G. Holloway Reservoir Report
Nearby: Glen Holloway Don Farlee
Last Updated: December 7, 2025
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Summary
Holloway, also known as Lantry, is a privately owned earth dam located in Dewey County, South Dakota. This dam, completed in 1936, serves the primary purpose of water resource management along the TR-MOREAU river or stream. With a height of 23 feet and a length of 890 feet, G. Holloway has a storage capacity of 690 acre-feet and a maximum discharge rate of 600 cubic feet per second. Despite being classified as a low hazard potential structure, the dam is regulated by the South Dakota Department of Environment and Natural Resources (DENR), with state permitting, inspection, and enforcement in place.
Situated within the St. Paul District of the US Army Corps of Engineers, G. Holloway plays a critical role in flood control and water supply for the region. While the dam's condition assessment is currently marked as "Not Rated," its emergency action plan status and risk management measures are not specified. The structure has not been modified in recent years, and details on associated structures, outlet gates, or inundation maps are not provided. Overall, G. Holloway stands as a testament to early 20th-century engineering and continues to support the water needs of Dewey County with its efficient design and operational capabilities.
For water resource and climate enthusiasts, G. Holloway represents a remarkable piece of infrastructure that intersects with environmental stewardship and public safety. As climate change impacts become more pronounced, the role of dams like G. Holloway in managing water resources and mitigating risks will be increasingly crucial. Understanding the regulatory framework, operational aspects, and potential future challenges faced by G. Holloway can provide valuable insights into sustainable water management practices in the face of a changing climate.
Year Completed |
1936 |
Dam Length |
890 |
Dam Height |
23 |
River Or Stream |
TR-MOREAU |
Primary Dam Type |
Earth |
Hydraulic Height |
23 |
Nid Storage |
690 |
Hazard Potential |
Low |
Nid Height |
23 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Moreau R Near Whitehorse Sd
|
35cfs |
Moreau R Near Faith Sd
|
14cfs |
Cheyenne R Near Plainview Sd
|
0cfs |
Grand R At Little Eagle Sd
|
47cfs |
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.
G. Holloway