Collins No.2 Reservoir Report
Nearby: Collins No.1 Jim's Creek Dam
Last Updated: December 6, 2025
Collins No.2, located in Harding, South Dakota, is a privately owned Earth dam constructed in 1950 with a height of 21 feet and a length of 820 feet.
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Summary
The dam has a maximum storage capacity of 90 acre-feet and normal storage of 38 acre-feet, serving the purpose of water resource management along the TR Moreau River. Managed by the Natural Resources Conservation Service, the dam is regulated by the South Dakota Department of Environment and Natural Resources, with state permitting, inspection, and enforcement in place to ensure its safety and functionality.
Despite its low hazard potential, Collins No.2 has not been rated for its condition assessment, and emergency action plans are yet to be prepared and updated. The dam has not undergone any modifications over the years, with no associated structures or inspection frequency specified. The dam's risk assessment, management measures, and inundation maps are also lacking, raising concerns about its emergency preparedness and response capabilities in the event of a potential failure or disaster. With a maximum discharge capacity of 250 cubic feet per second, stakeholders and water resource enthusiasts may advocate for improved monitoring, maintenance, and risk mitigation strategies to safeguard the surrounding community and environment.
Year Completed |
1950 |
Dam Length |
820 |
Dam Height |
21 |
River Or Stream |
TR MOREAU RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
21 |
Nid Storage |
90 |
Hazard Potential |
Low |
Nid Height |
21 |
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.
Collins No.2