Devil’s Gate Reservoir Maintenance Completed Ahead of Forecasted El Niño Storm Season

The Los Angeles County Department of Public Works said it has completed the second annual maintenance program for Devil’s Gate Reservoir in Pasadena. 

This year’s maintenance saw the removal of 90,000 cubic yards of sediment, equivalent to more than 27 Olympic pools, ensuring the reservoir’s preparedness for the forecasted El Nin?o 2023-2024 storm season.

“Due to the impacts of climate change, such as weather whiplash and wildfires, regular maintenance of our local dams, like Devil’s Gate, is critical,” Mark Pestrella, L.A. County Public Works Director, said. “Providing flood protection and ensuring the safety of County residents is our priority.”

The maintenance operations included the clearance of excess debris within the reservoir’s basin, allowing controlled water releases when necessary while reducing flood risk.

The county also hydroseeded up to seven acres of side-slopes with native plants to alleviate erosion and dust. Dust mitigation measures will continue to be deployed in the surrounding communities during high wind events.

The Restoration Project, initiated in response to the devastating 2009 Station Fire, was designed to remove more than 1.3 million cubic yards of excess sediment in order to keep the 104-year-old dam operational, while ensuring the safety of downstream residents and businesses.

In addition to the maintenance program, ongoing habitat restoration has rehabilitated 70 acres of wetlands and riparian habitat for wildlife and recreation. Over 100 active bird nests were documented in 2023, representing more than 25 native bird species, including species on the “California Species of Special Concern” list. 

The Public Works Department said they’ve also planted up to 33,000 container plants, native stakes, and 200 oak tree acorns to create new vegetation cover and multi-structured nesting habitats in the Hahamongna Watershed Park.

“Devil’s Gate Dam serves a critical role in flood control, protecting residents during high-volume stormflow events,” the announcement said. “The County is dedicated to the ongoing safety of the reservoir and the communities it serves through partnership, strategic maintenance, and the preservation of natural habitat.” 

For more information on the Devil’s Gate Reservoir, visit devilsgateproject.com. To find tips and resources for storm readiness, visit WaterForLA.com.