Hubbard Reservoir Report
Last Updated: December 14, 2025
Hubbard is a federal-owned irrigation dam located in Nampa, Idaho, with a primary purpose of providing water for agricultural irrigation.
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Summary
Completed in 1902, this earth dam stands at a height of 23 feet and has a storage capacity of 4060 acre-feet. It is regulated by the Bureau of Reclamation and falls under the jurisdiction of the Idaho Department of Water Resources, with regular inspections and enforcement to ensure its safety and functionality.
Situated on Mason Creek, a tributary of the Boise River and Snake River, Hubbard Dam plays a crucial role in water management for the surrounding area. With a low hazard potential and a condition assessment that is currently not available, the dam is equipped with spillways for excess water discharge and operates under the supervision of the Bureau of Reclamation. Although it has not undergone any modifications in recent years, Hubbard Dam remains a key infrastructure for sustaining agriculture and water resource management in Ada County, Idaho.
Overall, Hubbard Dam serves as a vital component of the water infrastructure in Idaho, ensuring a reliable water supply for irrigation purposes. With its long history and continued operation under federal oversight, this earth dam stands as a testament to efficient water management practices and the importance of maintaining critical infrastructure for sustainable agriculture and resource conservation in the region.
Year Completed |
1902 |
Dam Length |
6000 |
Dam Height |
23 |
River Or Stream |
MASON CREEK, BOISE RIVER SNAKE RIVER |
Primary Dam Type |
Earth |
Surface Area |
450 |
Hydraulic Height |
23 |
Drainage Area |
3 |
Nid Storage |
4060 |
Structural Height |
30 |
Hazard Potential |
Low |
Foundations |
Rock, Soil |
Nid Height |
30 |
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.
Hubbard