Hamill Dam Reservoir Report
Nearby: Snow Dam Linker Dam
Last Updated: December 13, 2025
Hamill Dam, located in Tripp, South Dakota, is a crucial water resource managed by the Tribal Government.
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Summary
Completed in 1933, this earth dam stands at 21 feet high and stretches for 752 feet along the TRIB. WHITE RIVER. With a storage capacity of 580 acre-feet, it primarily serves as a water supply source for the region, supporting purposes such as fire protection, stock, recreation, and small fish pond maintenance. The dam's low hazard potential and "Not Rated" condition assessment indicate a stable structure that contributes to the community's water management needs.
Operated by the St. Paul District of the USACE, Hamill Dam is subject to state regulations and inspections, ensuring its continued safe operation and maintenance. Although the dam has not been rated for its current condition, its historical significance and functional role in water supply highlight its importance in the region's water resource management. With Dusty Johnson (R) serving as the Congressional Representative for the area, the dam plays a vital role in water supply and resource preservation efforts in South Dakota.
Water resource and climate enthusiasts can appreciate Hamill Dam not only for its historical significance but also for its practical contributions to water supply and management in the Tripp region. As a low-hazard structure with a stable condition, the dam exemplifies the importance of infrastructure in ensuring reliable water access for various community needs. With a focus on water supply and regulated by the DENR, Hamill Dam stands as a testament to effective water resource management in South Dakota, serving as a key asset for the Tribal Government and local residents alike.
Year Completed |
1933 |
Dam Length |
752 |
Dam Height |
21 |
River Or Stream |
TRIB. WHITE RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
21 |
Nid Storage |
580 |
Structural Height |
21 |
Hazard Potential |
Low |
Nid Height |
21 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
White R Near Oacoma Sd
|
105cfs |
Keya Paha R Near Keyapaha Sd
|
33cfs |
Keya Paha R At Wewela Sd
|
54cfs |
Platte Creek Near Platte
|
3cfs |
White River Near White River
|
42cfs |
Little White R Below White River Sd
|
141cfs |
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.
Hamill Dam