B Shaw #1 Reservoir Report
Nearby: Williams Coulee #2 Shaw #3
Last Updated: December 6, 2025
Located in Mosby, Montana, B Shaw #1 is a privately owned irrigation dam designed by USDA NRCS and regulated by the Montana Department of Natural Resources and Conservation.
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Summary
Completed in 1947, this earth-type dam stands at a height of 22 feet and has a storage capacity of 73 acre-feet. It is situated on the TR-Musselshell River, serving the primary purpose of irrigation in the region.
This low-hazard dam has not been rated for condition assessment and lacks emergency action plans or updated contact information. Despite having a spillway width of 200 feet and a maximum discharge capacity of 1000 cubic feet per second, B Shaw #1 does not have associated structures or inspection frequency data available. The dam's risk assessment, management measures, and inundation maps remain undisclosed, leaving room for potential vulnerability in case of emergency situations.
Water resource and climate enthusiasts may find B Shaw #1 an intriguing case study for its historical significance and operational characteristics. With its location in Petroleum County, Montana, and proximity to the Musselshell River, this dam plays a vital role in supporting agricultural activities in the area. However, the lack of updated safety protocols and risk assessment information raises concerns about the dam's resilience to potential threats and the need for enhanced emergency preparedness measures.
Year Completed |
1947 |
Dam Length |
200 |
Dam Height |
22 |
River Or Stream |
TR-MUSSELSHELL RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
22 |
Drainage Area |
0.47 |
Nid Storage |
73 |
Hazard Potential |
Low |
Nid Height |
22 |
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.
B Shaw #1