Jasper Reservoir Report
Nearby: Lost Again Br-12 Retention Dam
Last Updated: December 6, 2025
Jasper is a private dam located in Blaine, Montana, near Zurich, on TR-Fifteenmile Creek.
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Summary
Built in 1938, this earth dam stands at 21 feet tall and spans 200 feet in length, with a storage capacity of 92 acre-feet for purposes such as fire protection, stock, or a small fish pond. Although the dam is not rated for condition assessment, it has a low hazard potential and is regulated by the DNRC, with state jurisdiction and permitting in place.
Situated in Congressional District 00 of Montana, Jasper is overseen by owner types associated with private entities. The dam has not undergone recent inspections, but it is equipped for state-regulated inspections, enforcement, and permitting. With a maximum storage capacity of 92 acre-feet and a normal storage of 36 acre-feet, Jasper serves its primary purposes effectively while also being prepared for emergency situations with a low hazard potential.
For water resource and climate enthusiasts, Jasper presents an intriguing case study in dam infrastructure and management in Montana. While its condition assessment is not rated, the dam's low hazard potential and state-regulated oversight ensure its functionality for fire protection, stock, and small fish pond purposes. With a historical completion date of 1938 and a storage capacity of 92 acre-feet, Jasper offers insights into the intersection of private ownership, regulatory agencies, and the importance of maintaining dam safety and functionality in the face of changing climate conditions.
Year Completed |
1938 |
Dam Length |
200 |
Dam Height |
21 |
River Or Stream |
TR-FIFTEENMILE CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
15 |
Nid Storage |
92 |
Hazard Potential |
Low |
Nid Height |
21 |
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.
Jasper