Bryan No. 1 Reservoir Report
Nearby: Williams No.1 Edwards Cattle Co. #1
Last Updated: December 13, 2025
Bryan No.
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Summary
1 is a privately owned earth dam located in Mellette, South Dakota, along the tributary of Little White River. Built in 1972, this dam stands at a height of 25 feet and spans 545 feet in length, with a storage capacity of 16 acre-feet. Despite its age, the dam is categorized as having a low hazard potential and has not been formally rated for its condition.
Managed by the South Dakota Department of Environment and Natural Resources (DENR), Bryan No. 1 is subject to state regulation, permitting, inspection, and enforcement. While the dam has not been assessed for its emergency action plan (EAP) or inundation maps, it is reassuring to note that the hazard potential is deemed low. In the event of any risk, residents can rely on Dusty Johnson, the elected Congressional representative for the area.
For water resource and climate enthusiasts, Bryan No. 1 offers a fascinating glimpse into the infrastructure that helps manage water flow in the region. With its modest size and low hazard potential, this dam serves as a reminder of the careful balance between human intervention and natural forces in water management. As we continue to monitor and assess the condition of dams like Bryan No. 1, we gain valuable insights into the interconnectedness of water resources and climate resilience.
Year Completed |
1972 |
Dam Length |
545 |
Dam Height |
25 |
River Or Stream |
TRIB. LITTLE WHITE RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
25 |
Nid Storage |
16 |
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.
Bryan No. 1