Truett Reservoir Report

Last Updated: December 5, 2025

Truett, also known as Woodridge Lake, is a private water resource located in Shingletown, California.


°F

°F

mph

Wind

%

Humidity

Summary

This dam on Ash Creek was completed in 1958 and serves multiple purposes such as irrigation, recreation, and water supply. Managed by the Natural Resources Conservation Service, Truett stands at 31 feet in height with a storage capacity of 219 acre-feet, covering a surface area of 24 acres.

Despite its age, Truett's condition assessment remains satisfactory, with the last inspection in November 2020 revealing no significant concerns. However, the dam is classified as having a high hazard potential, indicating the potential risks associated with its operation. The dam's emergency action plan was last revised in 2015, and while it meets guidelines, there is room for improvement in terms of risk management measures and inundation mapping to ensure the safety of downstream communities.

With its vital role in water supply and recreational activities, Truett serves as a crucial infrastructure in the region. Water resource and climate enthusiasts can appreciate the careful regulation and maintenance of such dams to ensure their continued functionality and safety in the face of changing environmental conditions. As the state of California experiences ongoing water challenges, the importance of maintaining and monitoring dams like Truett becomes increasingly evident in securing water resources for the future.

Year Completed

1958

Dam Length

570

Dam Height

31

River Or Stream

Ash Creek

Primary Dam Type

Earth

Surface Area

24

Hydraulic Height

26.5

Drainage Area

1.1

Nid Storage

219

Hazard Potential

High

Nid Height

31
       
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.