Summit Reservoir Reservoir Report

Last Updated: December 5, 2025

Located in Vallejo, California, Summit Reservoir is a vital water supply structure owned by the local government.


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Summary

Completed in 1968, this offstream reservoir stands at a height of 124 feet and has a storage capacity of 220 acre-feet. With a surface area of 7 acres and a drainage area of 0.01 square miles, Summit Reservoir plays a crucial role in ensuring water availability in Solano County.

Managed by the California Department of Water Resources, Summit Reservoir is regulated, inspected, and enforced for safety and compliance. With a high hazard potential but a satisfactory condition assessment, this earth dam structure is designed for water supply purposes. The reservoir has a spillway width and outlet gates, with the last inspection conducted in October 2020, ensuring its operational readiness and adherence to safety protocols.

Summit Reservoir not only provides essential water resources but also serves as a key infrastructure for climate resilience in the region. With its strategic location and structural design, this reservoir exemplifies the importance of sustainable water management practices in the face of changing climate patterns.

Year Completed

1968

Dam Length

900

Dam Height

124

River Or Stream

Offstream

Primary Dam Type

Earth

Surface Area

7

Hydraulic Height

121

Drainage Area

0.01

Nid Storage

220

Hazard Potential

High

Nid Height

124
       
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.