Dean S #1 Reservoir Report
Nearby: Hudiburgh Voegele #1
Last Updated: December 19, 2025
Dean S #1 is a privately owned earth dam located in Poplar, Montana, along the TR-Duck Creek.
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Summary
Completed in 1943, the dam stands at 20 feet in height and stretches 300 feet in length, with a storage capacity of 52 acre-feet. The primary purposes of the dam are for fire protection, stock, and small fish pond. While it has not been rated for its condition assessment, the hazard potential is considered low.
Managed by the Montana Department of Natural Resources and Conservation (DNRC), the dam is regulated, permitted, inspected, and enforced by the state agency. Despite not having a designated emergency action plan (EAP) or updated inundation maps, the dam meets state guidelines and poses a low risk according to the available data. The location of Dean S #1 falls under the jurisdiction of Congressional District 00 in Montana, represented by Greg Gianforte (R).
Water resource and climate enthusiasts will find Dean S #1 an intriguing structure for its historical significance and functional purposes. As part of the Omaha District, the dam serves as a vital resource for the local community in terms of fire protection, livestock support, and recreational activities. While the dam's condition assessment is yet to be rated, its low hazard potential and state regulation provide assurance of its safety and stability for the surrounding area. Further research and monitoring could offer valuable insights into the dam's long-term effectiveness in water management and conservation efforts.
Year Completed |
1943 |
Dam Length |
300 |
Dam Height |
20 |
River Or Stream |
TR-DUCK CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Nid Storage |
52 |
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.
Dean S #1