18 Mg Walteria Reservoir Report

Last Updated: December 4, 2025

Located in Torrance, California, the 18 Mg Walteria dam serves as a critical water supply source for the region.


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Summary

Completed in 1987, this offstream dam stands at a height of 31 feet with a hydraulic height of 29 feet, providing a storage capacity of 58 acre-feet. With a primary purpose of water supply, this dam is regulated by the Department of Water Resources and undergoes regular inspections to ensure its structural integrity and safety.

The 18 Mg Walteria dam has a high hazard potential but is currently assessed to be in satisfactory condition as of September 2017. Despite its age, the dam continues to meet the necessary guidelines and regulations for operation. It is equipped with emergency action plans, although the details of their preparation and revision dates are not specified in the data. With its proximity to the Los Angeles District and the oversight of local government, this dam plays a crucial role in water management and climate resilience efforts in the area.

As a key part of the local water infrastructure, the 18 Mg Walteria dam underscores the importance of sustainable water resource management in the face of climate change. With its significant storage capacity and vital role in supplying water to the surrounding community, this dam represents a crucial piece of the puzzle in ensuring water security and resilience in the region. Regular inspections, adherence to state regulations, and emergency preparedness measures demonstrate a commitment to maintaining the dam's safety and functionality for the benefit of all who rely on its crucial water supply services.

Year Completed

1987

Dam Length

1287

Dam Height

31

River Or Stream

Offstream

Primary Dam Type

Other

Surface Area

2

Hydraulic Height

29

Drainage Area

0.08

Nid Storage

58

Hazard Potential

High

Nid Height

31
       
Seasonal Comparison

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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.