Twin Dam #2 Reservoir Report
Nearby: Twin Dam #1 Stellar Lake
Last Updated: December 6, 2025
Twin Dam #2, also known as Twin Dam North, is a private earth dam located in Rosebud, Montana, along Coyote Creek.
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Summary
Built in 1959 by the USDA NRCS, this irrigation dam stands at 15 feet high and has a length of 125 feet. With a maximum storage capacity of 109 acre-feet, it serves the primary purpose of irrigation, supporting agriculture in the region.
Owned and regulated by private entities with oversight from the Montana Department of Natural Resources and Conservation (DNRC), Twin Dam #2 has a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment. The dam has not undergone any recent inspections or assessments, and its emergency action plan (EAP) status is unclear. Despite these uncertainties, the dam continues to play a vital role in water resource management in the area.
Located in a picturesque setting with a rich history of supporting local agriculture, Twin Dam #2 represents a unique blend of natural beauty and human ingenuity. As a key piece of infrastructure in the region, its maintenance and safety are essential for ensuring the continued availability of water resources for irrigation and other uses. Climate and water resource enthusiasts will find Twin Dam #2 to be a fascinating example of how human intervention can shape and sustain vital ecosystems.
Year Completed |
1959 |
Dam Length |
125 |
Dam Height |
15 |
River Or Stream |
COYOTE CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
15 |
Drainage Area |
1.09 |
Nid Storage |
109 |
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.
Twin Dam #2