Pasture 6en Du Swsw Reservoir Report
Nearby: South Fork Impoundment Chapman Dam
Last Updated: December 6, 2025
Pasture 6en Du SWSw, located in Shadehill, South Dakota, is a Federal-owned Earth dam completed in 1985 for the primary purpose of serving as a Fish and Wildlife Pond.
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Summary
The dam stands at a height of 24 feet with a hydraulic height of 18 feet, and a length of 650 feet. It has a normal storage capacity of 175 acre-feet and covers a surface area of 16 acres, with a drainage area of 8 acres. The dam has a low hazard potential and has not been rated for its condition assessment.
Managed by the Forest Service, Pasture 6en Du SWSw is utilized for fire protection, stock, small fish pond, and recreational purposes in addition to its primary function for fish and wildlife. The dam's spillway type is uncontrolled, with a spillway width of 150 feet. The maximum discharge capacity of the dam is 1174 cubic feet per second. Despite being moderate risk-rated, the dam does not have an Emergency Action Plan prepared, and its last inspection was conducted in October 2017 with a frequency of every 10 years.
Water resource enthusiasts will be intrigued by the unique design and purpose of Pasture 6en Du SWSw, which serves as a vital habitat for fish and wildlife in the region. The dam's construction by the Forest Service showcases the importance of sustainable water management practices in maintaining biodiversity and supporting recreational activities. As a significant feature in the landscape of Shadehill, South Dakota, this dam offers a glimpse into the intricate balance between human needs and environmental conservation efforts in the area.
Year Completed |
1985 |
Dam Length |
650 |
Dam Height |
24 |
River Or Stream |
DRY |
Primary Dam Type |
Earth |
Surface Area |
16 |
Hydraulic Height |
18 |
Drainage Area |
8 |
Nid Storage |
175 |
Structural Height |
24 |
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 6en Du Swsw