Hook #23 Reservoir Report
Nearby: Lady Bug Workman #1
Last Updated: December 6, 2025
Located in Rosebud, Montana, Hook #23 is a private earth dam built in 1935 for fire protection, stock, and small fish pond purposes.
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Summary
With a height of 16 feet and a length of 350 feet, the dam has a storage capacity of 256 acre-feet and a normal storage of 137 acre-feet. Situated on TR-South Sunday Creek, this low hazard potential structure is under the regulatory jurisdiction of the Montana Department of Natural Resources and Conservation (DNRC), with state permitting, inspection, and enforcement in place.
Although the condition of Hook #23 is currently not rated, its hazard potential is classified as low. The dam has not been modified in recent years, and there is no emergency action plan (EAP) in place. Despite these factors, the structure continues to serve its intended purposes effectively. With its location in a picturesque setting and its historical significance dating back to the 1930s, Hook #23 is a notable feature for water resource and climate enthusiasts interested in the management and conservation of Montana's water infrastructure.
Overall, Hook #23 stands as a testament to the early efforts in water resource management in Montana, providing essential services for fire protection and agricultural needs. While its condition assessment may be pending, the dam's low hazard potential and operational history make it a valuable asset in the region. As climate change continues to impact water resources, structures like Hook #23 play a vital role in supporting the local community and ecosystem, showcasing the importance of sustainable water management practices for future generations.
Year Completed |
1935 |
Dam Length |
350 |
Dam Height |
16 |
River Or Stream |
TR-SOUTH SUNDAY CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
16 |
Nid Storage |
256 |
Hazard Potential |
Low |
Nid Height |
16 |
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 #23