West Weta 91 (Nid) Reservoir Report
Nearby: Ireland Dam Grimes (Nid) (Aka Weta)
Last Updated: December 6, 2025
West Weta 91 (Nid) is a federally owned dam located in Jackson, South Dakota, with a primary purpose of fire protection, stock, and small fish pond management.
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Summary
Built in 1964 by the USDA Forest Service, this earth dam stands at 19 feet high with a hydraulic height of 24 feet and a length of 650 feet. The dam provides a storage capacity of 90 acre-feet and has a maximum discharge of 112 cubic feet per second.
While the dam is classified as low hazard potential and has not been rated for its condition assessment, it plays a vital role in maintaining water resources for the surrounding area. The dam's moderate risk assessment suggests a need for ongoing monitoring and potentially implementing risk management measures. Despite its uncontrolled spillway type and lack of surface area or drainage area data, West Weta 91 (Nid) remains a crucial infrastructure for water resource management in the region, serving multiple purposes and contributing to the overall ecosystem health.
As an enthusiast for water resources and climate, understanding the details and significance of West Weta 91 (Nid) provides insights into the complex relationship between infrastructure, water management, and environmental impact. With its location in Dry Draw and ownership by the Forest Service, this dam serves as a reminder of the interconnectedness of human activity and natural systems, highlighting the importance of responsible stewardship and sustainable practices for ensuring the long-term health and resilience of our water resources in the face of changing climate conditions.
Year Completed |
1964 |
Dam Length |
650 |
Dam Height |
19 |
River Or Stream |
DRY DRAW |
Primary Dam Type |
Earth |
Hydraulic Height |
24 |
Nid Storage |
90 |
Structural Height |
24 |
Hazard Potential |
Low |
Nid Height |
24 |
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.
Area Campgrounds
| Location | Reservations | Toilets |
|---|---|---|
Badlands/White River
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Cedar Pass - Badlands National Park
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Cedar Pass Campground
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Badlands Interior Campground
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West Weta 91 (Nid)