Grant Company 2 Reservoir Report

Last Updated: December 5, 2025

Grant Company 2, also known as Grant Lake, is a significant water resource located in San Jose, California.


°F

°F

mph

Wind

%

Humidity

Summary

Owned by the local government, this dam on the Arroyo Aguague river serves the primary purpose of water supply for irrigation and other uses. Constructed in 1927, the earth dam stands at a height of 27 feet and has a storage capacity of 400 acre-feet, with a surface area of 38 acres and a drainage area of 0.58 square miles.

Managed by the Department of Water Resources and subject to state regulation, Grant Company 2 has a significant hazard potential but is currently in a satisfactory condition, as assessed in September 2017. The dam is regularly inspected, with the last inspection in December 2020, and meets state permitting and inspection requirements. With its historical significance and vital role in water supply, Grant Company 2 remains a key infrastructure for the community of San Jose and the surrounding area, ensuring a reliable water source for agricultural and municipal needs.

Despite its age, Grant Company 2 continues to provide essential water resources for the region, supported by the Natural Resources Conservation Service in its design and construction. As part of the Sacramento District, the dam contributes to water supply reliability and plays a crucial role in managing the local water resources. With its location in the Santa Clara County, Grant Company 2 stands as a testament to the importance of sustainable water management and the ongoing efforts to ensure the safety and efficiency of our water infrastructure in the face of changing climate conditions.

Year Completed

1927

Dam Length

80

Dam Height

27

River Or Stream

Arroyo Aguague

Primary Dam Type

Earth

Surface Area

38

Hydraulic Height

20.5

Drainage Area

0.58

Nid Storage

400

Hazard Potential

Significant

Nid Height

27
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.