Cinnamon #4 Reservoir Report
Nearby: Cinnamon #3 Cinnamon #1
Last Updated: December 5, 2025
Cinnamon #4 is a privately owned dam located in Wheatland County, Montana, specifically in the city of WINNECOOK.
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Summary
Built in 1973 for irrigation purposes, this earth dam stands at a height of 30 feet and has a storage capacity of 132 acre-feet. The dam is situated on the TR-AMERICAN FORK CREEK and is under the regulatory jurisdiction of the Montana Department of Natural Resources and Conservation (DNRC).
With a low hazard potential and a current condition assessment of "Not Rated," Cinnamon #4 plays a vital role in providing water for agricultural irrigation in the region. Despite not having a designated emergency action plan (EAP) or risk assessment in place, the dam undergoes regular inspections, with its last inspection date not specified. The dam's location in a picturesque area adds to its significance as a water resource structure in the region.
Although Cinnamon #4 is not operated by the U.S. Army Corps of Engineers (USACE), its presence contributes to the overall water management infrastructure in the area. As an essential element in the local irrigation system, the dam underscores the importance of sustainable water resource management practices in the face of changing climate conditions. Its strategic location and functional design make Cinnamon #4 a key player in supporting agricultural activities in the surrounding area.
Year Completed |
1973 |
Dam Length |
200 |
Dam Height |
30 |
River Or Stream |
TR-AMERICAN FORK CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
30 |
Nid Storage |
132 |
Hazard Potential |
Low |
Nid Height |
30 |
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 #4