T. Mason Reservoir Report
Nearby: N. Overdahl G. Boke No.2
Last Updated: December 13, 2025
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Summary
Mason is a privately owned earth dam located in Meade, South Dakota, along the TR CHEYENNE river. Completed in 1962, this dam stands at a height of 13 feet and has a storage capacity of 78 acre-feet. Despite its low hazard potential and the absence of a condition assessment rating, T. Mason is subject to state regulation, permitting, inspection, and enforcement by the South Dakota Department of Environment and Natural Resources (DENR).
Managed by the Natural Resources Conservation Service, T. Mason plays a crucial role in water resource management within the region. With a maximum discharge capacity of 4400 cubic feet per second, this dam serves to control and regulate water flow, protect downstream areas from flooding, and provide water storage for various purposes. Additionally, T. Mason contributes to the overall environmental sustainability and climate resilience of the surrounding ecosystem.
Although T. Mason has not been rated for its current condition, its presence ensures a level of protection and control over water resources in the area. As an essential piece of infrastructure in the St. Paul District, this dam underscores the importance of proper maintenance, inspection, and regulatory oversight to safeguard the local community and environment from potential hazards and ensure the continued availability of water resources for future generations.
Year Completed |
1962 |
Dam Length |
480 |
Dam Height |
13 |
River Or Stream |
TR CHEYENNE |
Primary Dam Type |
Earth |
Hydraulic Height |
13 |
Nid Storage |
78 |
Hazard Potential |
Low |
Nid Height |
13 |
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.
T. Mason