Waller Reservoir Report
Last Updated: December 5, 2025
Waller, located in McCone County, Montana, is a privately owned earth dam completed in 1950 for multiple purposes including fire protection, stock watering, and small fish pond storage.
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Summary
Managed by the Montana Department of Natural Resources and Conservation (DNRC), Waller stands at a height of 28 feet and has a storage capacity of 74 acre-feet. With a drainage area of 3.63 square miles and a maximum discharge of 500 cubic feet per second, Waller is a crucial structure for managing water resources in the region.
Despite being classified as a low hazard potential dam, Waller poses a moderate risk and has not been rated for its condition assessment. With an uncontrolled spillway measuring 50 feet in width and no outlet gates, the dam serves as an important component in the local watershed management system. The risk management measures for Waller are yet to be detailed, and its emergency action plan (EAP) status remains unclear. As a key structure for both water resource management and ecological conservation, Waller plays a significant role in ensuring the sustainability of the surrounding ecosystem.
In the broader context of climate change and water resource management, the maintenance and monitoring of dams like Waller are essential for mitigating the potential risks associated with extreme weather events and fluctuating water levels. With a focus on enhancing the resilience of water infrastructure in the face of climate variability, the effective regulation and inspection of dams like Waller are crucial for safeguarding both human communities and the natural environment. As advocates for sustainable water resource management, enthusiasts can appreciate the significance of structures like Waller in promoting climate adaptation and disaster preparedness in a changing world.
Year Completed |
1950 |
Dam Length |
100 |
Dam Height |
28 |
River Or Stream |
TR-NELSON CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
28 |
Drainage Area |
3.63 |
Nid Storage |
74 |
Hazard Potential |
Low |
Nid Height |
28 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Nelson Creek Near Van Norman Mt
|
33cfs |
Redwater River At Circle Mt
|
4cfs |
Missouri River Near Wolf Point Mt
|
5020cfs |
Milk River At Nashua Mt
|
233cfs |
Poplar River Near Poplar Mt
|
28cfs |
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.
Waller