Summary
With a dam height of 12 feet and a storage capacity of 627 acre-feet, the lake serves as a crucial water source for agricultural purposes in the area. It is regulated by the Montana Department of Natural Resources and Conservation and undergoes regular inspections to ensure its safety and functionality.
Situated along TR-Cottonwood Creek, Gravelly Range Lake plays a significant role in water resource management in the region, with a drainage area of 3.49 square miles and a maximum discharge capacity of 20 cubic feet per second. The dam's spillway width of 15 feet indicates its design to handle potential overflow events, highlighting its importance in flood control and water release operations. Despite being classified as having a significant hazard potential, the lake's condition assessment is currently rated as "Not Rated," suggesting a need for further evaluation and risk management measures.
Overall, Gravelly Range Lake stands as a vital infrastructure for irrigation and water storage in the scenic Canyon Creek area, demonstrating the intersection of water resource management and climate adaptation efforts in Montana. Its historical significance and ongoing regulatory oversight underscore the importance of maintaining and enhancing such water infrastructure to meet the growing demands of agriculture and environmental conservation in the region.
Year Completed |
1964 |
Dam Length |
36 |
Dam Height |
12 |
River Or Stream |
TR-COTTONWOOD CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
12 |
Drainage Area |
3.49 |
Nid Storage |
627 |
Hazard Potential |
Significant |
Nid Height |
12 |
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.
Gravelly Range Lake