Viet No.1 Reservoir Report
Nearby: V. Miller No.2 V. Miller No.1
Last Updated: December 6, 2025
Viet No.1 is a privately owned dam located in Ziebach, South Dakota, along the TR MOREAU river.
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Summary
Built in 1962, this earth dam stands at a height of 30 feet, with a length of 1280 feet and a storage capacity of 396 acre-feet. Managed by the Natural Resources Conservation Service, Viet No.1 is regulated, permitted, inspected, and enforced by the state agency DENR, ensuring its safety and compliance with regulations. With a low hazard potential and a condition assessment of "Not Rated," Viet No.1 plays a crucial role in water resource management in the region.
Situated in a rural area with no associated structures, Viet No.1 serves the primary purpose of water storage and management, contributing to flood control and water supply in the region. Despite its age, the dam has not been modified in recent years and lacks a formal Emergency Action Plan (EAP) or risk assessment. However, with a maximum discharge capacity of 1600 cubic feet per second, Viet No.1 remains a key infrastructure for mitigating potential flood risks and ensuring the safety of nearby communities.
As a significant feature in the St. Paul District of South Dakota, Viet No.1 provides valuable insights into the intersection of water resource management and climate resilience. With its strategic location along the TR MOREAU river and its capacity to store water, this dam highlights the importance of maintaining and monitoring essential infrastructure to adapt to changing climate conditions and ensure sustainable water management practices in the region.
Year Completed |
1962 |
Dam Length |
1280 |
Dam Height |
30 |
River Or Stream |
TR MOREAU |
Primary Dam Type |
Earth |
Hydraulic Height |
30 |
Nid Storage |
396 |
Hazard Potential |
Low |
Nid Height |
30 |
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.
Viet No.1