Fillenworth Reservoir #1 Reservoir Report
Nearby: Fillenworth #3 Dreyer
Last Updated: December 5, 2025
Fillenworth Reservoir #1, located in McCone, Montana, is a privately owned earth dam completed in 1938 for irrigation purposes.
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Summary
With a dam height of 17 feet and a storage capacity of 67 acre-feet, this reservoir on TR-McGuire Creek serves as a vital water resource for the surrounding agricultural community. Despite being classified as having a low hazard potential, the state of Montana regulates and inspects the dam regularly to ensure its safety and compliance with state standards.
Situated in a remote area with no nearby town, Fillenworth Reservoir #1 plays a crucial role in sustaining the local farming operations by providing water for irrigation. The dam's structural integrity and hydraulic height of 17 feet allow for efficient water storage, contributing to the overall water management efforts in the region. While the reservoir has not been rated for its condition, ongoing inspections by the state regulatory agency, DNRC, help to monitor any potential risks and ensure timely maintenance and upgrades as needed.
Owned and operated by a private entity, Fillenworth Reservoir #1 underscores the importance of sustainable water resource management in the face of changing climate patterns. As climate enthusiasts and water resource advocates, staying informed about the state of such infrastructure is crucial for understanding the challenges and opportunities in maintaining a reliable water supply for agricultural needs in Montana.
Year Completed |
1938 |
Dam Length |
220 |
Dam Height |
17 |
River Or Stream |
TR-MCGUIRE CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
17 |
Nid Storage |
67 |
Hazard Potential |
Low |
Nid Height |
17 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Nelson Creek Near Van Norman Mt
|
33cfs |
Redwater River At Circle Mt
|
4cfs |
Missouri River Near Wolf Point Mt
|
5020cfs |
Milk River At Nashua Mt
|
233cfs |
Poplar River Near Poplar Mt
|
28cfs |
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.
Fillenworth Reservoir #1