Lake Eleanor Reservoir Report

Last Updated: December 5, 2025

Lake Eleanor, located in Moccasin, California, is a captivating multi-arch dam with a structural height of 61 feet and a length of 1260 feet.


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Summary

Completed in 1918, this dam serves as a vital water supply source with a storage capacity of 28,600 acre-feet and a surface area of 953 acres. The dam, situated on Eleanor Creek in Tuolumne County, is under state jurisdiction and regulated by the Department of Water Resources for the safety of dams.

With a high hazard potential, Lake Eleanor's condition assessment was deemed satisfactory as of September 2017. The dam has a regular inspection frequency of once per year, with the last inspection conducted in November 2020. Despite its age, Lake Eleanor continues to meet regulatory standards for water supply and hydroelectric purposes, serving as a key infrastructure for water resource management in the region. For water resource and climate enthusiasts, Lake Eleanor stands as a testament to engineering excellence and the importance of maintaining essential water infrastructure in a changing climate.

Year Completed

1918

Dam Length

1260

Dam Height

61

River Or Stream

Eleanor Creek

Primary Dam Type

Multi-Arch

Surface Area

953

Hydraulic Height

61

Drainage Area

80.4

Nid Storage

28600

Hazard Potential

High

Nid Height

61
       
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.