Letellier Reservoir Report
Nearby: Carr #5 Leteililer No. 1
Last Updated: December 8, 2025
Letellier, located in Mellette, South Dakota, is a privately owned dam that was completed in 1955.
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Summary
Standing at a height of 25 feet, Letellier serves as a crucial structure on the tributary of Pine Creek, providing a storage capacity of 20 acre-feet. The dam plays a role in regulating water flow and ensuring water security in the region, with a maximum discharge capacity of 445 cubic feet per second.
Managed by the South Dakota Department of Environment and Natural Resources (DENR), Letellier is classified as a low hazard potential dam with a condition assessment of "Not Rated." Despite lacking a formal emergency action plan and updated contact information, the dam is regularly inspected, permitted, and enforced by state regulatory agencies. With a focus on safety and compliance, Letellier contributes to water resource management efforts in the area.
As a vital component of the local water infrastructure, Letellier stands as a testament to the importance of maintaining and monitoring dams for both water resource management and climate resilience. Its strategic location and functions highlight the significance of private ownership in upholding water security and regulatory standards in the region. Through continued oversight and collaboration with state agencies, Letellier plays a crucial role in safeguarding the surrounding community from potential hazards and ensuring sustainable water management practices for years to come.
Year Completed |
1955 |
Dam Length |
268 |
Dam Height |
25 |
River Or Stream |
TRIB. PINE CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
25 |
Nid Storage |
20 |
Hazard Potential |
Low |
Nid Height |
25 |
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.
Letellier