Tubbs Moss Agate Dam Reservoir Report
Nearby: Porter Moss Agate Dam Double Dam
Last Updated: December 6, 2025
Tubbs Moss Agate Dam, located in Fall River, South Dakota, is a privately owned earth dam that was completed in 1947.
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Summary
This dam, standing at a height of 36 feet and with a length of 750 feet, serves as a vital structure in managing water resources in the area. Situated on a tributary of the Cheyenne River, the dam has a maximum storage capacity of 396 acre-feet and a normal storage capacity of 65 acre-feet, contributing to the overall water management efforts in the region.
Managed by the Natural Resources Conservation Service, Tubbs Moss Agate Dam is regulated by the South Dakota Department of Environment and Natural Resources, with regular inspections and enforcement measures in place to ensure its safety and functionality. Despite being classified as having a low hazard potential and not yet rated for its condition, the dam plays a crucial role in flood control and water supply for the surrounding communities. With a maximum discharge capacity of 2400 cubic feet per second, the dam is equipped to handle varying water levels and maintain the integrity of its structure.
As an essential component of the water infrastructure in South Dakota, Tubbs Moss Agate Dam represents a harmonious blend of environmental conservation and resource management. With its strategic location, reliable design, and efficient operations, the dam stands as a testament to the collaborative efforts of private ownership, government oversight, and community engagement in safeguarding water resources and adapting to the challenges of climate variability.
Year Completed |
1947 |
Dam Length |
750 |
Dam Height |
36 |
River Or Stream |
TRIBUTARY OF CHEYENNE RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
36 |
Nid Storage |
396 |
Hazard Potential |
Low |
Nid Height |
36 |
Seasonal Comparison
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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.
Tubbs Moss Agate Dam