Upper Glasston North Dam Reservoir Report
Last Updated: December 5, 2025
Upper Glasston North Dam, also known as Lake Adam North Dam, is a privately owned structure located in Sweet Grass, Montana.
°F
°F
mph
Wind
%
Humidity
Summary
Built in 1912, this earth dam stands at a height of 20 feet and serves primarily for irrigation purposes along the Sweetgrass Canal. With a storage capacity of 1805 acre-feet, the dam presents a high hazard potential and is currently assessed as being in poor condition.
Managed by the Montana Department of Natural Resources and Conservation (DNRC), the Upper Glasston North Dam has a state-regulated status with regular inspections conducted to ensure safety and compliance. Despite its age, the dam continues to play a crucial role in water resource management in the region, although its deteriorating condition raises concerns for potential risks and the need for proactive maintenance and management strategies. For water resource and climate enthusiasts, this dam serves as a significant landmark in the local landscape and highlights the ongoing challenges of balancing water utilization for irrigation with the imperative of infrastructure safety and resilience in the face of changing climate patterns.
Year Completed |
1912 |
Dam Length |
600 |
Dam Height |
20 |
River Or Stream |
SWEETGRASS CANAL |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Nid Storage |
1805 |
Hazard Potential |
High |
Nid Height |
20 |
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.
Upper Glasston North Dam