Olson Ranches Inc. #9 Reservoir Report
Nearby: Olson Ranches Inc. #10 Stirling #2
Last Updated: December 6, 2025
Olson Ranches INC.
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Summary
#9 is a privately owned dam located in Jones County, South Dakota, along a tributary of the Bad River. Built in 1956, this earth dam stands at a height of 26 feet with a length of 177 feet, providing storage capacity for water resources in the area. With a maximum discharge of 567 cubic feet per second, the dam serves a crucial role in regulating water flow and management in the region.
Managed by the South Dakota Department of Environment and Natural Resources (DENR), Olson Ranches INC. #9 is subject to state regulations, permitting, inspection, and enforcement to ensure its safe operation. Despite being classified as having a low hazard potential, the dam's condition assessment is currently not rated, highlighting the need for ongoing monitoring and maintenance. While the Emergency Action Plan status and risk assessment details are not provided, it is essential for water resource and climate enthusiasts to stay informed about the infrastructure's management and potential risks associated with it.
Overall, Olson Ranches INC. #9 plays a vital role in water resource management in South Dakota, serving as a key structure in the local watershed. With its strategic location and regulated oversight, the dam contributes to the overall resilience of the region's water infrastructure. As climate change continues to impact water resources, the maintenance and monitoring of dams like Olson Ranches INC. #9 become increasingly important for ensuring the safety and sustainability of water systems in the area.
Year Completed |
1956 |
Dam Length |
177 |
Dam Height |
26 |
River Or Stream |
TRIB. BAD RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
26 |
Nid Storage |
26 |
Hazard Potential |
Low |
Nid Height |
26 |
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.
Olson Ranches Inc. #9