May & Sons Reservoir Report
Nearby: Sd Noname 191 Sd Noname 192
Last Updated: December 13, 2025
May & Sons, INC.
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Summary
is a privately owned dam located in Jackson, South Dakota, along the Redwater Creek. Built in 1978, this earthen dam stands at 34 feet tall and has a storage capacity of 400 acre-feet. Despite its low hazard potential, the dam is regulated by the South Dakota Department of Environment and Natural Resources (DENR), with state permitting, inspection, and enforcement in place to ensure its safety and compliance with regulations.
The dam, managed by May & Sons, INC., plays a crucial role in flood control and water resource management in the area. With a maximum discharge capacity of 2400 cubic feet per second, the dam helps protect downstream communities from potential flooding events. Although the dam's condition is currently rated as "Not Rated," regular inspections and maintenance are carried out to ensure its continued functionality and safety.
Located within the St. Paul District of the US Army Corps of Engineers, May & Sons, INC. is an essential piece of infrastructure in the region. With a focus on water management and climate resilience, this dam serves as a vital asset for the community, highlighting the importance of private sector involvement in water resource management and infrastructure development.
Year Completed |
1978 |
Dam Length |
150 |
Dam Height |
34 |
River Or Stream |
REDWATER CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
34 |
Nid Storage |
400 |
Hazard Potential |
Low |
Nid Height |
34 |
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.
May & Sons, Inc.