Lake Sherwood Reservoir Report

Last Updated: December 5, 2025

Lake Sherwood, located in Thousand Oaks, California, is a privately owned reservoir primarily used for water supply purposes.


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Summary

With a dam height of 45 feet and a storage capacity of 2600 acre-feet, this arch-type dam was completed in 1904 and stands as a crucial water resource in Ventura County. The lake covers an area of 163 acres and is fed by the Potrero Valley Creek.

Despite its age, Lake Sherwood has undergone regular inspections and is deemed to be in satisfactory condition, with a high hazard potential. The dam is regulated by the California Department of Water Resources and undergoes regular permitting, inspection, and enforcement to ensure its safety and functionality. The surrounding area offers opportunities for irrigation, recreation, and of course, water supply.

As climate change continues to impact water resources, Lake Sherwood serves as a vital asset in the region's water management infrastructure. Its historical significance, coupled with its modern regulatory oversight, highlights the importance of maintaining and preserving such critical water sources in the face of a changing climate.

Year Completed

1904

Dam Length

350

Dam Height

45

River Or Stream

Potrero Valley Cr

Primary Dam Type

Arch

Surface Area

163

Hydraulic Height

44

Nid Storage

2600

Hazard Potential

High

Nid Height

45
       
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.