Lee Calhoon 2 Reservoir Report

Last Updated: December 13, 2025

Lee Calhoon 2 is a privately owned dam located in Tripp, South Dakota, along the White River Off Stream.


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Summary

Built in 1965, this earth dam stands at 28 feet in height and spans 338 feet in length, with a storage capacity of 35 acre-feet. Managed by the Natural Resources Conservation Service, the dam is regulated by the South Dakota Department of Environment and Natural Resources, ensuring regular inspections and enforcement of safety measures.

Despite its low hazard potential, Lee Calhoon 2 has not been given a formal condition assessment. However, with a maximum discharge of 1260 cubic feet per second and a normal storage capacity of 20 acre-feet, this dam plays a crucial role in water resource management in the region. Its proximity to the White River also underscores its importance in mitigating flooding and maintaining water supply for the surrounding area.

With its strategic location and vital role in water conservation, Lee Calhoon 2 serves as a key infrastructure for climate resilience in South Dakota. As water resource and climate enthusiasts, understanding the significance of this dam and its management by state and federal agencies is essential for ensuring the sustainability of water systems in the region.

Year Completed

1965

Dam Length

338

Dam Height

28

River Or Stream

WHITE RIVER OFF STREAM

Primary Dam Type

Earth

Hydraulic Height

28

Nid Storage

35

Hazard Potential

Low

Nid Height

28
       
Seasonal Comparison

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Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.