Magnuson Number 1 Reservoir Report
Nearby: Louder Number 1 Chambliss Number 3
Last Updated: December 14, 2025
Magnuson Number 1 is a privately owned earth dam located in Fort Pierre, South Dakota, along the TR-Bad River.
°F
°F
mph
Wind
%
Humidity
Summary
Constructed in 1958 by the Natural Resources Conservation Service, this dam stands at a height of 27 feet and has a length of 691 feet. It has a storage capacity of 46 acre-feet and a maximum discharge rate of 1250 cubic feet per second. Despite its age, the dam is classified as having low hazard potential and is currently in a condition that has not been rated.
This dam is regulated by the South Dakota Department of Environment and Natural Resources, with state permitting, inspection, and enforcement mechanisms in place. While there are no associated structures with Magnuson Number 1, its primary purpose and specific dam types are not specified. The dam's location in a privately owned area highlights the importance of private stewardship in maintaining water resources and climate resilience. For water resource and climate enthusiasts, Magnuson Number 1 serves as a reminder of the diverse infrastructure that supports our water systems and the need for ongoing monitoring and maintenance to ensure their safety and functionality.
Year Completed |
1958 |
Dam Length |
691 |
Dam Height |
27 |
River Or Stream |
TR-BAD RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
27 |
Nid Storage |
46 |
Hazard Potential |
Low |
Nid Height |
27 |
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.
Magnuson Number 1