Cinnamon #2 Reservoir Report
Nearby: Cinnamon #1 Berg
Last Updated: December 5, 2025
Cinnamon #2, also known as Cooney Dam, is a privately owned earth dam located in Wheatland County, Montana.
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Summary
Built in 1974 by the USDA NRCS, this dam serves the primary purpose of irrigation along the TR-MUD CREEK. With a height of 19 feet and a length of 500 feet, Cinnamon #2 has a storage capacity of 88 acre-feet, providing essential water resources for agricultural activities in the area.
Managed by the Montana Department of Natural Resources and Conservation (DNRC), Cinnamon #2 is classified as having a low hazard potential and is currently rated as 'Not Rated' in terms of condition assessment. The dam has not been modified since its completion and does not have an Emergency Action Plan (EAP) in place. Despite its low hazard potential, the dam plays a crucial role in water management and irrigation in the region, highlighting the importance of proper maintenance and oversight for sustainable water resource management.
Located in Ryegate, Cinnamon #2 is situated in a picturesque setting with a drainage area of 1.88 square miles. With its historic significance dating back to the 1970s, this earth dam stands as a testament to the essential role of irrigation infrastructure in supporting agricultural activities and water resource management in Montana.
Year Completed |
1974 |
Dam Length |
500 |
Dam Height |
19 |
River Or Stream |
TR-MUD CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
19 |
Drainage Area |
1.88 |
Nid Storage |
88 |
Hazard Potential |
Low |
Nid Height |
19 |
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.
Cinnamon #2