Shadehill Dike No. 1 Reservoir Report
Nearby: Shadehill Dike No. 2 Shadehill
Last Updated: December 6, 2025
Shadehill Dike No.
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Summary
1, located in Shadehill, South Dakota, is a federal-owned structure managed by the Bureau of Reclamation, serving as a critical element in the water resource management system. Built in 1951, this Earth-type dike stands at a height of 19 feet and spans 264 feet in length, with a capacity to store 468,585 acre-feet of water from the Grand River Offstream. Despite its age, the dam's hazard potential is rated as high, emphasizing the importance of regular inspections and risk assessments.
The primary purpose of Shadehill Dike No. 1 is to control and manage water flow in the area, with a particular focus on flood prevention and storage during periods of heavy rainfall. The dam's close association with the Bureau of Reclamation ensures active oversight and regulation to maintain its structural integrity and operational efficiency. With a high risk assessment rating, ongoing monitoring and management measures are essential to mitigate potential hazards and safeguard surrounding communities from any adverse impacts.
As a significant component of the water infrastructure in Perkins County, South Dakota, Shadehill Dike No. 1 plays a crucial role in protecting the region from flooding events and ensuring sustainable water resource management. Its strategic location and design features, including a rock foundation and Arch core type, highlight the engineering expertise invested in its construction. Continued collaboration between federal agencies and local authorities is vital to uphold the dam's functionality and resilience in the face of evolving climate challenges and water resource demands.
Year Completed |
1951 |
Dam Length |
264 |
Dam Height |
19 |
River Or Stream |
GRAND RIVER OFFSTREAM |
Primary Dam Type |
Earth |
Hydraulic Height |
3 |
Nid Storage |
468585 |
Structural Height |
18 |
Hazard Potential |
High |
Foundations |
Rock |
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.
Shadehill Dike No. 1