San Pablo Reservoir Report

Last Updated: December 5, 2025

San Pablo is a city located in Contra Costa County, California.


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Summary

The region has a rich history, with the Ohlone people being the original inhabitants. The area was later colonized by the Spanish, and the Mexican government granted land to the San Pablo Rancho. The city is situated in a hydrological basin and gets its water supply from the San Pablo Reservoir. The reservoir is also a popular recreational spot for fishing, hiking, and horseback riding. The city's water system is managed by the East Bay Municipal Utility District. The area has a Mediterranean climate with mild winters and warm summers. The region receives about 25 inches of annual rainfall and relies heavily on snowpack from the Sierra Nevada Mountains for its water supply. The primary agricultural products in the area are walnuts, grapes, and apricots. The San Pablo Bay is a vital habitat for various aquatic species and is used for recreational activities like boating and fishing.

Reservoir Details

Storage 24hr Change -0.21%
Percent of Normal 108%
Minimum 17,760.0 acre-ft
2021-09-11
Maximum 38,530.0 acre-ft
2023-03-29
Average 26,890 acre-ft
Dam_Height 170
Hydraulic_Height 156.6
Drainage_Area 32.15
Year_Completed 1920
Nid_Storage 43193
Surface_Area 854
River_Or_Stream San Pablo Creek
Dam_Length 1250
Hazard_Potential High
Primary_Dam_Type Earth
Nid_Height 170
       
Seasonal Comparison
Storage Levels
Pool Elevation Levels
Top Conserv Storage Levels
Inflow Levels

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.