Weymouth Memorial Reservoir Reservoir Report

Last Updated: December 15, 2025

Located in La Verne, California, the Weymouth Memorial Reservoir is a vital public utility structure designed for water supply purposes.


°F

°F

mph

Wind

%

Humidity

Summary

Constructed in 1966, this offstream dam stands at 18 feet in height and spans 2400 feet in length, with a storage capacity of 151 acre-feet. Managed by the Department of Water Resources (DWR) and regulated by the Safety of Dams agency, the reservoir plays a crucial role in ensuring a sustainable water source for the surrounding community.

With a high hazard potential and a satisfactory condition assessment as of September 2017, the Weymouth Memorial Reservoir is regularly inspected to maintain its safety and integrity. The dam is equipped with outlet gates and has a maximum discharge capacity, although specific spillway details are not provided. The reservoir's emergency action plan (EAP) status and risk management measures remain unspecified, emphasizing the importance of ongoing monitoring and preparedness to mitigate any potential risks or emergencies.

The Weymouth Memorial Reservoir, nestled in the picturesque landscape of Los Angeles County, serves as a key component of the region's water infrastructure. As climate change continues to impact water resources, this reservoir underscores the importance of sustainable water management practices and proactive measures to safeguard against potential hazards. Enthusiasts of water resources and climate resilience will find the Weymouth Memorial Reservoir to be a fascinating example of infrastructure designed to meet the challenges of a changing environment.

Year Completed

1966

Dam Length

2400

Dam Height

18

River Or Stream

Offstream

Primary Dam Type

Other

Surface Area

8

Hydraulic Height

13

Nid Storage

151

Hazard Potential

High

Nid Height

18
       
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.