Wallace Reservoir Report

Last Updated: December 5, 2025

Wallace is a public utility dam located in Calaveras, California, along the Tr Bear Creek.


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Summary

This earth-type dam stands at 29 feet tall and stretches for 700 feet, providing essential water supply for irrigation, recreation, and general water needs. Managed by the California State agency, the dam has a storage capacity of 410 acre-feet, serving a drainage area of 1.09 square miles.

Despite its satisfactory condition assessment, Wallace poses a significant hazard potential due to its location and design. Regular inspections are carried out to ensure its safety, with the most recent inspection dated March 8, 2021. The dam's emergency action plan and risk management measures are currently under evaluation, highlighting the importance of proactive monitoring and maintenance to mitigate potential risks to downstream communities and ecosystems.

With its critical role in water resource management in the region, Wallace stands as a testament to the careful balance between meeting water supply needs and ensuring the safety and integrity of infrastructure in the face of changing climate patterns and increasing demands. As climate change continues to impact water resources, the maintenance and regulation of dams like Wallace are crucial in safeguarding both human populations and natural environments against potential disasters.

Dam Length

700

Dam Height

29

River Or Stream

Tr Bear Creek

Primary Dam Type

Earth

Surface Area

52

Hydraulic Height

24

Drainage Area

1.09

Nid Storage

410

Hazard Potential

Significant

Nid Height

29
       
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.