Hazel Miller No.1 Reservoir Report
Nearby: John Gesinger No.1 Joe Gesinger No.1
Last Updated: December 14, 2025
Hazel Miller No.1 is a privately owned earth dam located in Dewey, South Dakota, along the TR MOREAU river.
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Summary
Completed in 1950, this dam stands at a height of 26 feet and has a storage capacity of 143 acre-feet. With a low hazard potential and a condition assessment of "Not Rated," this structure plays a crucial role in water resource management in the area.
Managed by the South Dakota Department of Environment and Natural Resources (DENR), Hazel Miller No.1 is regulated, permitted, inspected, and enforced by the state. Despite its age, the dam has not undergone any modifications in recent years, and its emergency action plan (EAP) status remains unclear. With a maximum discharge capacity of 900 cubic feet per second, this dam serves as a vital infrastructure for flood control and water supply in the region.
Although lacking some detailed information such as inspection dates and risk assessment status, Hazel Miller No.1 is a key component of the St. Paul District's water infrastructure. With its strategic location and functional design, this dam continues to play a critical role in managing water resources and maintaining environmental sustainability in South Dakota.
Year Completed |
1950 |
Dam Length |
650 |
Dam Height |
26 |
River Or Stream |
TR MOREAU |
Primary Dam Type |
Earth |
Hydraulic Height |
26 |
Nid Storage |
143 |
Hazard Potential |
Low |
Nid Height |
26 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Moreau R Near Whitehorse Sd
|
35cfs |
Grand R At Little Eagle Sd
|
47cfs |
Oak Cr Near Wakpala Sd
|
10cfs |
Bad R Near Fort Pierre Sd
|
7cfs |
Moreau R Near Faith Sd
|
14cfs |
Cheyenne R Near Plainview Sd
|
0cfs |
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.
Hazel Miller No.1