L. M. Hanson Reservoir Report
Nearby: W. J. Asmussen L. M. Hanson No
Last Updated: December 13, 2025
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Summary
M. Hanson is a privately-owned earth dam located in Hyde, South Dakota, along the South Medicine Creek. Constructed in 1956 by the Natural Resources Conservation Service, this 21-foot tall structure serves as a water resource management system with a storage capacity of 126 acre-feet. Despite its age, the dam is classified as having a low hazard potential and is currently considered to be in "Not Rated" condition.
The dam plays a crucial role in controlling the flow of water in the area, with a maximum discharge capacity of 1320 cubic feet per second. While specific details about associated structures and inspection frequency are not available, the dam is regulated by the South Dakota Department of Environment and Natural Resources and undergoes state permitting, inspection, and enforcement processes. The primary purpose of the dam, as well as its associated structures, is not explicitly defined in the data provided.
Although the dam's emergency action plan (EAP) status, risk assessment, and management measures are not specified, its presence serves as a vital component in the local water resource infrastructure. With its strategic location and historical significance, L. M. Hanson stands as a testament to the importance of sustainable water management practices in the face of climate change challenges.
Year Completed |
1956 |
Dam Length |
360 |
Dam Height |
21 |
River Or Stream |
SOUTH MEDICINE CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
21 |
Nid Storage |
126 |
Hazard Potential |
Low |
Nid Height |
21 |
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.
L. M. Hanson