Don #1 Reservoir Report
Nearby: Frazer Dubbe Reservoir
Last Updated: December 20, 2025
Don #1 is a private earth dam located in Valley, Montana, serving purposes such as fire protection, stock, and small fish pond.
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Summary
Completed in 1960, this dam has a height of 8 feet and a storage capacity of 70 acre-feet. Situated on the TR-MISSOURI RIVER, Don #1 is regulated by the state of Montana and is under the jurisdiction of the Department of Natural Resources and Conservation (DNRC). With a low hazard potential and a condition assessment of "Not Rated," this dam plays a crucial role in providing water resources for the local community.
Owned privately, Don #1 is an essential structure for maintaining water supply for various purposes in the area, including fire protection and agricultural use. Located in the city of OSWEGO, this dam is inspected, permitted, and regulated by the state of Montana to ensure its safety and functionality. Despite its low hazard potential, the condition of Don #1 is currently not rated, indicating the need for further assessment and maintenance to ensure its long-term reliability in the face of changing climate conditions.
As a key feature in the local water infrastructure, Don #1 provides a valuable resource for the community while also serving as a small fish pond. With a storage capacity of 70 acre-feet and a height of 8 feet, this earth dam plays a vital role in water management in Valley, Montana. Although its condition assessment is "Not Rated," ongoing inspections and regulatory oversight by the DNRC are crucial for ensuring the safety and reliability of this important water resource in the region.
Year Completed |
1960 |
Dam Length |
150 |
Dam Height |
8 |
River Or Stream |
TR-MISSOURI RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
8 |
Nid Storage |
70 |
Hazard Potential |
Low |
Nid Height |
8 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Milk River At Nashua Mt
|
233cfs |
Missouri River Near Wolf Point Mt
|
5020cfs |
Nelson Creek Near Van Norman Mt
|
33cfs |
Poplar River Near Poplar Mt
|
28cfs |
Milk River At Tampico Mt
|
123cfs |
Redwater River At Circle Mt
|
1cfs |
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.
Don #1