Dolezal Number 1 Reservoir Report
Nearby: Dolezal No. 9 Dolezal No. 6
Last Updated: December 13, 2025
Dolezal Number 1 is a privately owned dam located in Mellette, South Dakota, along the Little White River.
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Summary
Built in 1963, this Earth-type dam stands at a height of 26 feet and has a length of 540 feet, with a storage capacity of 28 acre-feet. Despite its age, the dam is in relatively good condition, with a low hazard potential and a current condition assessment of "Not Rated".
Managed by the South Dakota Department of Environment and Natural Resources (DENR), Dolezal Number 1 is subject to state regulation, permitting, inspection, and enforcement. The dam has a normal storage capacity of 15 acre-feet and can handle a maximum discharge of 550 cubic feet per second. While the dam does not have an emergency action plan (EAP) in place, it is deemed to meet safety guidelines and poses a low risk to surrounding areas in case of a dam failure.
Located within the St. Paul District of the US Army Corps of Engineers, Dolezal Number 1 serves as a vital infrastructure for water resource management in the region. With its historical significance and essential role in flood control and water supply, this dam stands as a testament to the importance of maintaining and monitoring our water resources in the face of changing climate conditions.
Year Completed |
1963 |
Dam Length |
540 |
Dam Height |
26 |
River Or Stream |
TRIB-LITTLE WHITE RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
26 |
Nid Storage |
28 |
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 Number 1