Harold #3 Reservoir Report
Nearby: Loomis, D. #2 Chuck #1
Last Updated: December 5, 2025
Harold #3, located in Garfield, Montana, is a private earth dam completed in 1940 by the USDA NRCS.
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Summary
This dam serves multiple purposes including fire protection, stock, and a small fish pond. With a height of 18 feet and a length of 200 feet, it has a storage capacity of 63 acre-feet and a drainage area of 2 square miles. The dam is situated on TR-Seven Blackfoot Creek and is regulated by the DNRC.
Despite being rated as having a low hazard potential, Harold #3 is classified as having a moderate risk level. It has a spillway width of 100 feet, capable of handling a maximum discharge of 500 cubic feet per second. The dam's condition is currently not rated, and no emergency action plan is in place. The risk management measures for this structure are not specified, indicating a need for further assessment and potential improvements to ensure its safety and functionality in the face of changing climate conditions.
Overall, Harold #3 represents an important water resource infrastructure in the region, providing essential services for fire protection, livestock, and wildlife. As climate change continues to impact water resources, it is crucial for stakeholders to monitor and maintain these structures to ensure their resilience and effectiveness in the face of evolving environmental challenges. By implementing appropriate risk management measures and emergency action plans, Harold #3 can continue to serve its intended purposes while mitigating potential hazards and safeguarding the surrounding community.
Year Completed |
1940 |
Dam Length |
200 |
Dam Height |
18 |
River Or Stream |
TR-SEVEN BLACKFOOT CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
18 |
Drainage Area |
2 |
Nid Storage |
63 |
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.
Harold #3