Canyon Lake Reservoir Report

Last Updated: December 5, 2025

Canyon Lake, located in Ravalli, Montana, is a picturesque reservoir with a primary purpose of irrigation.


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Summary

The dam, completed in 1891, stands at a height of 21 feet and has a storage capacity of 500 acre-feet, making it a vital water resource for the region. Despite its age, the dam is in satisfactory condition and is regularly inspected by the Montana Department of Natural Resources and Conservation.

The reservoir, fed by Canyon Creek, covers a surface area of 32 acres and serves as a critical water source for agricultural activities in the area. With a spillway width of 11 feet and uncontrolled spillway type, the dam has a high hazard potential but is managed effectively to mitigate any risks. The surrounding area is at a moderate risk level, according to assessments, emphasizing the importance of proper risk management measures.

Canyon Lake's scenic beauty and essential role in providing water for irrigation highlight its significance in the local community. As a regulated and inspected structure, it ensures the sustainable use of water resources while also contributing to the region's resilience against climate challenges. Enthusiasts of water resources and climate will find Canyon Lake to be a fascinating example of how infrastructure can support both human needs and environmental stewardship.

Year Completed

1891

Dam Length

400

Dam Height

21

River Or Stream

CANYON CREEK

Primary Dam Type

Rockfill

Surface Area

32

Hydraulic Height

18.5

Drainage Area

1

Nid Storage

500

Structural Height

21

Outlet Gates

Slide (sluice gate)

Hazard Potential

High

Nid Height

21
       
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.