John Carr Jr. No. 4 Reservoir Report
Nearby: Carr John Jr No.2 Huber #1
Last Updated: December 8, 2025
John Carr Jr.
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Summary
No. 4 is a privately owned dam located in Mellette, South Dakota, along the tributary of Pine Creek. Built in 1972, this earth dam stands at a height of 25 feet and has a storage capacity of 30 acre-feet. With a low hazard potential, this dam has not been rated for its condition assessment, but is regularly inspected, permitted, and enforced by the South Dakota Department of Environment and Natural Resources.
Situated within the St. Paul District of the US Army Corps of Engineers, John Carr Jr. No. 4 plays a crucial role in water resource management and flood control in the region. The dam's primary purpose, although not specified, serves to protect the surrounding area from potential flooding events. With a maximum discharge capacity of 875 cubic feet per second, this dam ensures the safety and stability of the downstream communities and ecosystems.
With its strategic location and efficient design, John Carr Jr. No. 4 stands as a testament to effective water resource management practices in South Dakota. As climate change continues to impact water availability and extreme weather events, structures like this play a vital role in safeguarding communities and promoting sustainable water use in the face of a changing climate.
Year Completed |
1972 |
Dam Length |
400 |
Dam Height |
25 |
River Or Stream |
TRIB-PINE CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
25 |
Nid Storage |
30 |
Hazard Potential |
Low |
Nid Height |
25 |
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.
John Carr Jr. No. 4