Jonas #1 Reservoir Report
Nearby: Snowfall Jensen No 3 (Dawson)
Last Updated: December 6, 2025
Jonas #1 is a private water resource located in Dawson, Montana, specifically on Berry Creek.
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Summary
Built in 1959, this earth dam stands at 25 feet high and spans 200 feet in length, providing a storage capacity of 39 acre-feet for purposes such as fire protection, stock watering, and small fish pond maintenance. The dam is regulated by the Montana Department of Natural Resources and Conservation, ensuring that it meets state inspection, enforcement, and permitting requirements.
Despite its low hazard potential, Jonas #1 has not been rated for its condition assessment and lacks emergency action plans, hazard maps, and risk assessments. The dam has not undergone recent inspections or updates to its emergency procedures. As a critical infrastructure for the surrounding area, it is important for stakeholders to address these gaps in preparedness to ensure the safety and longevity of Jonas #1 for both water resource and climate enthusiasts who rely on its services.
Year Completed |
1959 |
Dam Length |
200 |
Dam Height |
25 |
River Or Stream |
BERRY CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
25 |
Nid Storage |
39 |
Hazard Potential |
Low |
Nid Height |
25 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Redwater River At Circle Mt
|
1cfs |
Nelson Creek Near Van Norman Mt
|
33cfs |
Yellowstone River At Glendive Mt
|
6000cfs |
Missouri River Near Wolf Point Mt
|
5020cfs |
Poplar River Near Poplar Mt
|
28cfs |
Yellowstone River Near Sidney Mt
|
6130cfs |
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.
Jonas #1