Jonas #2 Reservoir Report
Last Updated: December 6, 2025
Jonas #2 is a privately owned earth dam located in Dawson County, Montana, specifically on TR-Corral Creek.
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Summary
Built in 1943, this dam serves multiple purposes including fire protection, stock watering, and providing a small fish pond. With a height of 14 feet and a length of 100 feet, Jonas #2 has a storage capacity of 57 acre-feet, with a normal storage level of 11 acre-feet.
Managed by the Department of Natural Resources and Conservation (DNRC) in Montana, Jonas #2 has been classified as a low hazard potential structure. Despite not having a condition assessment rating, this dam is regularly inspected, permitted, and enforced by the state regulatory agency. The dam has not been modified since its construction, indicating a stable and well-maintained structure. Water resource and climate enthusiasts will find Jonas #2 to be an interesting case study in sustainable dam management and multi-purpose water infrastructure in rural Montana.
Year Completed |
1943 |
Dam Length |
100 |
Dam Height |
14 |
River Or Stream |
TR-CORRAL CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
14 |
Nid Storage |
57 |
Hazard Potential |
Low |
Nid Height |
14 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Redwater River At Circle Mt
|
1cfs |
Yellowstone River At Glendive Mt
|
6000cfs |
Nelson Creek Near Van Norman Mt
|
33cfs |
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 #2