R. Hanson Dam Reservoir Report
Nearby: Benson Dam
Last Updated: December 13, 2025
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Summary
Hanson Dam, located in Tripp, South Dakota, is a privately owned earth dam completed in 1975 with a height of 15 feet and a length of 364 feet. This dam plays a crucial role in regulating water flow in the Dry Draw river/stream, providing a maximum storage capacity of 190 acre-feet and a normal storage capacity of 110 acre-feet. With a low hazard potential and a current condition assessment of "Not Rated," R. Hanson Dam remains a key infrastructure for water resource management in the area.
Managed by the St. Paul District of the US Army Corps of Engineers, R. Hanson Dam is equipped with the necessary state-regulated permits, inspections, and enforcement measures to ensure its structural integrity and operational effectiveness. Despite not having a designated primary purpose, the dam serves as a vital component of the local water supply system and contributes to flood control and water conservation efforts in the region. With Dusty Johnson (R) representing the area in Congress, the dam benefits from political support and oversight.
As climate change continues to impact water resources and hydrological patterns, R. Hanson Dam's role in maintaining water security and mitigating potential risks becomes increasingly important. By adhering to state regulations, conducting regular inspections, and implementing proper risk management measures, this dam stands as a critical infrastructure ensuring the resilience of water resources in Tripp, South Dakota, and beyond.
Year Completed |
1975 |
Dam Length |
364 |
Dam Height |
15 |
River Or Stream |
DRY DRAW |
Primary Dam Type |
Earth |
Hydraulic Height |
15 |
Nid Storage |
190 |
Hazard Potential |
Low |
Nid Height |
15 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Keya Paha R Near Keyapaha Sd
|
33cfs |
Keya Paha R At Wewela Sd
|
54cfs |
Niobrara River Near Sparks
|
969cfs |
Long Pine Creek Near Riverview
|
191cfs |
Little White R Near Rosebud Sd
|
96cfs |
Niobrara River At Mariaville
|
1650cfs |
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.
Sargent Irrigation Dam