Jeffrey #2 Reservoir Report
Nearby: Stevens Coulee #1 Frady #1
Last Updated: December 6, 2025
Jeffrey #2 is a private irrigation dam located in Garfield, Montana, along Gibbs Creek.
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Summary
Built in 1922, this earth dam stands at 25 feet tall and stretches 475 feet in length, providing a storage capacity of 258 acre-feet for irrigation purposes. Managed by the Montana Department of Natural Resources and Conservation, this dam is regulated, inspected, and enforced by the state to ensure its safety and functionality.
Despite its age, Jeffrey #2 is considered to have a significant hazard potential and has not been rated for its current condition. The dam has not undergone any modifications or assessments in recent years, and its emergency action plan status remains unknown. With its location in a rural area with no nearby city, the dam serves as a crucial water resource for agricultural activities in the region, highlighting the importance of its maintenance and monitoring for water resource and climate enthusiasts.
While lacking certain detailed assessments and emergency preparedness measures, Jeffrey #2 stands as a testament to early 20th-century irrigation infrastructure in Montana. As water resources become increasingly vital in the face of changing climates, the proper management and upkeep of dams like Jeffrey #2 are essential to sustainably support agricultural needs and protect against potential hazards in the region.
Year Completed |
1922 |
Dam Length |
475 |
Dam Height |
25 |
River Or Stream |
GIBBS CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
25 |
Nid Storage |
258 |
Hazard Potential |
Significant |
Nid Height |
25 |
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.
Jeffrey #2