Deiss No. 1 Reservoir Report
Nearby: Krogman No.1 Krogman #4
Last Updated: December 8, 2025
Deiss No.
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Summary
1 is a privately owned earth dam located in Mellette, South Dakota, along a tributary of the Little White River. Built in 1971, this dam stands at a height of 25 feet and has a length of 325 feet. With a storage capacity of 18 acre-feet, it serves the purpose of water resource management in the area.
Managed by the South Dakota Department of Environment and Natural Resources (DENR), Deiss No. 1 is regulated, inspected, and enforced for safety measures. Despite being classified as having a low hazard potential, its condition assessment is marked as "Not Rated," indicating a need for further evaluation. The dam's emergency action plan status, risk assessment, and management measures are also yet to be documented, raising concerns for preparedness in case of potential hazards.
Overall, Deiss No. 1 represents a significant piece of infrastructure in South Dakota's water resource management system. As an earth dam with a modest storage capacity, it plays a crucial role in mitigating flood risks and ensuring water availability for the region. However, the lack of comprehensive assessments and emergency preparedness measures highlight the importance of continued monitoring and maintenance to safeguard both the dam's integrity and the surrounding community from potential climate-related challenges.
Year Completed |
1971 |
Dam Length |
325 |
Dam Height |
25 |
River Or Stream |
TRIB. LITTLE WHITE RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
25 |
Nid Storage |
18 |
Hazard Potential |
Low |
Nid Height |
25 |
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.
Deiss No. 1