W. Knox Reservoir Report
Nearby: J. Peterson W. Peterson
Last Updated: December 12, 2025
W.
°F
°F
mph
Wind
%
Humidity
Summary
Knox is a private dam located in Hyde, South Dakota, specifically on the South Chapelle Creek. Constructed in 1941, this earth dam stands at 24 feet tall with a length of 680 feet, providing a storage capacity of 240 acre-feet. Managed by the South Dakota Department of Environment and Natural Resources (DENR), W. Knox is regulated, permitted, inspected, and enforced by the state agency to ensure its safety and compliance with regulations.
Despite its low hazard potential, W. Knox has not been rated for its condition assessment. The dam has not been modified over the years and does not have an Emergency Action Plan (EAP) in place, indicating potential areas for improvement in terms of emergency preparedness. With a maximum discharge of 1680 cfs, W. Knox serves as a crucial structure for water resource management in the area, highlighting the importance of regular inspections and risk assessments to maintain its integrity.
Overall, W. Knox provides valuable water storage capacity for the region, serving as a key structure on the South Chapelle Creek. As a privately-owned dam under state jurisdiction, its maintenance and safety are closely monitored by the DENR. Going forward, implementing an EAP and conducting regular condition assessments will be essential to ensure the continued effectiveness and safety of W. Knox for both water resource management and climate resilience in the area.
Year Completed |
1941 |
Dam Length |
680 |
Dam Height |
24 |
River Or Stream |
SOUTH CHAPELLE CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
24 |
Nid Storage |
240 |
Hazard Potential |
Low |
Nid Height |
24 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Bad R Near Fort Pierre Sd
|
7cfs |
White R Near Oacoma Sd
|
105cfs |
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.
W. Knox