Robert Week Reservoir Report
Nearby: Raymond Meyer White Hill Dam
Last Updated: December 6, 2025
Robert Week is a private earth dam located in Perkins, South Dakota, along the Tributary South Fork Grand River.
°F
°F
mph
Wind
%
Humidity
Summary
Built in 1955, this dam stands at a height of 18 feet and has a storage capacity of 52 acre-feet. Despite being classified as low hazard potential, Robert Week 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.
Managed by a private owner, Robert Week has not been rated for its condition assessment, but it undergoes regular inspections to maintain its structural integrity. With a maximum discharge capacity of 200 cubic feet per second, this dam serves the primary purpose of water resource management for the surrounding area. Its location within the Omaha District and close proximity to Dusty Johnson (R), the Congressional Representative, underscores its importance in the local water resource infrastructure.
For water resource and climate enthusiasts, Robert Week offers an intriguing case study of a privately owned earth dam in South Dakota. With its historical significance dating back to the mid-20th century and its role in managing water flow along the Tributary South Fork Grand River, this dam serves as a notable example of how private entities can contribute to water resource management. As efforts continue to assess and monitor its safety and compliance, Robert Week stands as a testament to the ongoing dialogue and action surrounding water infrastructure in the region.
Year Completed |
1955 |
Dam Length |
280 |
Dam Height |
18 |
River Or Stream |
TRIB. SOUTH FORK GRAND RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
18 |
Nid Storage |
52 |
Hazard Potential |
Low |
Nid Height |
18 |
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.
Robert Week