Runkle Reservoir Report

Last Updated: December 5, 2025

Runkle, a key flood risk reduction structure located in Ventura, California, serves as a vital component in managing water resources in the region.


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Summary

Built in 1949, this earth dam stands at a height of 41 feet and has a storage capacity of 100 acre-feet, providing crucial protection against potential flooding events. The dam, situated along Runkle Canyon, is under state regulation and inspection, ensuring its safety and effectiveness in safeguarding the surrounding areas from water-related hazards.

Managed by the local government in Simi Valley, Runkle Dam plays a critical role in mitigating flood risks in the region, with a hazard potential rated as high. Despite this, the dam is assessed to be in satisfactory condition, last inspected in September 2020. Its emergency action plan (EAP) is up to date, meeting guidelines for effective emergency response in case of any unforeseen events. With a focus on flood risk reduction, Runkle Dam stands as a testament to the importance of sustainable water resource management and climate resilience in California.

As water resource and climate enthusiasts, the data on Runkle Dam showcases the intersection of infrastructure, regulatory oversight, and emergency preparedness in safeguarding communities from potential water-related disasters. With its strategic location along Runkle Canyon and its role in flood risk reduction, Runkle Dam stands as a symbol of the ongoing efforts to manage water resources effectively in California. As we continue to navigate the challenges posed by climate change, structures like Runkle Dam play a crucial role in ensuring the safety and resilience of our water systems for future generations.

Year Completed

1949

Dam Length

250

Dam Height

41

River Or Stream

Runkle Canyon

Primary Dam Type

Earth

Surface Area

7

Hydraulic Height

31.8

Drainage Area

1.86

Nid Storage

100

Hazard Potential

High

Nid Height

41
       
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.