Poore Lake Reservoir Reservoir Report

Last Updated: December 5, 2025

Poore Lake Reservoir, located in Mono County, California, is a privately-owned water storage facility with a primary purpose of water supply for irrigation and domestic use.


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Summary

The reservoir was completed in 1900 and has a storage capacity of 1,200 acre-feet, serving as a vital resource for the surrounding area. Poore Lake Reservoir is situated along Poore Creek and covers a surface area of 94 acres, providing a reliable source of water in a region known for its arid climate.

The dam at Poore Lake Reservoir is an earth-fill structure with a height of 23 feet and a hydraulic height of 18 feet. Despite being classified as having a low hazard potential, the dam is regularly inspected and maintained to ensure its structural integrity. The condition assessment conducted in September 2017 deemed the reservoir to be in satisfactory condition, reassuring stakeholders of its safety and reliability. With the State of California regulating its operation and maintenance, Poore Lake Reservoir remains a crucial asset in the management of water resources within the region.

Located in the city of Walker and overseen by the California Department of Water Resources, Poore Lake Reservoir plays a significant role in supporting agricultural activities and meeting the water needs of the local community. With a history that dates back over a century, this reservoir stands as a testament to effective water resource management and highlights the importance of maintaining infrastructure to ensure a sustainable water supply in the face of changing climate conditions.

Year Completed

1900

Dam Length

400

Dam Height

23

River Or Stream

Poore Creek

Primary Dam Type

Earth

Surface Area

94

Hydraulic Height

18

Drainage Area

2.69

Nid Storage

1200

Hazard Potential

Low

Nid Height

23
       
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.