Pasture 8 Reservoir Report
Nearby: Wm T Malloy Dell Oliver
Last Updated: December 6, 2025
Pasture 8, located in Shadehill, South Dakota, is a federal-owned structure managed by the Forest Service for the primary purpose of serving as a Fish and Wildlife Pond.
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Summary
Constructed in 1985, this Earth-type dam stands at a height of 24 feet and has a storage capacity of 276 acre-feet. With a surface area of 22 acres and a drainage area of 2 square miles, Pasture 8 plays a vital role in conservation efforts and providing recreational opportunities in the area.
Despite being labeled as having a low hazard potential, Pasture 8 is considered to have a moderate risk level, with a maximum discharge capacity of 220 cubic feet per second. The dam is equipped with an uncontrolled spillway 135 feet wide, and its overall condition remains unrated as of the last inspection in October 2017. While emergency action plans and risk management measures are not specified, the structure's critical role in supporting wildlife and recreation underscores the importance of continued monitoring and maintenance to ensure its long-term sustainability and safety for the surrounding environment and community.
Water resource and climate enthusiasts will find Pasture 8 to be a fascinating example of the intersection between infrastructure development and natural resource conservation. Its role as a Fish and Wildlife Pond not only highlights the Forest Service's commitment to environmental stewardship but also underscores the need for ongoing risk assessment and management to mitigate potential hazards. As a key feature in the landscape of Perkins County, South Dakota, Pasture 8 serves as a reminder of the delicate balance between human activities and the preservation of ecosystems in the face of changing climate dynamics.
Year Completed |
1985 |
Dam Length |
300 |
Dam Height |
24 |
River Or Stream |
DRY |
Primary Dam Type |
Earth |
Surface Area |
22 |
Hydraulic Height |
21 |
Drainage Area |
2 |
Nid Storage |
276 |
Structural Height |
24 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
24 |
Seasonal Comparison
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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.
Pasture 8