Gollaher #2 Reservoir Report
Nearby: Missouri Bird Gollaher Reservoir
Last Updated: December 5, 2025
Gollaher #2, located in Cascade, Montana, is a privately owned earth dam constructed in 1930 for the primary purpose of water supply.
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Summary
The dam stands at a height of 18 feet and has a storage capacity of 71 acre-feet. Situated on the TR-BIRD CREEK, this structure plays a crucial role in providing water resources to the surrounding area, particularly in the city of ULM.
Managed by the Montana Department of Natural Resources and Conservation (DNRC), Gollaher #2 is subject to state regulation, inspection, and enforcement to ensure its safety and functionality. With a low hazard potential and a condition assessment of "Not Rated," this dam serves as a vital component of the local water infrastructure. Despite not being federally owned or funded, Gollaher #2 plays a significant role in water management in the region.
As a key element in the water supply system of Cascade County, Gollaher #2 contributes to the overall water security and resilience of the area. With its modest height and storage capacity, this earth dam serves as a reliable source of water for agricultural, industrial, and domestic purposes. The dam's presence underscores the importance of sustainable water resource management in the face of changing climate patterns and increasing water demands.
Year Completed |
1930 |
Dam Length |
300 |
Dam Height |
18 |
River Or Stream |
TR-BIRD CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
18 |
Nid Storage |
71 |
Hazard Potential |
Low |
Nid Height |
18 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Missouri River At Cascade Mt
|
3090cfs |
Smith River Near Eden Mt
|
119cfs |
Missouri River Near Ulm Mt
|
3160cfs |
Sun River Near Vaughn Mt
|
2680cfs |
Muddy Creek At Vaughn Mt
|
86cfs |
Sun River At Simms Mt
|
1620cfs |
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.
Gollaher #2