Archie Millard #1 Reservoir Report
Nearby: Alfred Hutchinson Floyd Sletto
Last Updated: December 13, 2025
Archie Millard #1 is a privately owned earth dam located in Lyman, South Dakota, along the White River off-stream.
°F
°F
mph
Wind
%
Humidity
Summary
Completed in 1960, this dam stands at a height of 27 feet and has a length of 560 feet, providing a storage capacity of 28 acre-feet. The dam is regulated by the South Dakota Department of Environment and Natural Resources, with inspection, permitting, and enforcement processes in place to ensure its safety and compliance with state regulations.
Despite being rated as having a low hazard potential and not having a current condition assessment, Archie Millard #1 serves a crucial role in water resource management in the region. The dam has a maximum discharge capacity of 600 cubic feet per second, offering flood protection and water storage capabilities. The primary purpose of this structure, managed by the Natural Resources Conservation Service, is to contribute to irrigation, water supply, and environmental conservation efforts in the area.
With its strategic location and essential functions, Archie Millard #1 plays a significant role in maintaining water security and climate resilience in Lyman, South Dakota. As a key infrastructure asset managed by a private entity, this dam highlights the importance of effective collaboration between private owners and state regulatory agencies to ensure the safety and efficiency of water resource management systems.
Year Completed |
1960 |
Dam Length |
560 |
Dam Height |
27 |
River Or Stream |
WHITE RIVER OFF STREAM |
Primary Dam Type |
Earth |
Hydraulic Height |
27 |
Nid Storage |
28 |
Hazard Potential |
Low |
Nid Height |
27 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
White R Near Oacoma Sd
|
105cfs |
White River Near White River
|
42cfs |
Little White R Below White River Sd
|
141cfs |
Bad R Near Fort Pierre Sd
|
7cfs |
Keya Paha R Near Keyapaha Sd
|
33cfs |
Little White R Near Rosebud Sd
|
96cfs |
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.
Archie Millard #1