Jensen Dam Reservoir Report
Nearby: Big Bucks #16 Binions #1
Last Updated: December 6, 2025
Jensen Dam, located in Garfield County, Montana, was completed in 1950 by the USDA NRCS and serves multiple purposes including fire protection, stock, and small fish pond management.
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Summary
The earth dam stands at a height of 30 feet and spans 325 feet in length, with a storage capacity of 119 acre-feet. Situated on the TR-South Fork Woody Creek, the dam is regulated by the Montana DNRC and is under state jurisdiction for permitting, inspection, and enforcement.
Despite being classified as having a low hazard potential, Jensen Dam poses a moderate risk according to a recent assessment. With a maximum discharge capacity of 250 cubic feet per second and an uncontrolled spillway with a width of 50 feet, the dam is equipped to manage potential risks. While the condition of the dam is currently not rated, regular inspections and risk management measures are in place to ensure the safety and functionality of the structure. Enthusiasts interested in water resources and climate will find Jensen Dam to be an intriguing example of a privately owned, state-regulated dam that plays a vital role in local water management and conservation efforts.
Year Completed |
1950 |
Dam Length |
325 |
Dam Height |
30 |
River Or Stream |
TR-SOUTH FORK WOODY CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
30 |
Drainage Area |
1.13 |
Nid Storage |
119 |
Hazard Potential |
Low |
Nid Height |
30 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Nelson Creek Near Van Norman Mt
|
33cfs |
Milk River At Nashua Mt
|
233cfs |
Milk River At Tampico Mt
|
123cfs |
Redwater River At Circle Mt
|
1cfs |
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.
Jensen Dam