Folsom Dike 6 Reservoir Report

Last Updated: December 5, 2025

Folsom Dike 6 is a vital structure located in Folsom, California, along the American River, constructed in 1956 by the Bureau of Reclamation for flood risk reduction.


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Summary

This Federal-owned earth dam stands at a height of 40 feet, with a hydraulic height of 35 feet and a structural height of 40 feet, serving multiple purposes including hydroelectric, irrigation, recreation, and water supply. With a storage capacity of 1.12 million acre-feet and a surface area of 11,180 acres, Folsom Dike 6 plays a crucial role in managing water resources in the region.

The dam, part of a larger system of 11 associated structures, has a high hazard potential due to its location and purpose. Although the condition assessment and risk management measures are not currently available, the Bureau of Reclamation oversees inspections and operations to ensure its integrity. Despite not having a spillway, the dam has never experienced a maximum discharge event. The emergency action plan was last revised in January 2020, aligning with guidelines and reflecting the high risk associated with the structure.

Folsom Dike 6's importance in flood risk reduction and water management cannot be understated, especially in the context of climate change and increasing water variability. As a key component of the water infrastructure in Placer County, California, this earth dam serves as a testament to the ongoing efforts to balance water supply, flood protection, and environmental sustainability. With a rich history dating back to its completion in 1956, Folsom Dike 6 continues to play a crucial role in safeguarding communities and ecosystems along the American River.

Year Completed

1956

Dam Length

1460

Dam Height

40

River Or Stream

AMERICAN RIVER

Primary Dam Type

Earth

Surface Area

11180

Hydraulic Height

35

Drainage Area

1570

Nid Storage

1120000

Structural Height

40

Hazard Potential

High

Foundations

Rock

Nid Height

40
       
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.
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Area Campgrounds

Location Reservations Toilets
Folsom Dike 6BP54 Preview BP54
Folsom Dike 6BP53 Preview BP53
Folsom Dike 6BP55 Preview BP55
Folsom Dike 6BP52 Preview BP52
Folsom Dike 6BP02 Preview BP02
Folsom Dike 6BP01 Preview BP01