Bridgeport Reservoir Report

Last Updated: December 5, 2025

Bridgeport, a historic dam located in Mono County, California, stands as a vital piece of infrastructure for water supply in the region.


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Summary

Built in 1924, this earth dam on the East Walker River has a height of 63 feet and a storage capacity of 44,100 acre-feet. The dam serves multiple purposes, including irrigation, recreation, and water supply, making it a crucial resource for the community.

Despite its age, Bridgeport Dam has been well-maintained and is deemed to be in satisfactory condition, with a high hazard potential due to its location and function. The dam is regulated by the California Department of Water Resources and is subject to regular inspections and enforcement measures to ensure its safety and integrity. In the event of an emergency, an Emergency Action Plan (EAP) is in place, with the last revision dated December 2020.

With its rich history and importance in water resource management, Bridgeport Dam serves as a testament to the ingenuity and foresight of early engineers in developing infrastructure to support growing communities. As climate change continues to impact water resources, the maintenance and regulation of dams like Bridgeport will be essential in ensuring a sustainable water supply for future generations.

Year Completed

1924

Dam Length

900

Dam Height

63

River Or Stream

East Walker Rv

Primary Dam Type

Earth

Surface Area

3125

Hydraulic Height

52.7

Drainage Area

356

Nid Storage

44100

Hazard Potential

High

Nid Height

63
       
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.