Carr John Jr No.2 Reservoir Report
Last Updated: December 8, 2025
Carr John Jr No.2 is a privately owned dam located in Mellette, South Dakota, with a low hazard potential and a height of 27 feet.
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Summary
Constructed in 1968 by the Natural Resources Conservation Service, this earth dam serves the primary purpose of offstream water storage for the TR N Branch Pine Creek. With a maximum storage capacity of 26 acre-feet and a normal storage of 21 acre-feet, this dam plays a crucial role in managing water resources in the area.
Despite being a privately owned structure, Carr John Jr No.2 is regulated by the South Dakota Department of Environment and Natural Resources, ensuring that it meets the necessary safety and environmental standards. The dam has not been rated for its condition assessment, but it has not undergone significant modifications over the years. With a maximum discharge capacity of 750 cubic feet per second, this dam is equipped to handle potential flooding events and ensure the safety of the surrounding community.
While Carr John Jr No.2 may not be a high-risk structure, its presence highlights the importance of maintaining and monitoring dams to prevent potential hazards and ensure the efficient management of water resources. As climate change continues to impact water availability and quality, structures like this play a vital role in securing water supplies for agriculture, wildlife, and local communities. The collaboration between private owners and state regulatory agencies is essential in safeguarding these critical infrastructure assets for the future.
Year Completed |
1968 |
Dam Length |
520 |
Dam Height |
27 |
River Or Stream |
TR N BRANCH PINE CR OFFSTREAM |
Primary Dam Type |
Earth |
Hydraulic Height |
27 |
Nid Storage |
26 |
Hazard Potential |
Low |
Nid Height |
27 |
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.
Carr John Jr No.2