Olie Reservoir Report
Last Updated: December 5, 2025
Olie, also known as White, is a privately owned dam located in Toole, Montana, along the Dodge Coulee river.
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Summary
Built in 1956 by the USDA NRCS, this Earth-type dam stands at 35 feet high and stretches 400 feet in length. Its primary purpose is to provide fire protection, stock watering, and serve as a small fish pond, with a storage capacity of 267 acre-feet.
With a significant hazard potential and a moderate risk assessment rating, Olie is regulated by the Montana Department of Natural Resources and Conservation (DNRC) and undergoes regular state inspections and enforcement measures. The dam features an uncontrolled spillway with a width of 60 feet and has a maximum discharge capacity of 300 cubic feet per second. Its location in a rural area near the city of Devon makes it crucial for ensuring water availability for agricultural and wildlife needs.
Despite its age, Olie remains operational and serves its intended purposes effectively. With its strategic location and importance for fire protection and water storage, this dam plays a vital role in the local ecosystem and agricultural activities in Toole County, Montana. It stands as a testament to the ongoing efforts to manage water resources and climate impacts in the region.
Year Completed |
1956 |
Dam Length |
400 |
Dam Height |
35 |
River Or Stream |
DODGE COULEE |
Primary Dam Type |
Earth |
Hydraulic Height |
35 |
Drainage Area |
2.81 |
Nid Storage |
267 |
Hazard Potential |
Significant |
Nid Height |
35 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Marias River Near Shelby Mt
|
305cfs |
Marias River Near Chester Mt
|
249cfs |
Teton River Near Dutton Mt
|
83cfs |
Cut Bank Creek At Cut Bank Mt
|
138cfs |
Lake Creek Near Power Mt
|
30cfs |
Marias River Near Loma Mt
|
335cfs |
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.
Olie