Lagunita Reservoir Report

Last Updated: December 5, 2025

Lagunita, also known as Lake Lagunita, is a privately owned reservoir located in Palo Alto, California.


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Summary

Managed by the state regulatory agency DWR for the safety of dams, this earth dam structure serves primarily as a water supply source for irrigation, recreation, and other purposes. With a height of 16 feet and a storage capacity of 280 acre-feet, Lagunita was completed in 1900 and covers a surface area of 37 acres within a drainage area of 0.86 square miles.

Despite its small size, Lagunita has a significant impact on the local water supply and recreation opportunities in the area. The dam's high hazard potential is mitigated by regular inspections, with the last assessment conducted in January 2021, revealing a satisfactory condition. Emergency action plans are in place, and the dam meets safety guidelines, ensuring that the surrounding community remains protected in the event of any unforeseen incidents. The reservoir's proximity to an unnamed tributary to the San Francisco Bay adds to its ecological importance and showcases the interconnectedness of water resources in the region.

Lagunita's historical significance, coupled with its ongoing role in water management and recreational activities, makes it a valuable asset in the Santa Clara County landscape. As climate change continues to impact water resources, the careful regulation and maintenance of structures like Lagunita are crucial for ensuring a sustainable and resilient water supply for both current and future generations. Enthusiasts of water resources and climate action can appreciate Lagunita's unique blend of functionality, safety, and environmental stewardship in the face of evolving challenges.

Year Completed

1900

Dam Length

2500

Dam Height

16

River Or Stream

Unnamed Tributary To San Francisco Bay

Primary Dam Type

Earth

Surface Area

37

Hydraulic Height

12

Drainage Area

0.86

Nid Storage

280

Hazard Potential

High

Nid Height

16
       
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.