Tuolumne Log Pond Reservoir Report

Last Updated: December 5, 2025

Tuolumne Log Pond, located in Tuolumne, California, is a gravity dam completed in 1912 with a primary purpose of water supply.


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Summary

Situated on Turn Back Creek, this privately-owned structure stands at a height of 22 feet and has a hydraulic height of 20.5 feet, serving as a significant water resource for the surrounding area. With a storage capacity of 120 acre-feet and a surface area of 16 acres, the dam plays a crucial role in maintaining the water supply for both recreational activities and domestic use.

Managed by the California Department of Water Resources (DWR) under the Safety of Dams program, Tuolumne Log Pond is regulated, permitted, inspected, and enforced by state authorities to ensure its safety and compliance with regulations. Despite being assessed as in fair condition as of September 2017, the dam has a significant hazard potential, emphasizing the importance of regular inspections and maintenance. The dam's last inspection in February 2021 revealed no immediate concerns, but its condition and risk assessment are continually monitored to mitigate any potential hazards and ensure the safety of the surrounding community.

Representing a crucial piece of infrastructure in the region, Tuolumne Log Pond serves as a vital water supply source while also offering recreational opportunities. With its historical significance dating back over a century, the dam's role in water management and conservation underscores the importance of sustainable practices and proactive risk management measures. As climate change continues to impact water resources, the maintenance and monitoring of structures like Tuolumne Log Pond are essential in safeguarding the environment and ensuring water security for future generations.

Year Completed

1912

Dam Length

450

Dam Height

22

River Or Stream

Turn Back Creek

Primary Dam Type

Gravity

Surface Area

16

Hydraulic Height

20.5

Drainage Area

10.8

Nid Storage

120

Hazard Potential

Significant

Nid Height

22
       
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.