Harlem Water Supply Reservoir Report
Last Updated: December 6, 2025
The Harlem Water Supply in Montana serves as a critical resource for the local community, drawing water from the Milk River to provide essential supplies for residents.
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Summary
Owned and regulated by the local government, this earth dam stands at a height of 8 feet and was completed in 1960, offering a storage capacity of 68 acre-feet.
With a low hazard potential and a condition assessment of "Not Rated," the Harlem Water Supply is a reliable source of water for the region. While not currently inspected or rated, the dam maintains a normal storage capacity of 58 acre-feet and plays a vital role in water supply management for the area. Located in Blaine County, Montana, this essential infrastructure serves as a lifeline for the residents of Harlem.
Despite its modest size, the Harlem Water Supply is a crucial component of the local water supply system, ensuring a sustainable and reliable source of water for the community. With state oversight and regulatory agencies such as DNRC in place, the dam continues to provide essential services while maintaining a low risk profile. As water resource and climate enthusiasts, the Harlem Water Supply stands as a testament to the importance of responsible water management and infrastructure development in ensuring the well-being of local communities.
Year Completed |
1960 |
Dam Length |
1400 |
Dam Height |
8 |
River Or Stream |
PUMPED FROM MILK RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
6 |
Nid Storage |
68 |
Hazard Potential |
Low |
Nid Height |
8 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Milk River Near Harlem Mt
|
69cfs |
Peoples Creek Near Hays Mt
|
4cfs |
Battle Creek Near Chinook Mt
|
12cfs |
Milk River Near Dodson Mt
|
68cfs |
Clear Creek Near Chinook Mt
|
21cfs |
Milk River At Havre Mt
|
42cfs |
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.
Harlem Water Supply