Summary
Completed in 1948, this earth dam structure on Shaw Coulee serves multiple purposes including fire protection, stock watering, and recreational use as a small fish pond. With a dam height of 20 feet and a storage capacity of 202 acre-feet, this reservoir plays a crucial role in the local ecosystem and community.
Located in the city of Mosby, Shaw Reservoir covers a drainage area of 5.86 square miles and has a spillway width of 150 feet for controlled water release. Despite its low hazard potential, the reservoir is regulated by the Montana Department of Natural Resources and Conservation (DNRC) with regular inspections and enforcement of safety measures in place. With a moderate risk assessment rating, Shaw Reservoir continues to be a vital resource for water supply, wildlife habitat, and recreational activities in the region.
As a key feature in the Congressional District of Montana, Shaw Reservoir is a testament to sustainable water management and conservation efforts. With its scenic surroundings and diverse wildlife, this reservoir serves as a valuable asset for the community while also highlighting the importance of maintaining and protecting our water resources in the face of changing climate conditions.
Year Completed |
1948 |
Dam Length |
400 |
Dam Height |
20 |
River Or Stream |
SHAW COULEE |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Drainage Area |
5.86 |
Nid Storage |
202 |
Hazard Potential |
Low |
Nid Height |
20 |
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.
Shaw Reservoir (Garfield)