Devil's Gate Reservoir Restoration Project

The planned four-year effort to remove 1.7 million cubic yards of sediment from the Devil's Gate Reservoir concluded on August 10, 2021. Factors contributing to the project concluding earlier than originally planned included efficient sediment removal and favorable weather conditions.

The Devil's Gate Reservoir Restoration Project began in December 2018. The project was designed to restore the facility's flood control capacity to protect communities downstream, while establishing a permanent maintenance area and restoring native habitat in the surrounding 70 acres.

Los Angeles County Public Works would like to thank the local residents, the Community Advisory Committee, local stakeholders, neighbors and businesses in the communities of Altadena, La Cañada, Pasadena and Sun Valley for their continued collaboration and patience through to the completion of this project.

Public Works team members will continue to perform finishing construction activities within the reservoir through November of this year. The habitat enhancement component of the project will continue though fall 2022.

For more information on the full range of enhancements at Devil’s Gate Reservoir, visit the website at You can also ask questions or share your concerns at or call the Devil’s Gate Project Hotline at (626) 458-2507.

For more information on the project, consult the resources listed below:



Archived Documents:


Archive of Past News on the Project:

“Regulators crackdown on illegal emissions control systems”

  • Why diesel trucks aren’t required to get smog checks. Date = July 24, 2017

  • Recall announced by EPA in July, 2018 about 500,000 PM filter units being recalled.