Quail Reservoir Report

Last Updated: December 5, 2025

Quail, also known as the Peace Valley Pipeline Intake, is a crucial water resource infrastructure in California's Los Angeles County.


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Summary

Managed by the state, this water supply structure serves the primary purpose of providing water for both hydroelectric and general water supply needs. Completed in 1981, Quail is an Earth-type dam standing at 50 feet tall, with a hydraulic height of 37 feet and a structural height of 42 feet. With a storage capacity of 8,613 acre-feet and a normal storage level of 7,440 acre-feet, Quail plays a vital role in managing water resources in the region.

Located in the city of Piru, Quail is situated along the West Branch of the CA Aqueduct. Its high hazard potential and risk assessment classification of "High (2)" underscore the importance of proper maintenance and oversight. While the condition assessment is currently listed as "Not Available," regular inspections by the Federal Energy Regulatory Commission ensure its operational integrity. With no spillway, Quail relies on its design and structural features to manage water flow effectively. The presence of associated structures or locks is not applicable, emphasizing the simplicity and efficiency of this essential water supply infrastructure.

As a key component of the water management system in the region, Quail serves as a critical link in ensuring reliable water supply and supporting hydroelectric operations. With a significant storage capacity and strategic location, it plays a vital role in meeting the water needs of the surrounding communities. Despite its high hazard potential, ongoing inspections and risk management measures by regulatory agencies help maintain the safety and effectiveness of this essential water resource infrastructure.

Year Completed

1981

Dam Length

350

Dam Height

50

River Or Stream

West Branch CA Aqueduct

Primary Dam Type

Earth

Surface Area

290

Hydraulic Height

37

Drainage Area

6.6

Nid Storage

8613

Structural Height

42

Hazard Potential

High

Nid Height

50
       
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.