Oakley Eide No.3 Reservoir Report
Nearby: Oakley Eide No.2 Oakley Eide No.1
Last Updated: December 13, 2025
Oakley Eide No.3 is a private-owned earth dam located in Gregory, South Dakota, along the South Fork Whetstone Creek.
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Summary
Built in 1975, this dam stands at a height of 43 feet with a hydraulic height of 30 feet and a length of 350 feet. It has a storage capacity of 100 acre-feet and a maximum discharge of 4902 cubic feet per second.
Although this dam has a low hazard potential, its condition assessment is currently labeled as "Not Rated" as it has not been inspected since July 1991. However, it is regulated and permitted by the South Dakota Department of Agriculture and Natural Resources, and has state jurisdiction, inspection, and enforcement in place. Despite lacking specific information on its purpose and design, Oakley Eide No.3 serves as an important structure for water resource management in the area.
With its location in a critical watershed area and its importance in managing the flow of South Fork Whetstone Creek, Oakley Eide No.3 is a key infrastructure for water resource and climate enthusiasts to monitor. Its historical completion in 1975 highlights its longevity and continued relevance in the region's water management efforts. As a privately owned dam with state regulation and inspection, there is a need for ongoing assessment and maintenance to ensure its safety and effectiveness in the face of changing environmental conditions.
Year Completed |
1975 |
Dam Length |
350 |
Dam Height |
43 |
River Or Stream |
S FORK WHETSTONE CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
30 |
Nid Storage |
100 |
Hazard Potential |
Low |
Nid Height |
43 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Platte Creek Near Platte
|
3cfs |
Keya Paha R At Wewela Sd
|
54cfs |
Niobrara River At Mariaville
|
1650cfs |
White R Near Oacoma Sd
|
105cfs |
Keya Paha R Near Keyapaha Sd
|
33cfs |
Long Pine Creek Near Riverview
|
191cfs |
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.
Oakley Eide No.3