Largis Dam Reservoir Report
Nearby: Jacobi Dam Nygaard Duckpond
Last Updated: December 6, 2025
Largis Dam, located in Harding, South Dakota, along the TRIB-S FORK GRAND RIVER, was completed in 1947 and is privately owned.
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Summary
The dam stands at a height of 17 feet with a length of 460 feet, providing a storage capacity of 88 acre-feet. While the primary purpose of the dam is not specified, it serves as a crucial water resource management structure in the region.
Managed by the South Dakota Department of Environment and Natural Resources (DENR), Largis Dam is regulated, permitted, inspected, and enforced by state authorities. With a low hazard potential and a current condition assessment of "Not Rated," the dam is considered to be in satisfactory condition. However, details regarding emergency action plans, risk assessments, and management measures are not readily available, indicating a potential area for further improvement in the dam's operational safety protocols.
Despite lacking certain key information, such as spillway type and outlet gates, Largis Dam remains a vital component of the local water infrastructure. As climate change continues to impact water resources, the proper maintenance and upkeep of dams like Largis are essential for ensuring the safety and sustainability of water supplies for both human and environmental needs in the region.
Year Completed |
1947 |
Dam Length |
460 |
Dam Height |
17 |
River Or Stream |
TRIB-S FORK GRAND RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
17 |
Nid Storage |
88 |
Hazard Potential |
Low |
Nid Height |
17 |
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.
Largis Dam