White River Grazing Assoc. No.1 Reservoir Report
Nearby: Perry Dam White River Association #3
Last Updated: December 13, 2025
White River Grazing Assoc.
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Summary
No.1 is a privately owned dam located in Mellette, South Dakota, along a tributary of the White River. The earth dam, completed in 1960, stands at a height of 26 feet and has a storage capacity of 19 acre-feet. With a low hazard potential and a condition assessment that is currently not rated, the dam serves as a vital resource for water management in the area.
Managed by the South Dakota Department of Environment and Natural Resources (DENR), White River Grazing Assoc. No.1 is subject to state regulations, permitting, inspection, and enforcement. Although the dam has not been assessed for its emergency action plan readiness, it is closely monitored to ensure its safety and functionality. The dam's primary purpose, as well as any associated structures or modifications, remains unspecified in the available data.
Climate and water resource enthusiasts can appreciate the significance of White River Grazing Assoc. No.1 in maintaining water levels and supporting agricultural activities in the region. With its strategic location and relatively low risk profile, this dam plays a crucial role in water management efforts along the White River watershed. As efforts to address climate change and water scarcity continue to evolve, understanding the infrastructure and regulations surrounding dams like White River Grazing Assoc. No.1 becomes increasingly important for sustainable resource management.
Year Completed |
1960 |
Dam Length |
300 |
Dam Height |
26 |
River Or Stream |
TRIB. WHITE RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
26 |
Nid Storage |
19 |
Hazard Potential |
Low |
Nid Height |
26 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
White River Near White River
|
42cfs |
Little White R Below White River Sd
|
141cfs |
White R Near Oacoma Sd
|
105cfs |
Keya Paha R Near Keyapaha Sd
|
33cfs |
Little White R Near Rosebud Sd
|
96cfs |
Bad R Near Fort Pierre Sd
|
7cfs |
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.
White River Grazing Assoc. No.1