K. Darland Reservoir Report
Nearby: Lowell West Dam K. Sutton
Last Updated: December 10, 2025
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Summary
Darland, located in Sully, South Dakota, is a privately owned earth dam with a height of 25 feet and a length of 812 feet. Completed in 1938, this dam has a storage capacity of 600 acre-feet and a maximum discharge of 3720 cubic feet per second. Despite its age, K. Darland has a low hazard potential and its condition is currently rated as "Not Rated".
Managed by the South Dakota Department of Environment and Natural Resources (DENR), K. Darland is regulated, permitted, inspected, and enforced by the state. The dam is situated on the TR-MISSONot RatedI river or stream and falls under the jurisdiction of the St. Paul District of the US Army Corps of Engineers. Dusty Johnson, a Republican, is the Congressional Representative for the area where K. Darland is located.
While specific details on the dam's purposes and emergency preparedness measures are not provided, the data indicates that K. Darland meets state guidelines and has not been assigned a Dam Safety Action Classification (DSAC) date. Overall, K. Darland presents an intriguing case study for water resource and climate enthusiasts interested in the management and maintenance of aging infrastructure in South Dakota.
Year Completed |
1938 |
Dam Length |
812 |
Dam Height |
25 |
River Or Stream |
TR-MISSONot RatedI |
Primary Dam Type |
Earth |
Hydraulic Height |
25 |
Nid Storage |
600 |
Hazard Potential |
Low |
Nid Height |
25 |
Seasonal Comparison
Weather Forecast
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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.
K. Darland