T. Holzwarth Reservoir Report
Nearby: Ralph Holzwarth Holzwarth Dam
Last Updated: December 12, 2025
T.
°F
°F
mph
Wind
%
Humidity
Summary
Holzwarth is a private earth dam located in Potter, South Dakota, completed in 1951 with a height of 20 feet and a length of 510 feet. This dam has a maximum storage capacity of 120 acre-feet and a normal storage capacity of 68 acre-feet. It 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.
Despite being rated as having a low hazard potential, the condition assessment of T. Holzwarth is currently listed as 'Not Rated', indicating a need for further evaluation. Emergency action plans, risk assessments, and inundation maps are all reported as not being prepared or updated for this dam. With no associated structures and no prior modifications, T. Holzwarth stands as a modest yet essential component of water resource management in South Dakota.
For water resource and climate enthusiasts, T. Holzwarth offers an intriguing case study in the management and regulation of private dams. Its relatively small size and low hazard potential make it a noteworthy example of the diverse array of water infrastructure present in the United States. As discussions around dam safety and climate resiliency continue to evolve, T. Holzwarth serves as a reminder of the importance of ongoing monitoring and maintenance to ensure the safety and security of our water resources.
Year Completed |
1951 |
Dam Length |
510 |
Dam Height |
20 |
River Or Stream |
TR-MISSONot RatedI |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Nid Storage |
120 |
Hazard Potential |
Low |
Nid Height |
20 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Moreau R Near Whitehorse Sd
|
35cfs |
Oak Cr Near Wakpala Sd
|
10cfs |
Bad R Near Fort Pierre Sd
|
7cfs |
Grand R At Little Eagle Sd
|
47cfs |
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.
T. Holzwarth