Dreyer #2 Reservoir Report
Last Updated: December 5, 2025
Dreyer #2 is a privately owned earth dam located in McCone County, Montana, along the TR-McGuire Creek.
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Summary
Built in 1964 by the USDA NRCS, this dam serves multiple purposes including fire protection, stock watering, and creating a small fish pond. With a height of 20 feet and a length of 350 feet, Dreyer #2 has a storage capacity of 57 acre-feet and a drainage area of 5.3 square miles.
Despite being classified as having a low hazard potential, Dreyer #2 is considered to have a moderate risk level, with a maximum discharge of 1500 cubic feet per second. The spillway type for this dam is uncontrolled, with a width of 150 feet. Although the condition assessment is currently listed as "Not Rated," the dam is regulated, inspected, and enforced by the Montana Department of Natural Resources Conservation (DNRC), ensuring its safety and compliance with state regulations.
For water resource and climate enthusiasts, Dreyer #2 presents an interesting case study in dam management and risk assessment. With its unique design and multiple purposes, this dam serves as a crucial water resource for the surrounding area while also facing potential challenges in terms of maintenance and safety. By learning more about Dreyer #2 and similar structures, enthusiasts can gain valuable insights into the intersection of water management, climate resilience, and infrastructure development.
Year Completed |
1964 |
Dam Length |
350 |
Dam Height |
20 |
River Or Stream |
TR-MCGUIRE CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Drainage Area |
5.3 |
Nid Storage |
57 |
Hazard Potential |
Low |
Nid Height |
20 |
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.
Dreyer #2