Hook #39 Reservoir Report
Nearby: Ro Smith #1 Swart #5
Last Updated: December 6, 2025
Hook #39 is a state-owned earth dam located in Montana, specifically in the city of Thurlow within Rosebud County.
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Summary
Built in 1957, this dam serves multiple purposes including fire protection, stock, and a small fish pond. With a height of 18 feet and a length of 175 feet, Hook #39 has a storage capacity of 51 acre-feet, making it an essential resource for water management in the area.
Situated on the Box Canyon Coulee river or stream, Hook #39 falls under the regulatory jurisdiction of the Montana Department of Natural Resources and Conservation (DNRC). Despite its low hazard potential, this dam plays a crucial role in maintaining water supply and protecting against potential emergencies. With state permitting, inspection, and enforcement in place, Hook #39 is well-maintained to ensure its continued functionality for the surrounding community.
As a key infrastructure for water resource management in the region, Hook #39 not only provides essential services such as fire protection and stock watering, but also contributes to the ecological balance by serving as a small fish pond. With its strategic location and state-regulated status, this earth dam stands as a testament to Montana's commitment to sustainable water management practices and climate resilience.
Year Completed |
1957 |
Dam Length |
175 |
Dam Height |
18 |
River Or Stream |
BOX CANYON COULEE |
Primary Dam Type |
Earth |
Hydraulic Height |
18 |
Nid Storage |
51 |
Hazard Potential |
Low |
Nid Height |
18 |
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.
Hook #39