Wilson #1 (Toole) Reservoir Report
Nearby: Wilson #2 (Toole) German Reservoir
Last Updated: December 5, 2025
Wilson #1 (Toole) is a private dam located in Toole, Montana, along the TR-MARIAS river.
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Summary
Built in 1935, this earth dam stands at a height of 20 feet and has a storage capacity of 62 acre-feet. Its primary purpose is for water supply, serving the local community and agricultural needs in the area.
Managed by the Montana Department of Natural Resources and Conservation (DNRC), Wilson #1 is regulated, inspected, and enforced by the state agency to ensure its safe operation. With a low hazard potential and a condition assessment of "Not Rated," the dam poses minimal risk to the surrounding environment and population. Although its emergency action plan and risk management measures are not specified, the dam has not been modified in recent years and remains structurally sound.
Even though Wilson #1 has not been rated for its condition assessment, its low hazard potential and state-regulated status indicate a well-maintained and safe water resource infrastructure. With its historical significance dating back to the 1930s, this dam continues to play a vital role in providing water supply to the local community in Toole, Montana. For water resource and climate enthusiasts, Wilson #1 serves as a testament to the importance of sustainable water management practices in ensuring the resilience of our infrastructure in the face of changing environmental conditions.
Year Completed |
1935 |
Dam Length |
280 |
Dam Height |
20 |
River Or Stream |
TR-MARIAS |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Nid Storage |
62 |
Hazard Potential |
Low |
Nid Height |
20 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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.
Wilson #1 (Toole)