Antelope Reservoir Report

Last Updated: December 5, 2025

Antelope Lake, located in Plumas County, California, is a state-owned reservoir with a primary purpose of water supply.


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Summary

Built in 1964, the earth dam stands at a height of 113 feet and has a maximum storage capacity of 22,566 acre-feet. The reservoir covers a surface area of 931 acres and is fed by the Indian Creek.

Managed by the California Department of Water Resources (DWR) and Safety of Dams, Antelope Lake is subject to state regulation, permitting, inspection, and enforcement. Despite being classified as having a high hazard potential, the dam's condition was last assessed as satisfactory in September 2017. The emergency action plan for the dam was last revised in December 2020, ensuring that necessary measures are in place in case of an emergency.

With its scenic location and recreational opportunities, Antelope Lake serves as a vital water resource for the region while also providing a venue for outdoor activities. The reservoir's role in water supply and recreation highlights the importance of maintaining its infrastructure to ensure the safety and sustainability of the surrounding communities and ecosystems in the face of changing climate conditions.

Year Completed

1964

Dam Length

1320

Dam Height

113

River Or Stream

Indian Creek

Primary Dam Type

Earth

Surface Area

931

Hydraulic Height

90

Drainage Area

71

Nid Storage

22566

Hazard Potential

High

Nid Height

113
       
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.