G. Flier Reservoir Report
Nearby: Earl Witte No.1 M. Scism No.1
Last Updated: December 5, 2025
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Summary
Flier is a privately owned dam located in Custer, South Dakota, along the TR-Cheyenne River. Built in 1958, this earth dam stands at a height of 19 feet and has a length of 645 feet, providing a maximum storage capacity of 84 acre-feet. The dam is regulated by the South Dakota Department of Environment and Natural Resources, with state jurisdiction, permitting, inspection, and enforcement in place to ensure its safety and compliance.
This low-hazard dam has not been rated for its condition assessment, and no emergency action plan (EAP) or risk assessment measures have been reported. Despite its relatively small storage capacity and low hazard potential, G. Flier plays a crucial role in water resource management and flood control for the surrounding area. The dam is under the oversight of the Natural Resources Conservation Service for design and construction, highlighting the collaboration between private owners and federal agencies in safeguarding water resources in South Dakota.
With a maximum discharge capacity of 2100 cubic feet per second, G. Flier serves as a vital structure in mitigating potential flood risks and regulating water flow along the TR-Cheyenne River. As climate change continues to impact water resources and weather patterns, the maintenance and monitoring of dams like G. Flier are essential for sustainable water management and resilience in the face of changing environmental conditions.
Year Completed |
1958 |
Dam Length |
645 |
Dam Height |
19 |
River Or Stream |
TR-CHEYENNE |
Primary Dam Type |
Earth |
Hydraulic Height |
19 |
Nid Storage |
84 |
Hazard Potential |
Low |
Nid Height |
19 |
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.
G. Flier