England Bros. Number 1 Reservoir Report
Nearby: Oswald No. 1 Jensen No.9
Last Updated: December 8, 2025
England Bros.
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Summary
Number 1 is a privately owned dam located in Mellette, South Dakota, along a tributary of Cottonwood Creek. Constructed in 1964 by the Natural Resources Conservation Service, this earth dam stands at a height of 26 feet and has a length of 770 feet. With a storage capacity of 114 acre-feet, the dam serves as a vital resource for water management in the area, with a maximum discharge capacity of 3360 cubic feet per second.
Despite its age, England Bros. Number 1 is classified as having a low hazard potential and has not been rated for its current condition. The dam is regulated by the South Dakota Department of Environment and Natural Resources, which oversees its permitting, inspection, and enforcement. While the dam has not been assessed for emergency action planning or risk management measures, it continues to provide essential water storage and flood control benefits for the region.
Located within the St. Paul District of the US Army Corps of Engineers, England Bros. Number 1 plays a crucial role in managing water resources in the region, ensuring a sustainable supply for agricultural and environmental needs. As climate change impacts continue to affect water availability, the dam's role in maintaining water security and mitigating flood risks becomes increasingly important for the community and ecosystem it serves.
Year Completed |
1964 |
Dam Length |
770 |
Dam Height |
26 |
River Or Stream |
TRIB OF COTTONWOOD CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
26 |
Nid Storage |
114 |
Hazard Potential |
Low |
Nid Height |
26 |
Seasonal Comparison
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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.
England Bros. Number 1