Cinnamon #1 Reservoir Report

Last Updated: December 5, 2025

Cinnamon #1 is a private earth dam located in Wheatland, Montana, along the TR-Musselshell River.


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Summary

Completed in 1972 for irrigation purposes, this dam stands at a height of 15 feet and has a storage capacity of 51 acre-feet. With a low hazard potential and a condition assessment that is not rated, Cinnamon #1 is regulated by the Montana Department of Natural Resources and Conservation (DNRC) and undergoes regular inspections, permitting, and enforcement.

Situated in Congressional District 00 of Montana, Cinnamon #1 is owned privately and is not federally funded or operated. The dam's primary purpose is irrigation, serving the local agricultural community in Shawmut. Despite its age, Cinnamon #1 has not undergone any significant modifications or improvements since its completion, reflecting its stable and well-maintained condition.

For water resource and climate enthusiasts, Cinnamon #1 offers a glimpse into the infrastructure supporting agriculture in Montana. With its location along the TR-Musselshell River and its vital role in providing irrigation water to the surrounding area, this dam serves as a crucial resource for sustaining agricultural activities in Wheatland County. As a state-regulated structure with a low hazard potential, Cinnamon #1 demonstrates the importance of proper maintenance and oversight in ensuring the safety and reliability of water infrastructure in the region.

Year Completed

1972

Dam Length

250

Dam Height

15

River Or Stream

TR-MUSSELSHELL RIVER

Primary Dam Type

Earth

Hydraulic Height

15

Nid Storage

51

Hazard Potential

Low

Nid Height

15
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.