Leland Reservoir Report

Last Updated: December 5, 2025

Leland Reservoir, located in Lafayette, California, is a crucial offstream water supply infrastructure owned and managed by a public utility.


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Summary

Built in 1955, this earth dam stands at a height of 41 feet and has a hydraulic height of 40.2 feet, with a storage capacity of 60 acre-feet. Despite being a relatively small reservoir with a surface area of 3 acres, it plays a significant role in providing water to the surrounding community.

Managed by the Department of Water Resources and regulated by the Safety of Dams agency, Leland Reservoir is deemed to have high hazard potential but is currently in a satisfactory condition as of the last assessment in 2017. Regular inspections ensure the safety and maintenance of the dam, with the most recent inspection conducted in March 2021. With its primary purpose being water supply, Leland Reservoir serves as a vital resource for the region, highlighting the importance of sustainable water management practices in the face of climate change challenges.

As climate enthusiasts and water resource advocates continue to monitor the impact of changing environmental conditions, the role of infrastructure like Leland Reservoir becomes increasingly crucial in ensuring water security for communities. With its regulated status, regular inspections, and emergency preparedness measures, Leland stands as a testament to the dedication towards maintaining critical water resources in the face of evolving climate challenges.

Year Completed

1955

Dam Length

945

Dam Height

41

River Or Stream

Offstream

Primary Dam Type

Earth

Surface Area

3

Hydraulic Height

40.2

Nid Storage

60

Hazard Potential

High

Nid Height

41
       
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.