Carr John Jr. No. 1 Reservoir Report
Last Updated: December 8, 2025
Carr John Jr.
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Summary
No. 1 is a privately owned dam located in Mellette, South Dakota, on a tributary of Pine Creek. Built in 1961, this earth dam stands at 26 feet high and has a storage capacity of 37 acre-feet. With a low hazard potential and a condition assessment that is currently not rated, this dam plays a crucial role in water resource management in the area.
Managed by the South Dakota Department of Environment and Natural Resources (DENR), Carr John Jr. No. 1 is subject to state regulations, inspections, and enforcement. The dam has a maximum discharge capacity of 625 cubic feet per second and a normal storage level of 25 acre-feet. While the dam has not been rated for its condition, its low hazard potential indicates that it poses minimal risk to surrounding communities.
Overall, Carr John Jr. No. 1 serves as an important infrastructure for water storage and management in South Dakota. With its strategic location and state oversight, this dam contributes to the protection of local water resources and helps mitigate potential flooding events in the region. For water resource and climate enthusiasts, this dam represents a significant piece of infrastructure that plays a crucial role in maintaining the balance of water ecosystems in the area.
Year Completed |
1961 |
Dam Length |
390 |
Dam Height |
26 |
River Or Stream |
TRIB. PINE CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
26 |
Nid Storage |
37 |
Hazard Potential |
Low |
Nid Height |
26 |
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. 1