Jenson Dam Reservoir Report
Nearby: Morris Jensen Marlo Johnson
Last Updated: December 6, 2025
Jenson Dam, located in Perkins, South Dakota, is a private dam with a primary purpose that is not specified in the data.
°F
°F
mph
Wind
%
Humidity
Summary
Completed in 1934, this earth dam stands at a height of 29 feet and has a length of 600 feet. With a maximum storage capacity of 500 acre-feet and a normal storage capacity of 360 acre-feet, Jenson Dam plays a crucial role in water resource management in the area.
The dam is regulated by the South Dakota Department of Environment and Natural Resources (DENR) and is subject to state jurisdiction, permitting, inspection, and enforcement. Despite being classified as having a low hazard potential, the dam's condition assessment is labeled as "Not Rated," indicating a need for further evaluation. The dam has a maximum discharge rate of 670 cubic feet per second and serves the TR-GRAND river or stream.
With its historical significance dating back to the 1930s, Jenson Dam remains an important structure for water resource management in South Dakota. As climate change continues to impact water availability and quality, monitoring and maintaining the integrity of such dams are essential for ensuring the safety and sustainability of water resources in the region.
Year Completed |
1934 |
Dam Length |
600 |
Dam Height |
29 |
River Or Stream |
TR-GRAND |
Primary Dam Type |
Earth |
Hydraulic Height |
29 |
Nid Storage |
500 |
Hazard Potential |
Low |
Nid Height |
29 |
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.
Jenson Dam