Jamison Lake Reservoir Report

Last Updated: December 5, 2025

Jamison Lake, located in Plumas County, California, is a captivating water resource managed by the USDA Forest Service for water supply purposes.


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Summary

Built in 1902, this Earth dam stands at a height of 15 feet and spans 160 feet in length, with a storage capacity of 300 acre-feet and a surface area of 32 acres. Despite its relatively low hazard potential and moderate risk assessment, the dam has not been rated for its condition and has not been inspected since September 2008.

Surrounded by the picturesque natural beauty of the San Francisco District, Jamison Lake offers recreational opportunities in addition to its primary function of water supply. With a normal storage capacity of 300 acre-feet and a maximum discharge of 125 cubic feet per second, this reservoir provides a vital resource for the local community while also serving as a serene retreat for water and climate enthusiasts. Although its risk assessment indicates a moderate level of risk, the dam's emergency action plan and risk management measures remain unspecified, leaving room for further evaluation and improvement to ensure its long-term safety and functionality.

As a key water infrastructure managed by the Forest Service, Jamison Lake plays an essential role in maintaining water supply and supporting recreational activities in the region. With its historical significance dating back over a century, this Earth dam continues to stand as a testament to human ingenuity and resilience in harnessing water resources for the benefit of society. As efforts to assess and manage risk associated with the dam progress, Jamison Lake remains a symbol of the delicate balance between human development and environmental stewardship in the face of evolving climate challenges.

Year Completed

1902

Dam Length

160

Dam Height

15

Primary Dam Type

Earth

Surface Area

32

Drainage Area

1.2

Nid Storage

300

Structural Height

15

Hazard Potential

Low

Nid Height

15
       
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.