Swanzy Lake Reservoir Report

Last Updated: December 5, 2025

Swanzy Lake, located in Vallejo, California, is a local government-owned reservoir that serves as a crucial water supply for irrigation and domestic use in the region.


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Summary

Completed in 1931, this earth dam has a height of 86 feet and a storage capacity of 107 acre-feet, making it a significant water resource for the community. The dam sits on the Tr Carquinez Str river and is regulated by the California Department of Water Resources for safety and inspection.

With a surface area of 4 acres and a drainage area of 0.1 square miles, Swanzy Lake plays a vital role in managing water resources in Solano County. Despite its high hazard potential, the dam's condition is assessed as satisfactory, with regular inspections to ensure its stability and safety. The emergency action plan for the reservoir was last revised in 2017, demonstrating a commitment to preparedness and risk management in the face of potential hazards.

For water resource and climate enthusiasts, Swanzy Lake stands as a testament to the careful management and regulation of water infrastructure in California. As a key source of water supply for the region, this reservoir highlights the importance of maintaining and monitoring dams to ensure the safety and sustainability of water resources for future generations. The collaborative efforts between local government agencies and the Department of Water Resources exemplify a commitment to responsible water management in the face of changing climate conditions.

Year Completed

1931

Dam Length

375

Dam Height

86

River Or Stream

Tr Carquinez Str

Primary Dam Type

Earth

Surface Area

4

Hydraulic Height

82.3

Drainage Area

0.1

Nid Storage

107

Hazard Potential

High

Nid Height

86
       
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.