Robertson No.1 Reservoir Report
Nearby: Blessing No.1 Sully Dam
Last Updated: December 13, 2025
Located in Gregory, South Dakota, Robertson No.1 is a privately owned dam on Bull Creek, completed in 1975 with a height of 30 feet and a length of 1500 feet.
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Summary
The dam has a maximum storage capacity of 1998 acre-feet and a normal storage level of 1152 acre-feet. With a significant hazard potential, the dam is regulated by the South Dakota Department of Agriculture and Natural Resources, ensuring regular inspections, permitting, and enforcement to maintain its safety and compliance.
The dam's primary purpose and associated structures are not specified, but it serves as a crucial water resource in the region, contributing to flood control, irrigation, and water supply management. Despite its age, the dam's condition assessment is not rated, highlighting the need for further evaluation and potential upgrades to ensure long-term functionality and safety. Robertson No.1 plays a vital role in water management within the St. Paul District, supporting agriculture and local communities while facing the challenges of climate change and evolving water resource needs.
As a key infrastructure in the area, Robertson No.1 is overseen by private owners and state regulators, with a history of inspections dating back to 1981. With its significant storage capacity and critical location, the dam's risk potential and management measures warrant ongoing attention and monitoring. As water resource and climate enthusiasts, understanding the complexities and importance of structures like Robertson No.1 is crucial in safeguarding our natural ecosystems and ensuring sustainable water management practices for the future.
Year Completed |
1975 |
Dam Length |
1500 |
Dam Height |
30 |
River Or Stream |
BULL CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
30 |
Nid Storage |
1998 |
Hazard Potential |
Significant |
Nid Height |
30 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Platte Creek Near Platte
|
3cfs |
Keya Paha R At Wewela Sd
|
54cfs |
White R Near Oacoma Sd
|
105cfs |
Keya Paha R Near Keyapaha Sd
|
33cfs |
Niobrara River At Mariaville
|
1650cfs |
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.
Robertson No.1