Williamson Dam Reservoir Report
Nearby: Anderson 5 John Anderson 2
Last Updated: December 5, 2025
Williamson Dam, located in Meade, South Dakota, is a privately owned earth dam completed in 1984 on Nine Mile Creek.
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Summary
With a height of 16 feet and a storage capacity of 220 acre-feet, this low hazard dam serves as a crucial water resource for the region. The dam's primary purpose and associated structures are not specified, but it is regulated and inspected by the South Dakota Department of Environment and Natural Resources.
The dam's low hazard potential is reassuring for nearby residents and environmental enthusiasts. While the condition assessment is currently not rated, the dam's location and design make it a reliable and efficient structure for water storage and management. The absence of a detailed Emergency Action Plan (EAP) and risk assessment may be areas for improvement, but overall, Williamson Dam plays a vital role in water resource management in the area.
With its proximity to Omaha District and the support of local congressman Dusty Johnson, Williamson Dam stands as a testament to effective water resource infrastructure in South Dakota. As climate change continues to impact water availability and quality, dams like Williamson are essential for providing sustainable water resources for future generations.
Year Completed |
1984 |
Dam Length |
460 |
Dam Height |
16 |
River Or Stream |
NINE MILE CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
16 |
Drainage Area |
30 |
Nid Storage |
220 |
Hazard Potential |
Low |
Nid Height |
16 |
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.
Williamson Dam