Mulholland Reservoir Report

Last Updated: December 5, 2025

Located in Hollywood, California, the Mulholland Dam, also known as Hollywood Reservoir, stands as a testament to engineering excellence in water resource management.


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Summary

Completed in 1924, this gravity dam stands at a height of 195 feet, providing a storage capacity of 4,036 acre-feet. With a primary purpose of water supply, the dam plays a crucial role in ensuring a reliable water source for the surrounding area.

Managed by the local government and regulated by the California Department of Water Resources, the Mulholland Dam is subject to regular inspections to ensure its safety and functionality. Despite its high hazard potential, the dam has been assessed to be in satisfactory condition, with emergency action plans in place to address any potential risks. The dam's location on the Weid Canyon river stream further underscores its importance in water resource management for the region.

With a surface area of 82 acres and a drainage area of 1 square mile, the Mulholland Dam serves as a vital component in the water supply infrastructure of Los Angeles County. As climate change continues to impact water resources, the significance of well-maintained structures like the Mulholland Dam becomes increasingly evident in ensuring the resilience of water supply systems in the face of changing environmental conditions.

Year Completed

1924

Dam Length

933

Dam Height

195

River Or Stream

Weid Canyon

Primary Dam Type

Gravity

Surface Area

82

Hydraulic Height

160

Drainage Area

1

Nid Storage

4036

Hazard Potential

High

Nid Height

195
       
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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