Roth #1 Reservoir Report
Nearby: Roth #2 Wm Knight #1
Last Updated: December 6, 2025
Roth #1 is a privately owned irrigation dam located in Phillips County, Montana, along Third Creek.
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Summary
Designed by the USDA NRCS and completed in 1950, this earth dam stands at a height of 15 feet and has a storage capacity of 78 acre-feet. With a low hazard potential and not yet rated condition assessment, Roth #1 serves primarily for irrigation purposes in the region.
Situated within Congressional District 00 of Montana, Roth #1 falls under the regulatory oversight of the DNRC, with state permitting, inspection, and enforcement in place. The dam has a spillway width of 56 feet and a maximum discharge capacity of 280 cubic feet per second. Despite not having a formal emergency action plan in place or updated hazard assessments, Roth #1 continues to provide vital water resources for agricultural activities in the area.
Water resource and climate enthusiasts will find Roth #1 to be an intriguing example of a historic irrigation structure in Montana, showcasing the intersection of agriculture, water management, and infrastructure development. As discussions around sustainable water use and climate resilience grow, understanding the role of dams like Roth #1 becomes increasingly important in ensuring the efficient and effective utilization of water resources for both current and future generations.
Year Completed |
1950 |
Dam Length |
80 |
Dam Height |
15 |
River Or Stream |
THIRD CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
15 |
Drainage Area |
1.03 |
Nid Storage |
78 |
Hazard Potential |
Low |
Nid Height |
15 |
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.
Roth #1