Jupiter Reservoir Report
Nearby: Venus U N Reservoir
Last Updated: December 6, 2025
Jupiter is a privately-owned Earth dam located in Chinook, Montana, with a primary purpose of providing fire protection, stock watering, and serving as a small fish pond.
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Summary
Built in 1819, the dam stands at a height of 10 feet and has a storage capacity of 147 acre-feet, with a normal storage level of 32 acre-feet. The dam is primarily regulated by the Montana Department of Natural Resources and Conservation (DNRC), with state jurisdiction, permitting, inspection, and enforcement all in place.
Despite being categorized as having a low hazard potential and being in "Not Rated" condition, Jupiter plays a crucial role in supporting the local community's water needs. It is situated in the Hill County of Montana, near the Diffused Surface Water source, and falls under the oversight of the Omaha District of the US Army Corps of Engineers. The dam has not been modified in recent years, and no specific risk assessment measures or emergency action plans have been disclosed, although the DNRC ensures that the dam meets regulatory guidelines.
Overall, Jupiter serves as a vital water resource for fire protection, livestock, and recreational fishing in the area. Its historical significance, combined with its low hazard potential and state-regulated status, underscores the importance of maintaining and monitoring this Earth dam to ensure the continued safety and reliability of its water supply functions for the local community.
Year Completed |
1819 |
Dam Length |
140 |
Dam Height |
10 |
River Or Stream |
DIFFUSED SURFACE WATER |
Primary Dam Type |
Earth |
Hydraulic Height |
10 |
Nid Storage |
147 |
Hazard Potential |
Low |
Nid Height |
10 |
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.
Jupiter