B. J. Robinson Reservoir Report

Last Updated: December 5, 2025

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Summary

J. Robinson, a privately owned earthen dam located in Napa, California, serves as a crucial water supply infrastructure along the Tulocay Creek. Completed in 1957, this dam stands at a height of 46 feet with a storage capacity of 49 acre-feet. With a primary purpose of water supply for irrigation and domestic use, B. J. Robinson plays a significant role in supporting the local community's water needs.

Managed by the California Department of Water Resources and regulated by the Safety of Dams program, B. J. Robinson has a high hazard potential but maintains a satisfactory condition assessment as of September 2017. The dam's last inspection in March 2021 confirmed its structural integrity, ensuring its continued functionality and safety. Despite its age, B. J. Robinson remains a reliable water resource infrastructure in the region, contributing to the efficient management and distribution of water resources in Napa.

As a key component of the water supply system in Napa, B. J. Robinson underscores the importance of maintaining and monitoring essential infrastructure for climate resilience. With its strategic location and crucial role in water management, this dam exemplifies the intersection of water resource management and climate adaptation efforts. By upholding regulatory standards and conducting regular inspections, B. J. Robinson continues to safeguard the surrounding community from potential hazards while ensuring a sustainable water supply for years to come.

Year Completed

1957

Dam Length

700

Dam Height

46

River Or Stream

Tulocay Creek

Primary Dam Type

Earth

Surface Area

43

Hydraulic Height

40

Drainage Area

0.23

Nid Storage

49

Hazard Potential

High

Nid Height

46
       
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.