Upper Hollywood Reservoir Report

Last Updated: December 5, 2025

Upper Hollywood is a local government-owned dam in Los Angeles, California, with a primary purpose of generating hydroelectric power and providing water supply.


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Summary

Completed in 1933, this earth dam stands at a height of 87 feet and spans 368 feet in length, holding a storage capacity of 196 acre-feet. Situated on the Weid Canyon stream, Upper Hollywood is regulated by the California Department of Water Resources for safety and permitting, with regular inspections ensuring its satisfactory condition and low hazard potential.

Owned and operated by the local government, Upper Hollywood plays a vital role in harnessing hydroelectric power and maintaining water supply in the region. Despite its age, the dam has been deemed structurally sound and meets regulatory guidelines, with a history of regular inspections and maintenance. As a key infrastructure in the area, Upper Hollywood contributes to the sustainability of water resources and climate resilience, reflecting the commitment to effective water management and renewable energy production.

With a notable designer, completion date, and storage capacity, Upper Hollywood stands as a testament to the engineering ingenuity of its time and the ongoing dedication to water resource management. Its location on the Weid Canyon stream and close regulatory oversight ensure its continued functionality and safety for the surrounding community. As an essential part of the local water infrastructure, Upper Hollywood exemplifies the intersection of sustainable development, climate resilience, and renewable energy production in California.

Year Completed

1933

Dam Length

368

Dam Height

87

River Or Stream

Weid Canyon

Primary Dam Type

Earth

Surface Area

8

Hydraulic Height

81.5

Drainage Area

0.37

Nid Storage

196

Hazard Potential

Low

Nid Height

87
       
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.
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