Dirty Wash Reservoir Reservoir Report
Nearby: Spring-Miller Claribell #8
Last Updated: December 6, 2025
Dirty Wash Reservoir, located in Garfield, Montana, serves multiple purposes including fire protection, stock watering, and as a small fish pond.
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Summary
Built in 1950, this earth dam stands at 24 feet high and has a storage capacity of 119 acre-feet, with a normal storage level of 68 acre-feet. The reservoir is regulated and inspected by the Montana Department of Natural Resources and Conservation (DNRC) to ensure safety and compliance with state regulations.
Despite its low hazard potential, Dirty Wash Reservoir plays a crucial role in providing water resources for the surrounding area. Situated along the TR-ASH Creek, this reservoir is essential for maintaining water levels for various uses, including irrigation and wildlife habitat. With its strategic location and purposeful design, Dirty Wash Reservoir stands as a testament to sustainable water management practices in the region.
As a private-owned facility, Dirty Wash Reservoir contributes to the resilience of the local community by offering reliable water sources for firefighting, livestock, and recreational fishing. With its modest size and functional design, this reservoir showcases the importance of small-scale water infrastructure in supporting diverse needs while also prioritizing environmental stewardship. For water resource and climate enthusiasts, Dirty Wash Reservoir exemplifies the intersection of water management, infrastructure development, and community resilience in the face of changing climate conditions.
Year Completed |
1950 |
Dam Length |
341 |
Dam Height |
24 |
River Or Stream |
TR-ASH CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
24 |
Nid Storage |
119 |
Hazard Potential |
Low |
Nid Height |
24 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Nelson Creek Near Van Norman Mt
|
33cfs |
Milk River At Nashua Mt
|
233cfs |
Redwater River At Circle Mt
|
4cfs |
Milk River At Tampico Mt
|
123cfs |
Missouri River Near Wolf Point Mt
|
5020cfs |
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.
Dirty Wash Reservoir