Rollins Reservoir Report

Last Updated: December 5, 2025

Rollins is a vital water resource infrastructure in California, serving multiple purposes including hydroelectric power generation, irrigation, recreation, and water supply.


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Summary

Constructed in 1965, this earth dam stands at a towering height of 228 feet and has a storage capacity of 65,988 acre-feet. Located on the Bear River in Nevada County, Rollins plays a crucial role in managing the region's water resources and supporting various water-related activities.

Managed by the Federal Energy Regulatory Commission, Rollins Dam is regulated, inspected, and enforced to ensure its safety and functionality. With a spillway width of 100 feet and a maximum discharge of 60,000 cubic feet per second, the dam has a high hazard potential and is subject to regular inspections and risk assessments. Despite its age, Rollins Dam continues to be a key asset in California's water infrastructure, providing essential services to the surrounding communities while maintaining a moderate risk level.

Situated at the Rd 174 bridge near Combie Dam, Rollins Dam not only contributes to water supply and energy generation but also offers recreational opportunities for the public. With its scenic location and significant impact on the local ecosystem, Rollins serves as a prime example of sustainable water resource management in the face of changing climate conditions. As climate enthusiasts and water resource advocates, the data on Rollins Dam highlights the importance of investing in and maintaining critical infrastructure to ensure the resilience of water systems in the face of climate challenges.

Year Completed

1965

Dam Length

1840

Dam Height

228

River Or Stream

Bear River

Primary Dam Type

Earth

Surface Area

828

Hydraulic Height

211

Drainage Area

104

Nid Storage

65988

Structural Height

227.5

Hazard Potential

High

Foundations

Rock

Nid Height

228
       
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.