Logan Dam Reservoir Report
Nearby: Fordham Dam Seefeldt Dam
Last Updated: December 13, 2025
Logan Dam, located in Clark, South Dakota, is a state-owned structure completed in 1936 by the Works Progress Administration (WPA).
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Summary
This earth dam stands at a height of 18 feet and has a storage capacity of 860 acre-feet, with a normal storage level of 180 acre-feet. The dam, situated on a tributary of Foster Creek, serves a primary purpose that is not specified in the available data.
Despite being classified as low hazard potential, Logan Dam is subject to regular state regulation, inspection, and enforcement to ensure its safety and compliance. The dam features an uncontrolled spillway with a width of 30 feet and a maximum discharge capacity of 1,600 cubic feet per second. Although the condition assessment is listed as "Not Rated," the risk assessment for the dam is moderate, indicating a potential need for ongoing risk management measures.
Overall, Logan Dam is an integral part of the water resource infrastructure in South Dakota, providing essential storage and flood control capabilities. With a rich history dating back to the New Deal era, the dam continues to be monitored and maintained to mitigate potential risks and ensure the safety of surrounding communities. As a valuable asset in the state's water management strategy, Logan Dam highlights the importance of proactive maintenance and regulatory oversight in safeguarding water resources and climate resilience.
Year Completed |
1936 |
Dam Length |
400 |
Dam Height |
18 |
River Or Stream |
TRIB. FOSTER CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
18 |
Nid Storage |
860 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
18 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
James R Near Redfield Sd
|
468cfs |
James R At Ashton Sd
|
418cfs |
James R At Huron Sd
|
548cfs |
James R Near Stratford Sd
|
409cfs |
Big Sioux R At Watertown Sd
|
26cfs |
Big Sioux R Near Watertown Sd
|
19cfs |
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.
Logan Dam