Finnon Lake Reservoir Report

Last Updated: December 5, 2025

Finnon Lake, located in El Dorado County, California, is a significant water resource for the region, serving as a vital water supply source.


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Summary

The dam at Finnon Lake, completed in 2012, stands at a height of 46 feet and has a storage capacity of 400 acre-feet. With a surface area of 35 acres and a drainage area of 0.27 square miles, Finnon Lake plays a crucial role in providing water for both recreational activities and domestic use.

Managed by a public utility, the dam at Finnon Lake is regulated by the Department of Water Resources (DWR) under the Safety of Dams program. The dam has been assessed as being in satisfactory condition, with a significant hazard potential. Regular inspections are conducted to ensure its structural integrity and safety. The surrounding area, including the Jay Bird Creek and the city of Coloma, benefits from the water supplied by Finnon Lake, contributing to the overall water resource management in the region.

Visitors to Finnon Lake can enjoy a range of recreational activities in addition to appreciating its role as a vital water supply source. The lake's serene surroundings and ample water storage capacity make it a valuable asset for both water resource and climate enthusiasts. With its strategic location and essential functions, Finnon Lake stands as a testament to the importance of sustainable water management practices in ensuring the well-being of communities and ecosystems in the area.

Year Completed

2012

Dam Length

830

Dam Height

46

River Or Stream

Jay Bird Creek

Primary Dam Type

Earth

Surface Area

35

Hydraulic Height

41

Drainage Area

0.27

Nid Storage

400

Hazard Potential

Significant

Nid Height

46
       
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.