Senner #1 Reservoir Report
Nearby: Ding-A-Ling Wold
Last Updated: December 7, 2025
Located in Dawson County, Montana, Senner #1 is a privately owned irrigation dam situated on TR-South Fork Lisk Creek in the city of Poplar.
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Summary
Completed in 1945, this earth dam stands at a height of 20 feet and has a storage capacity of 110 acre-feet, serving the primary purpose of irrigation. With a low hazard potential and a current condition assessment of 'Not Rated', Senner #1 is regulated by the Montana Department of Natural Resources and Conservation, with state permitting, inspection, and enforcement in place to ensure its safe operation.
The dam's design and construction fall under state jurisdiction, with DNRC overseeing its regulatory aspects. The structure has not been rated for its condition, and emergency preparedness measures such as an Emergency Action Plan (EAP) have not been documented. Despite the lack of recent inspection dates and condition assessments, Senner #1 presents a low risk potential, making it an essential component of the local water resource infrastructure. For water resource and climate enthusiasts, Senner #1 serves as a noteworthy example of a privately owned irrigation dam in Montana, contributing to agricultural water supply in the region.
Year Completed |
1945 |
Dam Length |
600 |
Dam Height |
20 |
River Or Stream |
TR-SOUTH FORK LISK CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Nid Storage |
110 |
Hazard Potential |
Low |
Nid Height |
20 |
Seasonal Comparison
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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.
Senner #1