White Rock Colony Nouth Dam Reservoir Report
Last Updated: December 14, 2025
White Rock Colony North Dam in South Dakota is a privately owned structure regulated by the state agency DENR.
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Summary
This earth dam, standing at a height of 18 feet and with a length of 270 feet, serves the primary purpose of water storage along the Bois De Sioux River. With a storage capacity of 100 acre-feet and a maximum discharge rate of 950 cubic feet per second, the dam has a low hazard potential and a moderate risk assessment rating of 3.
Although the dam's condition is not rated, it undergoes regular state inspections, permitting, and enforcement to ensure its safety and functionality. The spillway, which is uncontrolled and 25 feet wide, provides essential flood control measures for the surrounding area. The dam's risk management measures and emergency action plan status are not provided in the data, but its location and design indicate its importance for water resource management and climate resilience efforts in Roberts County, South Dakota.
Dam Length |
270 |
Dam Height |
18 |
River Or Stream |
Bois De Sioux River-TR |
Primary Dam Type |
Earth |
Hydraulic Height |
18 |
Nid Storage |
100 |
Outlet Gates |
None |
Hazard Potential |
Low |
Nid Height |
18 |
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.
White Rock Colony Nouth Dam
Mud Lake Above White Rock Dam Near White Rock