Bullhook Lower Diversion Reservoir Report
Nearby: Bullhook Dam Sands Lake East Dike
Last Updated: December 5, 2025
The Bullhook Lower Diversion in Loman, Montana, is a key infrastructure project owned by the local government and regulated by the Montana Department of Natural Resources and Conservation.
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Summary
Completed in 1955, this earth dam stands at a height of 77 feet and serves the primary purpose of flood risk reduction along the Bullhook Below Spillway Channel. With a maximum storage capacity of 785 acre-feet and a normal storage of 430 acre-feet, the dam plays a crucial role in managing water resources in the region.
Situated in Hill County, Montana, the Bullhook Lower Diversion is inspected every five years and has been assessed as being in satisfactory condition, with a high hazard potential. The dam's emergency action plan is regularly updated to ensure preparedness for any potential risks. Congressman Greg Gianforte represents the area in Congressional District 00, where the dam is located, highlighting the importance of this infrastructure in mitigating flood risks in the region. Enthusiasts of water resources and climate will find the Bullhook Lower Diversion to be a fascinating example of how engineering solutions can contribute to environmental resilience.
Overall, the Bullhook Lower Diversion stands as a testament to effective flood risk reduction efforts in Montana and showcases the importance of proper infrastructure management in safeguarding water resources. Climate and water resource enthusiasts will appreciate the detailed data on this structure and its role in protecting the surrounding community from potential hazards. As the dam continues to be monitored and maintained, it serves as a critical piece of infrastructure in the region's overall water management strategy.
Year Completed |
1955 |
Dam Length |
490 |
Dam Height |
77 |
River Or Stream |
BULLHOOK BELOW SPILLWAY CH |
Primary Dam Type |
Earth |
Hydraulic Height |
60 |
Nid Storage |
785 |
Hazard Potential |
High |
Nid Height |
77 |
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.
Bullhook Lower Diversion