Hattum Dam Reservoir Report
Nearby: Garber Dam Bennett Martin
Last Updated: December 10, 2025
Hattum Dam, located in Hughes County, South Dakota, is a privately owned structure designed by A1 Dirt & Gravel.
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Summary
Completed in 1999, this earth dam on the Tobin Draw river stands at a height of 31 feet and has a storage capacity of 155 acre-feet. With a low hazard potential and a moderate risk assessment rating, this dam plays a crucial role in water resource management in the region.
Despite its limited associated structures and lack of outlet gates, Hattum Dam serves as a key component in regulating water flow and providing flood control along the Tobin Draw. The dam's uncontrolled spillway, with a width of 100 feet, allows for the safe release of excess water during times of high discharge. While its condition assessment is currently listed as "Not Rated," the dam's state-regulated status ensures regular inspections and enforcement of safety measures.
Managed by private owners, Hattum Dam is a notable feature in the South Dakota landscape, contributing to the overall water management infrastructure in the area. As climate change continues to impact water resources, structures like Hattum Dam play a crucial role in ensuring the safety and sustainability of water supply for communities downstream. With its moderate risk assessment and state-regulated status, Hattum Dam stands as a testament to the importance of effective water resource management in the face of changing environmental conditions.
Year Completed |
1999 |
Dam Length |
383 |
Dam Height |
31 |
River Or Stream |
TOBIN DRAW |
Primary Dam Type |
Earth |
Hydraulic Height |
31 |
Drainage Area |
1 |
Nid Storage |
155 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
31 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Bad R Near Fort Pierre Sd
|
7cfs |
White R Near Oacoma Sd
|
105cfs |
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.
Hattum Dam