Mars Reservoir Report
Nearby: Mistress Leader Epiphany
Last Updated: December 6, 2025
Located in Hill, Montana, the Mars dam is a privately owned structure used for fire protection, stock, and small fish ponds.
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Summary
Completed in 1958, this earth dam stands at a height of 12 feet and has a storage capacity of 103 acre-feet. Managed by the DNRC, the dam is regulated, inspected, and enforced by the state, ensuring its safety and compliance with regulations.
The Mars dam plays a crucial role in managing diffused surface water for irrigation and agricultural purposes in the region. With a low hazard potential and a condition assessment of "Not Rated," the dam is considered to be in satisfactory condition. Although not a USACE structure, it serves as a vital resource for water management and conservation efforts in the area.
Despite its modest size and storage capacity, the Mars dam serves as a valuable asset for fire protection and supporting local agriculture. Its strategic location in Chinook, Montana, contributes to the overall water resource infrastructure in the region, highlighting the importance of such structures in addressing water scarcity and climate-related challenges.
Year Completed |
1958 |
Dam Length |
100 |
Dam Height |
12 |
River Or Stream |
DIFFUSED SURFACE WATER |
Primary Dam Type |
Earth |
Hydraulic Height |
12 |
Nid Storage |
103 |
Hazard Potential |
Low |
Nid Height |
12 |
Seasonal Comparison
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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.
Mars