Lnot Ratedz Reservoir Report
Nearby: Pierce Dam Gordon Babcock
Last Updated: December 6, 2025
Lnot Ratedz is a privately owned dam located in Pennington, South Dakota, along the TR-CHEYENNE river.
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Summary
Built in 1957, this earth dam stands at 20 feet in height and spans 430 feet in length, providing a storage capacity of 80 acre-feet with a maximum discharge of 375 cubic feet per second. Despite its age, the dam is classified as having a low hazard potential and has not been rated for its condition as of yet.
Managed by the Natural Resources Conservation Service, Lnot Ratedz falls under the regulatory jurisdiction of the South Dakota Department of Environment and Natural Resources. With state permitting, inspection, and enforcement in place, this dam serves its primary purpose effectively. While lacking in detailed information about its current condition assessment and emergency preparedness measures, Lnot Ratedz remains a key structure for water resource management in the region.
Enthusiasts in water resources and climate can appreciate Lnot Ratedz as a vital piece of infrastructure in South Dakota, contributing to flood control and water storage along the TR-CHEYENNE river. With its historical significance and ongoing regulatory oversight, this dam underscores the importance of sustainable water management practices in the face of evolving climate challenges. Further monitoring and assessment of Lnot Ratedz will ensure its continued reliability and safety for the surrounding community and ecosystem.
Year Completed |
1957 |
Dam Length |
430 |
Dam Height |
20 |
River Or Stream |
TR-CHEYENNE |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Nid Storage |
80 |
Hazard Potential |
Low |
Nid Height |
20 |
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.
Lnot Ratedz