Swan Reservoir Report

Last Updated: December 5, 2025

Swan is a privately owned earth dam located in California, specifically in Nevada County near Beale Air Force Base.


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Summary

Built in 1967, Swan serves primarily as a water supply source, with a storage capacity of 550 acre-feet. The dam stands at 59 feet tall with a hydraulic height of 44 feet, holding back the waters of Dry Creek and covering a surface area of 34 acres.

Despite its satisfactory condition assessment as of September 2017, Swan has been classified as having a high hazard potential, signaling the importance of regular inspections and maintenance. The dam has a history of state regulation and oversight by the Department of Water Resources, Safety of Dams division, ensuring that it meets safety standards and requirements. It is crucial for water resource and climate enthusiasts to stay informed about Swan's status and any potential risks associated with its operation.

As a key component in the local water supply infrastructure, Swan plays a vital role in supporting both recreational activities and essential water needs in the region. With its location in a high-risk area, it is imperative that stakeholders continue to monitor and manage the dam effectively to prevent any potential hazards or emergencies. Stay tuned for updates on Swan's condition and any risk management measures that may be implemented in the future.

Year Completed

1967

Dam Length

515

Dam Height

59

River Or Stream

Dry Creek

Primary Dam Type

Earth

Surface Area

34

Hydraulic Height

44

Drainage Area

4.68

Nid Storage

550

Hazard Potential

High

Nid Height

59
       
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.