Dolezal No.4 Reservoir Report
Nearby: Dolezal No. 2 Dolezal No.5
Last Updated: December 13, 2025
Dolezal No.4 is a privately owned dam located in Mellette, South Dakota, along the tributary of Little White River.
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Summary
Built in 1969, this earth dam stands at a height of 26 feet with a length of 400 feet, providing a storage capacity of 29 acre-feet. Despite its low hazard potential, the dam is regulated and inspected by the South Dakota Department of Environment and Natural Resources to ensure compliance with state regulations.
The dam, managed by a private owner, serves multiple purposes including irrigation, flood control, and water supply. With a maximum discharge capacity of 1134 cubic feet per second, Dolezal No.4 plays a crucial role in managing water resources in the area. Although its condition assessment is currently "Not Rated," the dam is subject to regular inspections to maintain its structural integrity and ensure public safety.
Located within the St. Paul District of the US Army Corps of Engineers jurisdiction, Dolezal No.4 is an essential component of the local water infrastructure. With its historical significance dating back to the late 1960s, this dam continues to play a vital role in water management and climate resilience efforts in South Dakota.
Year Completed |
1969 |
Dam Length |
400 |
Dam Height |
26 |
River Or Stream |
TRIB. LITTLE WHITE RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
26 |
Nid Storage |
29 |
Hazard Potential |
Low |
Nid Height |
26 |
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.
Dolezal No.4