second, this dam serves the primary purpose of water resource management in the area.
Managed by the Natural Resources Conservation Service, Lyman Number 3 is regulated by the South Dakota Department of Environment and Natural Resources. Despite being rated as having low hazard potential and not yet having a condition assessment, the dam is subject to regular state inspections, enforcement, and permitting to ensure its safety and compliance with regulations. The dam plays a critical role in managing water resources in the region and contributes to the overall climate resilience of the area.
While the dam has not been modified in recent years and lacks certain emergency preparedness measures such as an Emergency Action Plan (EAP), it remains a key infrastructure for water management in South Dakota. With Dusty Johnson (R) as the Congressional representative for the area, continued monitoring and maintenance of Lyman Number 3 will be crucial to ensuring its long-term effectiveness in water resource management and climate adaptation efforts.
Year Completed |
1958 |
Dam Length |
219 |
Dam Height |
35 |
River Or Stream |
TR-BAD RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
35 |
Nid Storage |
67 |
Hazard Potential |
Low |
Nid Height |
35 |
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.
Lyman Number 3