Wolff Reservoir Report
Nearby: Downs, Jack Timber
Last Updated: January 11, 2026
Wolff, a privately owned earth dam located in Glendive, Montana, was completed in 1946 by the USDA NRCS for multiple purposes including fire protection, stock, and small fish pond.
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Summary
With a dam height of 30 feet and a storage capacity of 368 acre-feet, Wolff serves as a vital resource for water management in the area. The dam is regulated by the State of Montana and inspected regularly to ensure its safety and functionality.
Situated on the Timber Fork Sevenmile Creek, Wolff plays a crucial role in water resource management in Dawson County. With a low hazard potential and a condition assessment of "Not Rated," the dam is considered to be in good standing. However, with no detailed risk assessment or emergency action plan in place, there is room for improvement in terms of preparedness for potential incidents or disasters.
As a key feature in the local water infrastructure, Wolff serves as a testament to the importance of sustainable water resource management in the face of changing climate conditions. With its historical significance and ongoing role in providing essential services to the surrounding community, Wolff stands as a reminder of the importance of investing in resilient and efficient water infrastructure for the future.
Year Completed |
1946 |
Dam Length |
300 |
Dam Height |
30 |
River Or Stream |
TIMBER FORK SEVENMILE CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
30 |
Drainage Area |
23.44 |
Nid Storage |
368 |
Hazard Potential |
Low |
Nid Height |
30 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Yellowstone River At Glendive Mt
|
6000cfs |
Redwater River At Circle Mt
|
1cfs |
Beaver Creek Nr Trotters
|
0cfs |
Powder River Near Locate Mt
|
231cfs |
Yellowstone River Near Sidney Mt
|
6130cfs |
Nelson Creek Near Van Norman Mt
|
33cfs |
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.
Wolff