Collins No.1 Reservoir Report
Nearby: Collins No.2 Jim's Creek Dam
Last Updated: December 6, 2025
Collins No.1 is a privately owned dam located on the TR MOREAU RIVER in Harding, South Dakota.
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Summary
Constructed in 1959 by the Natural Resources Conservation Service, this earth dam stands at a height of 23 feet and spans 495 feet in length. With a storage capacity of 55 acre-feet, the dam serves to regulate water flow and provide flood control for the surrounding area. Despite its low hazard potential and current "Not Rated" condition assessment, the dam is subject to state regulations and inspections to ensure its continued safety and functionality.
Situated within the jurisdiction of the South Dakota Department of Environment and Natural Resources, Collins No.1 is equipped with necessary state permitting, inspection, and enforcement mechanisms. Although the dam does not have an Emergency Action Plan (EAP) in place and its risk assessment remains unspecified, it meets state guidelines for operation and maintenance. The dam's maximum discharge capacity is 375 cubic feet per second, further highlighting its crucial role in managing water resources and mitigating potential flooding risks in the region. As a key component of the local water infrastructure, Collins No.1 contributes to the overall resilience of the area against the impacts of climate change and extreme weather events.
With its strategic location and essential functions, Collins No.1 holds significance for water resource and climate enthusiasts alike. As a vital piece of infrastructure in South Dakota, this dam plays a crucial role in safeguarding the surrounding community and ecosystem from the adverse effects of water-related disasters. By adhering to state regulations and undergoing regular inspections, Collins No.1 continues to serve as a reliable asset in water management and climate adaptation efforts. Its low hazard potential and sound structural integrity underscore its importance in ensuring the sustainable use of water resources and resilience in the face of changing climate conditions.
Year Completed |
1959 |
Dam Length |
495 |
Dam Height |
23 |
River Or Stream |
TR MOREAU RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
23 |
Nid Storage |
55 |
Hazard Potential |
Low |
Nid Height |
23 |
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.1