Lake Leticia Reservoir Report

Last Updated: December 5, 2025

Lake Leticia, located in Napa, California, is a privately owned water resource that serves multiple purposes including irrigation, recreation, and water supply.


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Summary

Built in 1960, this Earth-type dam stands at a height of 49 feet and has a maximum storage capacity of 115 acre-feet. The dam's primary purpose is to provide water supply, with Tr Milliken Creek being its associated river or stream.

With a surface area of 14 acres and a drainage area of 0.06 square miles, Lake Leticia plays a crucial role in the region's water management system. Despite its satisfactory condition assessment, the dam is classified as having a high hazard potential. Regular inspections are conducted to ensure its safety and compliance with regulatory standards enforced by the California Department of Water Resources. Lake Leticia is not only a key water source but also a vital component in the conservation of water resources and climate adaptation efforts in the area.

Year Completed

1960

Dam Length

390

Dam Height

49

River Or Stream

Tr Milliken Cr

Primary Dam Type

Earth

Surface Area

14

Hydraulic Height

45

Drainage Area

0.06

Nid Storage

115

Hazard Potential

High

Nid Height

49
       
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.